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DDA方法块体稳定性验证及其在岩质边坡稳定性分析中的应用

期刊名称：岩石力学与工程学报，27(10)：664-672，2008.
时间：0
分类：P642[天文地球—工程地质学;天文地球—地质矿产勘探;天文地球—地质学]
作者机构：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010, [2]美国DDA公司,美国旧金山CA94002
相关基金：国家自然科学基金资助项目（50639090）;水利部现代水利科技创新项目（XDC2007-10）
相关项目：深部岩体工程特性的理论与实验研究

关键词：边坡工程, DDA, 接触力, 块体稳定性验证, 安全系数, 稳定性分析, slope engineering, discontinuous deformation analysis（DDA）, contact force, validation for rock block stability, factor of safety, stability analysis

中文摘要：

首先，介绍DDA方法中关于块体接触力的计算过程，提出计算沿潜在滑动面稳定性安全系数的计算方法；然后，在此基础上以沿折坡单块体滑动问题为实例，利用DDA方法分别计算仅考虑滑动面摩擦角φ和同时考虑摩擦角φ和黏聚力c条件下块体的运动稳定性和安全系数大小，并与理论值进行比较与验证；最后，针对乌江银盘水电工程右坝肩边坡开挖后因软弱断层控制引起的稳定性及处理措施选取问题，利用已有的极限平衡分析条块系统，将DDA方法应用于该边坡稳定性分析，对边坡的实际稳定状态及锚固效果进行对比分析与评价。研究结果表明，利用DDA方法在计算滑面上条块系统沿滑面稳定安全系数时，因其条块间接触力是建立在严格的力学平衡方程基础上，允许块体系统非连续变形，并且勿需条块界面强度等比例调用的假定，其结果对反映实际岩质边坡的稳定性应该更具合理性。另外，DDA方法关于边坡锚固模拟计算，充分反映和验证了锚杆在边坡稳定性加固处理中的效果。

英文摘要：

The process in calculation of the contact forces between blocks is firstly introduces, and a method about the factor of safety calculation in discontinuous deformation analysis（DDA） is then presented. The stability validation with a rock block sliding along a incline has been carried out. Two cases, one with the friction angle φ and the other with the friction angle φ and cohesion c together, are considered. At last, according to the stability and reinforcement issues of a weak fault controlled rock slope, which is formed by right dam abutment excavation of a hydro-project, DDA method has been used to analyze the stability of the fault controlled rocky slope with the slices used in limit equilibrium methods; and its actual stability states, separately with/without the utilization of rock bolt reinforcement, have been evaluated. It is shown that, for the calculation of the factor of safety along a given sliding surface with DDA method, as the contact forces are based on the rigorous equilibrium equations, where the discontinuous deformation of block system is allowed, the improper assumption for the utilization of shear strength between the sliding slices with a constant ratio is not necessary; and the stability calculation results by DDA method may reflect a more reasonable stability situation of an actual rock slope. In addition, the numerical simulation of rock bolts to the reinforcement of rock slope in DDA shows an effective role in promoting the stability of rock slope.

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