考虑施工过程的基坑锚杆支护模型试验研究  

Model test research of bolt supporting of foundation pit considering construction process

作　　者：范秋雁[1] 陈波[2] 沈冰[3] 

机构地区：[1]广西大学资源与环境学院,南宁530004 [2]广西电力工业勘察设计研究院勘察分院,南宁530023 [3]广西大学土木工程学院,南宁530004

出　　处：《岩土力学》2005年第12期1874-1878,共5页Rock and Soil Mechanics

基　　金：广西教育厅科研项目资助(No.桂教科研[2002]316号)

摘　　要：通过大型室内模型试验,研究了土质基坑在开挖和预应力锚杆施工过程中土中应力、锚固段应力及基坑壁侧向位移的变化规律。结果表明,在基坑开挖过程中,基坑壁附近的土体应力状态变化显著;锚杆锚固段应力呈非线性递减分布;基坑壁侧向位移随施工过程的进行而呈增大的趋势。在模型试验基础上,对土层锚杆的锚固和变形机理进行了探讨,结果表明:必须建立一个包括基坑周围土体以及锚杆等在内的完整力学模型,且考虑施工过程,才能较精确地求解基坑周围应力场和位移场。The soil stress, anchoring segment stress and foundation pit side displacement are researched by large-scale indoor model test during construction process of a foundation pit. The result indicates that when the foundation pit is excavated, the soil stress state near the foundation pit wall changes obviously; the stress of anchoring segment of bolt appears distribution of nonlinearly decreasing gradually; The side displacement of foundation pit takes on the tendency increased with going on of construction process. On the basis of model test, anchoring and deformation mechanism of soil bolt are discussed. The conclusion is that an integral mechanical model which includes the soil around the foundation pit and bolt etc., should be established with considering construction process. Thus the stress field and displacement field surrounding the foundation pit can be calculated accurately.

关 键 词：基坑 锚杆支护 模型试验 锚固机理 

分 类 号：TU411[建筑科学—岩土工程]