Research on the Method of Obtaining In-situ Shear Strength Parameters of Fragile Rock Stratum
JIA Zheqiang1, WANG Dong1, REN Li2, ZHANG Guangze1, LI Jiayu1, YUAN Dong1
1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China; 2. Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, China
Abstract：Research purposes:In engineering practice, fragile rock layers that cannot be cored, such as fully / strongly weathered rock mass, broken rock mass strongly affected by structure and soft rock, are often encountered, so it is difficult to measure the strength parameters of rock layers. It is urgent to develop in-situ testing methods suitable for the mechanical parameters of such fragile and difficult to obtain cored rock layers. Research conclusions:(1) The key points of rock and soil drilling in-situ shear technology are combed. According to the pressure range and application scenario of rock and soil in-situ shear technology and equipment, the methods and steps to obtain the strength parameters of fragile strata are put forward. (2) According to the soft and hard degree of rock, weathering degree and rock fragmentation degree, the strength parameters of fragile rock stratum under different conditions are given according to the principle of low, and the applicable drilling in-situ shear technology and equipment selection suggestions are given. (3) It is applied in typical fragile rock strata such as strongly weathered granite, dolomite with joint fissure development and granite seriously affected by structure. The rock mass parameters obtained are in line with the empirical value or the range recommended by the code. (4) The research results can provide reference for the acquisition of in-situ parameters of other fragile strata.
贾哲强, 王栋, 任利, 张广泽, 李嘉雨, 袁东. 易碎岩层原位剪切强度参数获取方法研究[J]. 铁道工程学报, 2022, 39(10): 19-23.
JIA Zheqiang, WANG Dong, REN Li, ZHANG Guangze, LI Jiayu, YUAN Dong. Research on the Method of Obtaining In-situ Shear Strength Parameters of Fragile Rock Stratum. Journal of Railway Engineering Society, 2022, 39(10): 19-23.
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2022, Vol. 39 
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