胶凝砂砾石坝深层抗滑稳定模型试验研究

Model testst on deep anti-sliding stability of cemented sand-gravel dam

胶凝砂砾石坝(CSG坝)是一种新坝型,目前学术界主要针对坝体的结构形式、应力分布及结构强度等方面展开了研究,而关于地基对CSG坝的影响相关研究较少。通过设计地质力学模型试验,模拟了CSG坝在复杂地基上的正常运行及破坏状态。具体为,以守口堡大坝的典型坝段及武都水库^(#)18坝段址区的坝基为研究对象,采用超载法,对模型进行了破坏试验研究,对该工况下CSG坝的深层抗滑稳定进行了研究。研究表明:模型的超载安全度K_(p)为6.0,CSG坝对复杂地基有良好的适应性。模型破坏的主要原因是坝基结构面发生破坏而形成滑移通道,最终坝体沿滑移通道滑动失稳。

The cemented sand-gravel(CSG) dam is a new type of dam.At present,the academic circles have mainly carried out the researches on its structural form,stress distribution,and structural strength,but there are few related studies on the influences of the foundation on the CSG dam.In this study,through the design of geomechanical model tests the general operation of the CSG dam and the failure state on the complex foundation are simulated.Specifically,the typical dam section of Shoukoubao Dam and the dam foundation of No.18 dam site area of Wudu Reservoir are selected for geomechanical model tests.Using the overload method,the model is tested for damage,and the deep anti-sliding stability of the CSG dam under this working condition is studied.The results show that the overload safety K_(p) of the model is 6.0,and the CSG dam has good adaptability to complex foundations.The main reason for the failure of the model is the failure of the structural surface of the dam foundation to form a slip channel,and finally,the dam body slips and loses stability along the slip channel.The research results may provide certain technical support and reference for the practical application of CSG dams on complex foundations.