基于流固耦合的重力坝深层抗滑稳定离散元分析  

Distinct Element Method for Analyzing the Stability of Gravity Dam Against Deep Sliding Based on Fluid-solid Coupling

作　　者：王辉 常晓林[2] 周伟[2] 邓建辉[3] 

机构地区：[1]长江勘测规划设计研究院,湖北武汉430010 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《四川大学学报（工程科学版）》2010年第1期48-53,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金项目(50579055;50779048);国家杰出青年科学基金(50725931)

摘　　要：在计算节理和断层时,基于连续介质力学的有限元法和假设岩体为刚性体的刚体极限平衡法有其内在的缺陷,在重力坝深层抗滑稳定的计算中遇到较大的困难,而离散元方法可以解决这些问题。采用离散元强度储备系数法分析了重力坝的深层抗滑稳定,其中考虑了渗流与变形的耦合效应,得到了坝体在降强前后的应力位移规律,给出了抗滑稳定安全系数和最终的破坏滑动模式。通过对关键点部位的应力及位移变化情况的记录,更清楚的了解坝体的变形情况和受力特点,而后将考虑流固耦合与不考虑耦合作用的结果进行了对比,考虑耦合的计算结果较小,其值偏于安全。最后通过与刚体极限平衡等K法计算结果进行了比较,采用流固耦合方法的计算结果与等K法结果比较接近,而其该方法物理概念明确,可以采用其方法计算重力坝深层抗滑稳定问题。Distinct Element Method of UDEC was used to simulate the stability of gravity dam against deep sliding. Fluid-solid coupling effect was considered. Dana＇ s stress and displacement were then gained before and after reducing the strength of the base materials. The safety factor and the sliding mode of the dam were gained. Variations of stress and displacement of key points were taken records, and its charateristics were studied. The UDEC considering fluid-solid coupling were compared with that not considering coupling, the resulte of UDEC not considering fluid-solid coupling are too large and not correspondent with practice. Finally the results were compared with the rigid body limit equilibrium method. Numerical results showed that the Distinct Element Method of UDEC is reliable and feasible, and can increase the calculation efficiency.

关 键 词：流固耦合 离散元 重力坝深层抗滑 UDEC 刚体极限平衡法 强度储备系数法 

分 类 号：TV223.3[水利工程—水工结构工程]