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Sensitivity analysis of design parameters of soil nailed structure for deep excavation in loess region

ZHOU Yong,ZHU Yanpeng(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)  
Based on more than ten examples of deep excavation in Lanzhou region,the model for internal global safety factor of soil nailed structure in loess region is established by using circular slice method and mesh method.The model for its sensitivity analysis is also established by the global finite-difference method.According to a certain engineering example,the relationships among safety factor,sensitivity and critical design parameters are analyzed.The range of preliminary values of optimum design are given out to guide optimum design of soil nailed structure in loess region,which provides some valuable references to the design and construction of this kind of supporting structure.
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