(1. College of Architecture and Civil Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Key Laboratory of Highway Construction and Maintenance Technology in Loess Region，Ministry of Transport，Shanxi Transportation Research Institute，Taiyuan，Shanxi 030006，China)
Abstract：Compression tests were performed to study the AC electrical resistivity of unsaturated loess with different stresses，strains，porosities，degree of saturations and current frequencies. Considering the inhomogeneity of micro pore distribution，the tortuosity of current flow and current frequency，an electrical resistivity model of equivalent circuit for unsaturated loess was proposed. Under different current frequencies，with the increasing of the stress and strain，the electrical resistivity decreased rapidly at first，and then remained basically unchanged after the stress exceeded 200 kPa and the strain exceeded than 0.084. With the decreasing of porosity，the electrical resistivity decreased rapidly at first，and then approached a stable value when the porosity was below 0.41. With the increasing of the degree of saturation，the electrical resistivity decreased sharply at first，and then approached a stable value when the degree of saturation was above 52.7%. The electrical resistivity of unsaturated loess was found to be closely related to its micro structure and can be divided into four stages. Under different stresses，with the increasing of current frequency，the electrical resistivity decreased rapidly at first，and then approached a stable value. In order to reduce the influence of current frequency on electrical resistivity，the range of 50 kHz–1 MHz was recommended when using AC electrical resistivity method to measure and evaluate unsaturated loess.
谢定义. 论我国黄土力学研究中的若干新趋向[J]. 岩土工程学报，2001，23(1)：3-13.(XIE Dingyi. Exploration of some new tendencies in research of loess soil mechanics[J]. Chinese Journal of Geotechnical Engineering，2001，23(1)：3-13.(in Chinese))
[3]
刘海松，倪万魁，颜 斌，等. 黄土结构强度与湿陷性的关系初探[J]. 岩土力学，2008，29(3)：722-726.(LIU Haisong，NI Wankui，YAN Bin，et al. Discussion on relationship between structural strength and collapsibility of loess[J]. Rock and Soil Mechanics，2008，29(3)：722-726.(in Chinese))
<body>Your browse does not support frame!</body>
2015, Vol. 34 
