顺层路堑岩体结构面剪切试验研究和边坡设计优化

Shear Test Study on Structural Plane and Slope Optimization Design of Bedding Cutting Rock Mass

为确定岩体结构面抗剪强度参数,开展了砂岩、砂岩夹泥岩、泥岩、页岩在天然状态及饱和状态下的原位抗剪试验。根据试验设计参数对全线顺层路基边坡进行了优化设计。结果表明:各岩层原位直剪试验的剪切应力和剪切位移的关系曲线具有明显的峰值强度,并出现较稳定的残余强度;结构面强度与试样、颗粒大小、岩质胶结程度、密实程度等因素有关,且在饱和状态下抗剪强度参数较天然状态下低。经设计优化后,节省了建设成本。

In order to determine the shear strength parameters of rock mass structural planes,in-situ shear tests ofsandstone,sandstone with mudstone,mudstone,and shale under natural and saturated conditions were carried out.According to the experimental design parameters,the optimization design for bedding subgrade slope of the whole linewas carried out.The results show that the relationship curve between the shear stress and the shear displacement of thein-situ direct shear test of each rock layer has obvious peak strength and a relatively stable residual strength.Thestructural plane strength is related to factors such as sample and particle size,rock cementation degree,and degree ofcompaction.The shear strength parameter in the saturated state is lower than that in the natural state.After designoptimization,the construction costs are saved.