Composite Soil Nail Deep Excavation Support System Stability Study

This paper mainly studied on stability problem of compound soil nailing in deep excavation, including the inner part and the exterior, settlement around excavation of stability has been put up; On the other hand, combined with the project, the stability criterion of compound soil nailing has been put up. The work including:1. Studying the mechanism research of soil nailing and anchor, clarifying the characteristic of compound soil nailing;2.Analysing the stability of compound soil nailing in foundation pit, especially using the ameliorate break line in inner stability demonstration for the first time. Considering the influence of soil parameter to stability, this article use reliability theory to calculate the probability of compound soil nailing deviate from the stability. Then applying in the engineering analysis of the deep foundation pit with this method, proved its feasibility;3.Using the synthesize judgment of stability to compound soil nailing in deep excavation, according to the distortion measure data, the stability criterion of compound soil nailing has been put up;4.Putting forward the concept of generalized deep excavation for the very first time, synthesize each factor of the design, construction of the deep excavation to consideration, theorize and systemize the deep excavation supporting problem.