Abstract
Electric field treatment is a kind of new technology that improves and reinforces soil. Proper amounts of lime and sodium sulfate were added to the soil as stabilizers. Compacted the mixture to meet the predetermined dry density and then imposed a certain intensity of electric field on it. After curing, unconfined compression tests, direct shear tests, high pressure compression tests and collapsibility tests were carried out. The results show that the engineering properties of the improved soils, such as its unconfined compressive strength, shear strength, compressibility, are better than that of the backfill compacted loess. Moreover, collapsibility under the different degree of compaction has been removed. The microstructure and improving mechanism of the improved soils are analyzed using scanning electron microscope (SEM), and the results can provide references for further study and engineering application.
Highlights
For the past few years, with the coordination development of regional economy and develop-the-west strategy, the urban scale extends continuously in north-western China, and more city constructions have been carried out
Dynamic compaction is a popular method in dealing with loess high filled ground in Yan'an new area
The formation of soil strength mainly occurred in 7 d and 14 d, the strength still improved after 21 d, the later strength of samples has been improved by the remaining part of lime (figure 1 (b))
Summary
For the past few years, with the coordination development of regional economy and develop-the-west strategy, the urban scale extends continuously in north-western China, and more city constructions (such as Zhengzhou-Xi'an high-speed railway, Lanzhou new district and Yan’ an new district) have been carried out. Dynamic compaction is a popular method in dealing with loess high filled ground in Yan'an new area. The soil engineering properties are improved and stabilized by being mixed with some chemical modified materials. The application of soil stabilizer GT was investigated to improve mollisol engineering properties [3]. The soil stabilizer EN-1 was been studied for the improvement of loess engineering properties and slope slide mechanism [5, 6]. Wang et al have studied the SH solidified loess and analyzed the influence of curing period and mixing amount on mechanical and water-physical properties. External electric field processing technique, a new chemical treatment method, is able to enhance intensity and eliminate collapsibility of compacted loess, especially when compaction degree of loess-filled highway foundation is not up to the control standard. The compacted materials were treated with a certain strength alternating-electric field
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