降雨及渗流条件下层状砂质板岩 边坡变形破坏模式研究

为增强边坡在恶劣条件下的稳定性,针对降雨及渗流条件下的层状砂质板岩边坡进行研究,采用边坡模型试验和有限元模拟方法,研究了边坡的变形破坏形态和位移变化情况。结果表明,边坡的变形破坏是一个持续发展的过程。主要从坡体中部开始,形成一个D字状的位移曲线,随着降雨时间的增加,最终坡体完全被破坏;当降雨强度分别为600 mm/d和800 mm/d时,边坡中部出现塌落,其降雨时间分别为16 800 s和13 300 s,说明了强降雨对边坡失稳有被更大的加速作用;通过对边坡模型试验和有限元模拟试验的结果对比表明,层状砂质板岩边坡破坏形态和位移变化趋势基本保持一致,验证了模型试验监测数据的准确性和有效性。研究结果为降雨及渗流条件下层状砂质板岩边坡变形破坏机理提供了实验依据和数值模拟参考,可为类似砂质板岩边坡渗流问题研究提供借鉴。

Research on deformation and failure modes of layered sandy slate slopes under rainfall and seepage conditions

In order to enhance the stability of side slopes in harsh conditions, the research on layered sandy slate slopes under rainfall and seepage conditions was carried on, and the slope model test and finite element simulation method were used to study the deformation failure form and displacement change of the slope. The results show that the deformation and failure is a continuous development process. It mainly starts from the middle of the slope and forms a D-shaped displacement curve. With the increase of rainfall time, the slope is completely destroyed. When the rainfall intensity is 600 mm/d and 800 mm/d, the rainfall time required for the collapse in the middle of the slope is 16 800 s and 13 300 s respectively, which shows that the continuous rainfall has a greater acceleration effect on the slope instability. The comparative analysis of the slope model test and the finite element simulation shows that the failure pattern and displacement change trend of the layered sandy slate slope are basically consistent, which also verifies the accuracy and effectiveness of the model test monitoring data. The research results not only provide experimental basis and numerical simulation foundation for the deformation failure mechanism of underlying sandy slate slope under the condition of rainfall and seepage, but also provide reliable reference for similar research on seepage problems of sandy slate slope.