易碎岩层原位剪切强度参数获取方法研究  

Research on the Method of Obtaining In-situ Shear Strength Parameters of Fragile Rock Stratum

作　　者：贾哲强 王栋[1] 任利 张广泽[1] 李嘉雨 袁东 JIA Zheqiang;WANG Dong;REN Li;ZHANG Guangze;LI Jiayu;YUAN Dong(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China;Key Laboratory of Deep Underground Science and Engineering,Ministry of Education,Sichuan University,Chengdu,Sichuan 610065,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]四川大学深地科学与工程教育部重点实验室,成都610065

出　　处：《铁道工程学报》2022年第10期19-23,29,共6页Journal of Railway Engineering Society

基　　金：西藏自治区科技计划重点研发计划项目(XZ202201ZY0021G);中铁二院工程集团有限责任公司科技开发项目(KSNQ200002,KDNQ212035,KDNQ213036)。

摘　　要：研究目的:工程实践中常遇到全/强风化岩体、受构造影响强烈的破碎岩体和软质岩等无法取心的易碎岩层,难以测取岩层强度参数,急需发展适合此类易碎、难取心岩层力学参数的原位测试方法。研究结论:(1)梳理了岩土体钻孔原位剪切技术要点,根据岩土体原位剪切技术及装备的压力范围和适用场景,提出了易碎岩层强度参数获取方法和步骤;(2)根据岩石软硬程度、风化程度和岩体破碎程度,按就低原则给出不同情况下易碎岩层强度参数获取适用的钻孔原位剪切技术及装备选取建议;(3)在强风化花岗岩、节理裂隙发育的白云岩以及受构造影响严重的花岗岩等典型易碎岩层中进行了应用,获取的岩体参数与经验取值或规范建议范围较为符合;(4)本研究成果可为其他易碎地层原位参数的获取提供参考。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.

关 键 词：钻孔剪切 原位测试 强风化 易碎岩体 强度参数 

分 类 号：TU45[建筑科学—岩土工程]