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Development of water sensitivity index of loess from its mechanical properties
Engineering Geology ( IF 7.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.enggeo.2020.105918 Yanqiu Leng , Jianbing Peng , Shuo Wang , Feng Lu
Engineering Geology ( IF 7.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.enggeo.2020.105918 Yanqiu Leng , Jianbing Peng , Shuo Wang , Feng Lu
Abstract Loess is a typical soil with the characteristic of water sensitivity, and in the study of water-induced geological disasters of loess distribution areas worldwide, special attention must be paid to the influence of this sensitivity. Hence, quantitative study of the water sensitivity of loess has been a basic scientific issue of wide concern. In this study, the water sensitivity characteristics of loess in the South Jingyang Tableland of China are investigated through oedometer tests and triaxial shear tests, and the variation in the structural strength, deformation modulus, and strength parameters of intact samples with different water contents is studied. It is found that the structural yield stress, initial deformation modulus and cohesion are sensitive to the water content, i.e., decreasing in the form of a power function or an exponential function with increasing initial water content. An analysis shows that the above parameters can be used to normalize the compression curves, stress-strain curves and critical state lines of loess. According to the quantitative formula of water sensitivity in the field of petroleum exploration, a new method to assess the water sensitivity of loess by analogy is proposed, which involves the structural strength, deformation modulus and shear strength parameters in the natural and humidified states. The analysis further indicates that the water sensitivity index proposed in this paper is a reasonable, sensitive and effective way to quantify the water sensitivity of loess.
更新日期：2021-01-01
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