岩体结构拉裂的块体单元法模拟  

Simulating tension crack of rock masses by block element method

作　　者：李永明[1] 陈胜宏[1] 王均星[1] 

机构地区：[1]武汉大学水利水电学院,湖北武汉430072

出　　处：《岩土力学》2004年第2期203-206,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.59979021)。

摘　　要：基于阶谱块体单元法,提出了二次覆盖的概念和一种分析岩石块体受拉开裂破坏的方法。该方法将块体及其一次覆盖在概念上细分为许多个积分子域,即二次覆盖。在二次覆盖上引入模糊裂纹模型,并把裂缝的形成视为一个粘塑性屈服流动过程,将开裂后产生的不平衡力进行转移,通过迭代使结构重新达到平衡。该方法既能考虑结构本身的不连续性,又能有效地模拟块体受拉开裂和裂纹扩展的现象。数值算例表明,计算结果基本合理。Based on the hierarchical block element method presented earlier, a new concept of subordinate cover and a method to simulate the tension crack in rocky block are proposed. In the new method, each block and its covering element are conceptually divided into many cells that are called as the subordinate covers. The smeared crack model is introduced to the cracked cell and the cracking is regarded as a viscoplastic flow procedure. The out-of-balanced or residual forces arisen in cracking are transferred and the structures will get to equilibrium through the iteration. Thus, both the structural discontinuities and the tension crack propagation of rocky block can be effectively taken into account. Numerical examples show that the proposed method can give reasonable results.

关 键 词：拉裂 块体单元法 二次覆盖 

分 类 号：TU457[建筑科学—岩土工程] TB115[建筑科学—土工工程]