Abstract

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Title:: Quantitative assessment method of unsaturated soil compaction degree based on resistivity property

Author(s):: SONG Jie; LI Shu-cai; LIU Bin; XU Xin-ji; WANG Chuan-wu; NIE Li-chao; Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China

Keywords:: road engineering; compaction degree; resistivity property; quantitative assessment; electrical resistivity tomography

Abstract:: The resistivity method was introduced into the assessment of soil compaction degree to obtain deep information and distribution of soil compaction degree and to achieve large-scale evaluation. The basic model of theoretical relationship between resistivity and compaction degree was obtained through theoretical deducing based on the original resistivity model. The systematic laboratory experiment results proved that resistivity decreases at the exponent sign rule with the increase of moisture content, and revealed that resistivity decreases at the exponent sign rule with the increase of compaction degree. The definite relationship expression among resistivity, moisture content and compaction degree was also obtained. Besides, an exponent sign formula on relationship between resistivity and compaction degree was obtained under the premise of considering soil compaction technology. Using the formula, this paper proposed the quantitative assessment method and the implementation process of unsaturated soil compaction degree with resistivity property was proposed based on electrical resistivity tomography and inversion with inequality constraint. The experimental results show that the result of soil compaction degree by resistivity method is basically consistent with that by the cutting ring method, and the distribution of soil compaction degree is obtained. The method is convenient and efficient, and has a bright prospect of generalization.