【作者】 郭捷；

【导师】 谢康和；

【作者基本信息】 浙江大学 ， 建筑与土木工程， 2004， 硕士

【摘要】 随着城市建设的不断发展，高层建筑的兴起和地下空间的开发利用，基坑开挖工程日益增多。土钉支护由于施工速度快、成本低而在基坑工程中得到广泛的应用。但土钉支护技术毕竟是一种新事物，在使用过程中也发生过各种事故，因此需要对该技术进行进一步的总结和研究。 本文首先简要回顾了土钉支护技术的发展历程，对土钉支护的定义、分类、适用范围做了较详细的说明，对土钉支护技术与传统支护技术做了分析比较，并介绍了复合土钉支护技术的发展现状。 然后，对土钉的作用机理、土钉的界面粘结性能、水土作用的机理进行了较详细的分析。并根据现有的工程实践和分析计算，对土钉支护水平位移与拉力的分布规律、破坏模式、边坡稳定性进行了归纳总结。进而通过对基坑土钉支护工程的典型事故，如软土基坑事故、水土作用事故、复合土钉支护事故以及综合原因导致的基坑事故的发生、经过及处理措施进行详细的分析，总结出不恰当的勘察、设计、施工以及水土作用等是导致基坑土钉支护事故的主要原因。 最后，针对基坑土钉支护工程提出了如何通过正确的勘察、设计、施工、监测措施来预防事故的发生。对于水土作用对土钉支护结构的危害，也提出了具体的防治措施。更多还原

【Abstract】 With the continuous developments of the urban construction, the springing up of the high buildings and the opening up of the underground space, the deep excavation project is increasing greatly. As an effective retaining technique, soil nailing is widely used for its quickly construction and low cost. However, there are still many accidents occurring in excavation of soil nailing. Therefore, it is significant to make further studies on soil nailing.In this thesis, the development of soil nailing and its definition, classifications and scope for application are summarized and illustrated. The differences between soil nailing and traditional bracing techniques of foundation pit are compared, and the development of composite soil nailing technique is introduced.Secondly, the work mechanism and the shear strength between soil and nail as well as the action of water to soil are studied. Based on the available soil nailing cases and relevant computations, the development laws of horizontal displacement and tensile force of soil nails, the failure configurations, the stability of slope and its analysis methods are summarized. Further more, through the investigations and analyses for the process and treatment of some typical accidents of soil nailing, including the one occurred in soft soil foundation pit, the one induced by the action of water, the one happened in composite soil nailing, and the one caused by multiple factors, it is shown that the incorrect exploration, design, construction and the action of water to soil are the main factors leading to accidents of soil nailing.Finally, the proper principle and method in exploration, design, construction and monitoring of soil nailing to avoid accident of soil nailing are proposed. The concrete method to prevent the accident concerned with the action of water to soil is also proposed.更多还原