片岩高边坡力学特性及加固机理探讨

Mechanical and reinforcement mechanism of schist high slope

为研究汉十高铁十堰段沿线绢云母石英片岩高边坡的力学特性及加固机理,进行了绢云母石英片岩的XRD衍射试验、点荷载及结构面剪切试验,分析了其物质组成、影响岩体强度的主要矿物成分;探讨了不同石英含量和亲水矿物含量对岩体点荷载的各向异性指数以及结构面力学参数的影响,并通过数值模拟探讨了片岩高边坡的破坏模式和加固机理,结果表明:片岩中石英、绢云母和方解石等亲水矿物的含量直接影响岩体强度和各向异性指数,其中片岩中的石英含量是影响岩体结构面强度的首要因素,在构造作用的影响下平行于片理面的强度要大于垂直于片理面的强度;根据数值模拟结果,边坡开挖受到扰动后应力会发生变化,逆向坡的破坏模式会由倾倒破坏变为牵引式破坏,因此,在工程实践中应根据不同的坡体结构、亲水性矿物含量选取合理计算参数对边坡开展加固设计。

In this study,XRD,point load and shear test of sericite quartz schist were applied on the research of mechanical and reinforcement mechanism of schist high slope in Shiyan section of HanShi high-speed railway.The material composition and main mineral components which affect the strength of rock mass of sericite quartz schist were analyzed.With different quartz and hydrophilic mineral content on anisotropic index of rock mass point load and mechanical parameters of discontinuities were discussed,Through the numerical simulation on Failure mode and reinforcement mechanism of schist high slope,The results show that The content of hydrophilic minerals such as quartz,sericite and calcite in schist directly affects the strength of rock mass and anisotropic index and the content of quartz is the priority factor to the strength of discontinuities Under the influence of tectonic action,the strength parallel to the foliation plane is greater than perpendicular,According to the numerical simulation results,the stress of slope will be changed after disturbance,and the failure mode of Anti slope will change from toppling failure to traction failure,.Slope with different structure and hydrophilic mineral content,appropriate calculation parameters should be considered in practical engineering.