边坡碳质板岩原位剪切试验研究  

Study on in-situ shear tests of carbonaceous slate on slopes

作　　者：王庆阳 李振民 屈恒祥 Wang Qingyang;Li Zhenmin;Qu Hengxiang(Zhongkan Metallurgical Investigation Design and Research Institute Co.,Ltd.,Baoding 071000,China;Xi′an University of Science and Technology,Xi′an 710054,China)

机构地区：[1]中勘冶金勘察设计研究院有限责任公司,河北保定071000 [2]西安科技大学,陕西西安710054

出　　处：《能源与环保》2024年第3期86-90,97,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

摘　　要：岩石的参数是分析滑坡区稳定性状况的重要基础条件,以包钢巴润矿业滑坡区为工程背景,对主要由黑云母碳质板岩组成的松散岩体边坡进行稳定性研究。采用现场原位剪切试验、理论计算与数字图像处理技术相结合的方法,拟合原位剪切试验结果;基于最小二乘法确定现场岩体内摩擦角与黏聚力,分析原位剪切试验的节理面数字三维形貌,通过分形维数实现剪切结构面复杂程度的定量表征。结果表明,原位试验过程中,在0~1 MPa法向应力下得到的剪切应力,拟合优度为0.98;而文献[14]研究法向应力在3~14 MPa情况下的4组试验得到的剪切应力,拟合优度为0.75;剪切后的岩体在样品垂直方向120~240 mm产生剪切结构面,结构面发生剪断破坏的同时,伴随有剪胀破坏;剪切结构面形貌复杂程度较大,分形维数数值为1.68。原位剪切试验与图像形貌数学分析思路为现场岩体的物理力学参数预测与定量表征提供重要参考。Rock parameters are important basic conditions for analysing the stability conditions of landslide areas.This paper took the landslide area of Baogang Barun Mining Industry as the engineering background and conducts stability studies on the slopes of loose rock masses mainly composed of black mica carbonaceous slate,the in-situ shear test results were fitted using a combination of on-site in-situ shear test,theoretical calculation,and digital image processing technology.The friction angle and cohesion of the on-site rock mass were determined based on the least squares method.The digital three-dimensional morphology of the joint surface in the in-situ shear test was analyzed,and the complexity of the shear structural surface was quantitatively characterized through fractal dimension.The results showed that the shear stress obtained during the in-situ test at 0~1 MPa normal stress had a goodness of fit of 0.98.Reference[14]studied the shear stress obtained from four sets of experiments under normal stress of 3~14 MPa,with a goodness of fit of 0.75.The shear structural plane was generated in the rock mass between 120 and 240mm in the vertical direction of the sample,along with the occurrence of shear failure on the structural plane,there was also shear dilation failure.The complexity of the shear structure surface morphology was relatively high,with a fractal dimension value of 1.68.The idea of in-situ shear testing and mathematical analysis of image morphology provides an important reference for the prediction and quantitative characterisation of physical and mechanical parameters of rock masses in the field.

关 键 词：碳质板岩 剪切试验 分形维数 

分 类 号：TU457[建筑科学—岩土工程]