Request pdf improvement of clay soil by electroosmosis technique the use of electroosmosis for treatment of soft clay soils is a common ground. Oct 02, 2019 git pdf notes here you can get future notes of ground improvement techniques pdf notes with unit wise topics. Injection of fluidized material into the voids of the ground of spaces between. Experimental study on the combined application of vacuum preloading variablespacing electroosmosis to soft ground improvement open pdf. The twodimensional consolidation theory of electro osmosis j. Nov 16, 2016 electro osmosis refers to the movement of liquid in a porous material due to an applied electric field. Studies on the application of electro osmosis in ground improvement include casagrande 1948, 1983, bjerrum et al. In addition, the intermittent current technique could also improve the drainage effect of soil submitted to electro osmotic consolidation, and the combination of the two techniques has potential application in soft soil improvement. Ground improvement at great yarmouth, uk the outer harbour, great yarmouth, is currently under construction a project undertaken by a van oordbam nuttall joint venture. Electroosmosis is an electrokinetic phenomenon where water is moved through soil under the influence of an electrical field. The objective of this course is for students to understand common ground improvement methods, including densification and compaction, preloading consolidation by prefabricated vertical drains, vacuum and electro osmotic consolidation, physical and chemical stabilization, soil reinforcement and seepage and dewatering. The twodimensional consolidation theory of electroosmosis j.
Ground improvement methods, volumes i and ii, fhwa nhi06019 and fhwa nhi06020, august 2006 ground improvement methods are frequently referenced in this module. Youll have a better understanding of the concepts behind a range of ground improvement techniques, and be able to identify appropriate techniques for a range of ground and site conditions. However, the significant potential loss caused by the cracking of the soil near the electrode in the later stages of electroosmosis hinders further improvement of its efficiency. Electroosmosis was discovered independently in 1814 by the english chemist robert porrett jr. Proceedings of the institution of civil engineers ground. Git pdf notes here you can get future notes of ground improvement techniques pdf notes with unit wise topics. Ekg type 4 was used as ground reinforcement to study the effect of electroosmotic dewatering on the bond.
Since then, electroosmosis has been successfully used for soft ground improvement, slope stabilisation, dewatering of tailings and sludge, pile foundation and soil remediation 212. Analytical solution for onedimensional vertical electro. In this paper, for improving dewatering efficiency and laying a basis for the. Ground improvement techniques seminar report, ppt, pdf for. Laboratory tests on soft ground improvement by chemical. Electroosmosis is a suitable method for the consolidation of soft soil. Git complete chapter pdf notes download zone smartzworld. The application of electro osmosis eo for stabilizing soft clays is receiving more attention in geotechnical engineering.
The present study is an attempt to address this lack of information. Vacuum consolidation is used for improving soft soils by using a vacuum pump. Direct current electricity is applied from anodes steel. Experimental study on the combined application of vacuum. As shown in figure 1, for ground improvement purposes the electrodes are usually laid in vertical alignment. Pdf mathematical model of electroosmotic consolidation for. In this study, electroosmotic consolidation at a certain depth was proposed to improve the drainage and consolidation effect. Electroosmotic consolidation provides an attractive soil improvement technique, during which flow of pore water occurs from the anode toward the cathode under. Pdf ground improvement techniques pdf notes git notes.
Electro osmotic consolidation of soil electro osmotic consolidation, which was studied and applied by casagrande for the first time, is an attractive soil improvement technique for soft clay. In the case of using electro osmosis, that force is. The quality of electroosmotic improvement was enhanced by longer processing time and increased potential gradient. Improvement of clay soil by electroosmosis technique. Electroosmosis is a very effective instrument when treating heterogeneous, silt and clayrich soil. Also be aware of new and innovative ground improvement methods. First reported by reuss in 1809, the electroosmosis effect. The application of electroosmosis eo for stabilizing soft clays is receiving more attention in geotechnical engineering. Vibrocompaction increases the density of the soil by using powerful depth vibrators. The dynamic loading activation time is considered to strongly influence the performance of. Seminar announcement electroosmotic consolidation of peat. Electro osmosis damp proofing systems utter and complete fraud electro osmosis is scientific theory that is being pushed by various manufacturers as a cure for rising damp. Chapter 34 electroosmotic stabilization sciencedirect. Commonly applied in soil decontamination, electroosmosis is also being developed as a ground improvement technique.
The results demonstrated that the electro osmosis process could significantly enhance reduction of the soil water content resulting in increased soil shear strength. I have a problem with rising damp in an old wall and am wondering if electroosmosis damp proofing systems actually work to remedy this as they claim. Consolidation of peat and organic soil using electroosmosis. Electroosmosis is important for many geotechnical applications, such as improving friction pile capac. The use of electro osmosis for treatment of soft clay soils is a common ground improvement technique. In the case of using electroosmosis, that force is. Ground improvement techniques for stabilization of different. Electroosmotic consolidation has long been studied as a soft soil improvement technique. Laboratory assessment of electroosmotic stabilization of. Based on electrode alignments, the application of electroosmosis consolidation can be categorised into two general cases. The objective of this course is for students to understand common ground improvement methods, including densification and compaction, preloading consolidation by prefabricated vertical drains, vacuum and electroosmotic consolidation, physical and chemical stabilization, soil reinforcement and seepage and dewatering. Influence of dynamic loading activation time on electro. Electroosmotic consolidation is an attractive, soft ground improvement technique.
Electroosmotic consolidation is an attractive soil improvement technique for soft clay. Ground improvement techniques for stabilization of. The twodimensional consolidation theory of electroosmosis. Proceedings of the institution of civil engineers ground improvement, volume 6, issue 4, 1 jan 2002 145152 experimental study on the combined application of vacuum preloading variablespacing electroosmosis to soft ground improvement. When the application of traditional ground improvement techniques, such a. Preloading method is used to remove pore water over time. I have a problem with rising damp in an old wall and am wondering if electro osmosis damp proofing systems actually work to remedy this as they claim. As shown in figure 1, for ground improvement purposes the.
Subsidence of adjacent ground and sloughing of the lower part of a slope sloped pits may occur. Electroosmotic consolidation of soil electroosmotic consolidation, which was studied and applied by casagrande for the first time, is an attractive soil improvement technique for soft clay. Ios press ebooks using electroosmosis technique in the. Explore ground improvement techniques with free download of seminar report and ppt in pdf and doc format.
Nicholson, in soil improvement and ground modification methods, 2015. Strange that a cure, for something that barely exists, if at all. Institute of technology, savli on september 15, friday,2017 ground improvement technology. The phenomenon of electroosmosis is very useful in chemical separation techniques and buffered solutions. The achievements and major bottleneck of the current technique were briefly. Electro osmotic consolidation is an attractive, soft ground improvement technique. With a view to expanding great yarmouths port operational capabilities, the outer harbour will service a whole range of ships including freight ferries and container. Used in low permeability soils silts, silty clays, some peats when no other method is suitable. Electroosmotic consolidation, which was studied and applied by casagrande for the first time, is an attractive soil improvement technique for. Though electroosmosis has been proven to be a viable method for improvement of clay, limited studies have been carried out on the electroosmosis of peat.
Experimental study on soft soils improvement by the deep. When the application of traditional ground improvement techniques, such as surcharge, preloading, wick drains, and vacuum preloading, is not appropriate for a particular situation, innovative techniques such as electroosmosis need to be considered. Electroosmotic treatment electroosmosis displace water through porous space chemical injection localisedimprovement effects somechemicalsaretoxic and hazardous electrolyte leaching electrode decomposition experimentonmarineclay, 2006 tremendous costs associated in metal electrodes consumed. The dynamic loading activation time is considered to strongly influence the performance. Missouri university of science and technology scholars mine. An alternative method, however, is the use of electroosmosis. Pdf electroosmosis is an established method of dewatering fine soils.
Electroosmotic consolidation is an effective ground improvement technique in fine grained soils. Electroosmotic consolidation of soil the constructor. Numerical simulation of elastoplastic electroosmosis. Soil improvement by electroosmosis with vacuum drainage in. Electroosmosis is one of the several electrokinetic reactions that take place when a direct current voltage is applied across the electrodes inserted into a saturated soil. However, problems such as electrode erosion, low e. If the water table lies very close to the base of footings, the bearing capacity and settlement characteristics of the soil would be affected. Seminar announcement electroosmotic consolidation of. The use of electroosmosis for treatment of soft clay soils is a common ground improvement technique.
Performance of drainage well in electroosmotic consolidation. Improvement of clay soil by electroosmosis technique request pdf. Prev next experimental study on the combined application of vacuum preloading variable. Electroosmosis refers to the movement of liquid in a porous material due to an applied electric field. A number of chemical, physical and mechanical interactions occur during the improvement of soil by this technique. Experimental study of the electroosmotic dewatering in hangbag. School of civil engineering, henan polytechnic university, jiaozuo 454000, china. Ren lianwei 1, xiao yang 1, kong gangqiang 2, zhang minxia 1. Also explore the seminar topics paper on ground improvement techniques with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015. Performance of drainage well in electroosmotic consolidation experiment 505 5. Based on electrode alignments, the application of electro osmosis consolidation can be categorised into two general cases. Experimental study on the combined application of vacuum preloading variablespacing electroosmosis to soft ground improvement h.
An optimal anode length of twothirds of the soil depth was recommended according to the experimental results. Successful field trials have been carried out in clay, with limited research in peat and organic soil. Consolidation of peat and organic soil using electro. Electroosmosis is an established method of dewatering fine soils, sediments, and sludge sss. In this paper a theoretical model is proposed for electro osmotic consolidation by coupling the seepage field. Here we have listed different units wise downloadable links of ground improvement techniques notes where you can click to download respectively. The electroosmosis chemical treatment ect is a useful method for improving soil strength. Pdf mathematical model of electroosmotic consolidation. The phenomenon of electro osmosis is very useful in chemical separation techniques and buffered solutions. Experimental results changes in water content the initial average water contents, w iav, of the test bed with drainage at bottom and with drainage well were 554% and 630%, respectively. Experimental results changes in water content the initial average water contents, w iav, of the test bed with drainage at bottom and with drainage well were 554% and.
Pdf electroosmosis treatment techniques and their effect on. A number of chemical, physical and mechanical interactions. In this paper a theoretical model is proposed for electroosmotic consolidation by coupling the seepage field. However, the effectiveness of electroosmotic stabilization of peat has not been investigated. However, the improvement was limited by the drying of the anode area. Ground improvement techniques pdf notes git notes pdf. There is absolute evidence that during the electro osmotic treatment, the basic index, physicochemical and engineering properties of the soils was found to be modified.
Electro osmosis is a very effective instrument when treating heterogeneous, silt and clayrich soil. Though electro osmosis has been proven to be a viable method for improvement of clay, limited studies have been carried out on the electro osmosis of peat. Performance of drainage well in electro osmotic consolidation experiment 505 5. The results demonstrated that the electroosmosis process could significantly enhance reduction of the soil water content resulting in increased soil shear strength.
The sump should be preferably lined with a filter material which has. Electro osmosis is a suitable method for the consolidation of soft soil. Electro osmotic systems and prefabricated drains are applied to waterbearing finegrained soils where gravitational movement of ground water through porous rrdia is diffi cult and additional force is required to move the water. Wang analysing drivers stop and go decisions in dilemma zones at signalised intersections.
The ground can be improved by adapting certain ground improvement techniques. The electro osmotic treatment for stabilizing finegrained soils is gaining importance in the field of geotechnical engineering. Feb 22, 2016 this feature is not available right now. Enhanced engineering characteristics of soils by electro. Electroosmotic flow is caused by the coulomb force induced by an electric field on net mobile electric charge in a solution. Dynamic loading is applied to overcome this problem. Electro osmosis is one of the several electrokinetic reactions that take place when a direct current voltage is applied across the electrodes inserted into a saturated soil. The principles of electroosmosis were introduced as early as the 1930s by casagrande hausmann, 1990 and have been utilized as a method of soil stabilization for a number of different types of projects and applications since that time. Electro osmotic consolidation is an effective ground improvement technique in fine grained soils. Ground improvement techniques seminar report, ppt, pdf. In this technique, the saturated fine grain soil is consolidated by the application of electric current. Electroosmosis electroosmotic embankment engineering equipment excavation field filter flow foundation geomembranes. The principles of electro osmosis were introduced as early as the 1930s by casagrande hausmann, 1990 and have been utilized as a method of soil stabilization for a number of different types of projects and applications since that time. Laboratory tests on soft ground improvement by chemical electroosmosis method.
Sep 16, 2017 ground improvement techniques introduction 1. Electroosmosis treatment techniques and their effect on dewatering. However, the significant potential loss caused by the cracking of the soil near the electrode in the later stages of electro osmosis hinders further improvement of its efficiency. There is absolute evidence that during the electroosmotic treatment, the basic index, physicochemical and engineering properties of the soils was found to be modified. Lo 5 proved that electroosmosis can permanently reduce the brittleness index and sensitivity of soil, improve soil quality, and obtain. Key laboratory of geomechanics and embankment engineering, hohai university, ministry of education, nanjing 210098, china. The level of the water table fluctuates with season. The type of system im talking about consists of a wallmounted electromagnetic field generator and a cathode in the ground. Also explore the seminar topics paper on ground improvement techniques with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. A wide variety of ground improvement methods have been developed for economic foundation solutions on soft soils for a stateoftheart, see 15 and cited references. The electroosmotic treatment for stabilizing finegrained soils is gaining importance in the field of geotechnical engineering.
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