加锚节理岩体的复合单元法研究  

Study on bolted discontinuous rock mass by composite element method

作　　者：何则干[1] 陈胜宏[2] 

机构地区：[1]广州市市政工程设计研究院,广州510060 [2]水资源与水电工程科学国家重点实验室武汉大学,武汉430072

出　　处：《岩土力学》2007年第8期1544-1550,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.50379039;No.50239070)

摘　　要：加锚节理岩体有着复杂的细部结构和力学行为,常规的数值模型很难满足模拟这种力学行为的要求。进一步发展了笔者建立的加锚岩体的复合单元法,提出加锚节理岩体的复合单元法研究。在不考虑锚杆、节理等细部结构的情况下划分网格,分别定义了加锚岩体复合单元、不连续岩体复合单元和加锚节理岩体复合单元,并建立了其数值模型。同时,在复合单元中还定义了不同材料介质的子单元用来模拟加锚节理岩体内复杂的细部构造。对加锚节理复合单元法进行了理论推导和算例研究,通过与常规有限单元法计算结果的比较,表明了加锚节理岩体复合单元法的合理性,同时也突出体现了其前处理简便的优势。Because of the complicities in the detailed structures and the mechanical behaviours, it is difficult to completely simulate the bolted discontinuous rock with the conventional numerical model. Based on the former works of the authors, the composite element method （CEM） is further developed to study bolted discontinuous rock. The mesh can be generated without taking account of the existence of bolts and discontinuities in this study. The composite elements of bolted rock, discontinuous rock and bolted discontinuous rock can be defined and their CEM model can be formulated respectively. Some sub-elements covering the different materials are also defined to simulate the detailed structures in bolted discontinuous rock. The algorithm of bolted discontinuous rock by composite element method is illustrated and the way to implement this algorithm is introduced. The comparison of the numerical examples between FEM and CEM shows the robustness of the proposed method, and the advantage of CEM over, i.e. very convenient for the pre-process.

关 键 词：加锚节理岩体 复合单元法 有限单元法 

分 类 号：TU452[建筑科学—岩土工程]