(1. Shaanxi Key Laboratory of Behavior and Treatment for Special Rock and Soil，China Jikan Research Institute of Engineering Investigations and Design Co.，Ltd.，Xi?an，Shaanxi 710043，China；2. College of Civil Engineering，Xi?an University of
Architecture and Technology，Xi?an，Shaanxi 710055，China；3. China United Northwest Institute for Engineering
Design and Research Co.，Ltd.，Xi?an，Shaanxi 710077，China)
Abstract：The Borehole Shear Test(BST) provides direct determination of friction angle and cohesion of soils in-situ. In recent years，BST has been gradually used to in-situ shear test for soil investigations in China. In order to reveal the deformation and strength characteristics of remolded loess by BST，the normal displacement and shear displacement observation system are added to modify the traditional BST apparatus，the model test device for BST is designed，and the influence law of shear strength parameters test results caused by the initial normal stress，normal stress increments，consolidation time and testing procedures are discussed. On this basis，the method of adjusting the test control parameters according to the shear characteristics of the tested soil layer is proposed，which can be used to guide the in-situ BSTs of loess foundation treated by cushion method and compaction method. The test results show that the normal displacement curve includes initial deformation section，quasi elastic deformation section and plastic deformation section；The shear displacement curve includes quasi elastic increasing section，plastic deformation section and shear failure section；The normal pressure applied should be controlled in the range of quasi elastic deformation section；There is no significant difference of the shear strength parameters which measured by the multi-stage testing(MT) and single-stage testing(ST)，and the measured cohesion by MT is 2.3–3.5 kPa smaller than ST，and the measured internal friction angle by MT is 0.8°–2.4° larger than ST.
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2021, Vol. 40 
