Author:
Hu Hai-ying,Zhang Yu-cheng,Chen Cai-yuan
Abstract
Abstract
Because of the advantages such as easy construction, low cost, short construction period and mature construction techniques, soil nailing has been widely used in engineering. However, at present there is lacks of the calculation theory of soil nailing, and shortages also exist in allowable deformation values specified by current specifications: a) the safety factor of soil nailing wall is generally calculated by conventional limit equilibrium method, which has relatively low computational accuracy for complex soil distribution and can not give the relation between deformation and stability of soil nailing structure; b) current soil nailing specifications just simply specify an allowable deformation value without considering features of foundation pit, supporting types and surroundings, and these specifications also determine the early warning value for monitoring without combining the deformation with the stability of foundation pits. Thus, these shortages lead to the downward trend of usage of soil nailing that has good performance-price ratio in fact.
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