土钉支护体系抗拔力机理研究

对基坑土钉支护体系中抗拔力机理作用的分析与研究，提出了关于抗拔力的新观点。研究认为，土钉支护体系的抗拔力应由钉土作用抗拔力和土体自承作用抗拔力两部分来组成；土钉在支护体系中首先是作为传力构件传递土体自承作用抗拔力，而后是通过钉土作用提供抗拔力。进一步分别对两部份的抗拔力进行理论求解，确定了土钉支护体系总抗拔力。最后通过工程实例证明了所提出抗拔力机理作用及其求解的正确性。

Research on anti-pulling mechanism in soil-nailing supporting system

The anti-pulling mechanism of soil-nailing supporting system in foundation pit is analyzed and discussed;and a new viewpoint about anti-pulling mechanism is put forward.Anti-pulling force in soil-nailing supporting system mainly originates from two parts: the nail-soil interaction and the self-supporting of soil.In the supporting system,soil-nailing,as a force transfer component,firstly transfers the anti-pulling force originating from the self-supporting of soil;then gives other force by the nail-soil interaction.The total anti-pulling force in the supporting mechanism is determined by solving theoretically the two anti-pulling forces respectively.Finally,an engineering case is introduced to prove the reasonability of the anti-pulling mechanism;and its theoretical solution is suggested.