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在隧道锚喷支护结构设计中,运用可靠度理论比传统的安全系数法更符合实际。以圆形隧洞围岩的弹塑性解析解为基础,建立隧洞锚喷支护系统的可靠度分析模型。对于非圆形隧洞可视为等效圆形隧洞求其近似解。考虑到隧洞锚喷支护结构系统的的可靠度分析中,功能函数的高度非线性,采用Monte-Carlo法和响应面法计算可靠度指标。计算结果表明响应面法计算结果与Monte-Carlo法相比误差不大,响应面法可以用于锚喷隧道支护设计及参数优化。
In the design of tunnel bolt-shotcrete support structure, the reliability theory is more practical than the traditional safety factor method. Based on the elastic-plastic analytical solution of the surrounding rock of circular tunnel, the reliability analysis model of tunnel anchor-spray supporting system is established. For non-circular tunnel can be regarded as an equivalent circular tunnel approximate solution. Considering the reliability analysis of the tunnel anchor-sprayed support structure system, the function function is highly nonlinear. The Monte-Carlo method and response surface method are used to calculate the reliability index. The calculation results show that the response surface method is less error than the Monte-Carlo method, and the response surface method can be used in the design of bolting and shotcrete tunnel support and parameter optimization.