武都碾压混凝土重力坝深层抗滑稳定破坏试验研究

通过建立武都碾压混凝土重力坝典型坝段坝基的地质概化模型,采用三维地质力学模型试验方法对其天然地基条件下的深层抗滑稳定问题进行系统研究.试验对典型坝段的地形、地质条件,包括岩体、断层、节理等主要地质缺陷的特征进行模拟,根据岩体力学参数及软弱结构面力学参数,研制出适合武都工程地质条件的模型材料,采用超载法进行破坏试验研究.根据试验结果,分析坝体、坝基以及主要断层的变形特征,探讨坝与地基整体失稳的破坏过程、破坏形态和破坏机制,揭示影响坝基稳定的控制性因素,获得典型坝段的滑动破坏机制与稳定安全系数.在此基础上,对坝基加固处理措施进行讨论,为典型坝段的深层抗滑稳定安全评价与基础加固处理设计提供科学依据.

FAILURE MODEL TEST ON DEEP ANTI-SLIDING STABILITY OF WUDU RCC GRAVITY DAM

Based on the geological simplification of the typical sections and dam foundation of Wudu RCC gravity dam,the 3D geomechanical model test on stability against deep sliding in the condition of natural foundation of this dam is performed.In the physical model,the conditions of landform and geology including rock mass,fault and joint of the typical monoliths are simulated.According to the mechanical parameter of the rock mass and weak structural plane,materials suitable for the geological condition of Wudu project are developed.The overloading method is used.As a result,the deformation behaviors of the dam,dam foundation and the main fault are analyzed;the failure process,shape and mechanism of the dam and foundation are discussed;the controlling factors influencing the stability of dam foundation are disclosed and the safety factor and failure mechanism of the typical dam sections are achieved.Thus,the reinforcement measure for the dam foundation is discussed.The presented research results provide references to safety evaluation and design of this dam.