红砂岩力学性能室内大型直剪试验研究

红砂岩在风化崩解过程中，抗剪强度大幅降低，易引起红砂岩质边坡顺层坍滑。为研究其边坡滑塌的力学机制，采用单点法在边坡软弱岩层位置取样、制样，并通过室内大型直剪试验来模拟红砂岩岩层结构面的摩擦剪切情况。试验结果表明：未风化崩解的红砂岩块经历多次干湿循环，其岩层界面的力学性能显著下降，并由此导致其边坡失稳。

Indoor Large-scale Direct Shear Test Study on Mechanical Properties of Red Sandstone

During weathering disintegration of red sandstone, its shear strength decreases significantly, easy to cause bedding collapse of red sandstone slope. In order to study the mechanism of slope collapse, this paper takes and makes samples at the position of soft rock stratum of slope by means of single-point method, and simulates friction and shear of structural surface of red sandstone stratum via indoor large- scale direct shear test. The result of test shows a significant loss of mechanical performance of rock stratum interface decreases remarkably after red sandstone blocks without weathering collapse are subject to multiple dry-wet cycles and cause slope instability accordingly.