采用逆可靠度方法的隧道支护抗力计算

doi:10.13722/j.cnki.jrme.2016.1082

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摘要从风险水平的角度初步量化分级安全储备，提出在给定可靠性水平下直接计算隧道支护抗力的方法。该方法首先基于室内和现场试验的数据，利用广义3倍标准差准则得到参数的统计特征；遵循利用围岩应变值作为隧道支护设计基础的理论，采用极限状态函数建立功能函数方程；然后基于一次逆可靠度算法，结合Nataf变换和Cholesky分解构建详细计算程序；最后计算局部安全系数。以经典软岩参数为例，通过一次二阶矩法(FORM)验证该方法精度；分析相关性和初始应力场对隧道支护抗力的影响。最后计算确定在可接受风险水平下的隧道支护抗力及相应局部安全系数。

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	方砚兵
	苏永华

关键词 ：隧道工程, 基于可靠度的设计, 局部安全系数, 逆可靠度, 相关性

Abstract：A direct approach for calculating the support pressure of a tunnel at the given reliability level is proposed in terms of quantified safe margins from the view of acceptable risks. The statistical characteristics of the parameters based on the data from laboratory and field experiments are derived using the generalized three-sigma rule. The tunnel design is based the values of strain and the performance function is established by utilizing the limit state function from the deterministic method. A detailed procedure of calculation is set up by combining Nataf transformation with Cholesky decomposition. The local safety coefficients are determined. The proposed method is verified with the first-order second-moment method(FORM) using the typical parameters of weak rock. The impact of correlation and initial in situ stress on the calculation result are analyzed. The tunnel support pressure and corresponding local safety coefficients are derived under the condition of different acceptable risks.

Key words： tunnelling engineering reliability-based design local safety coefficients inverse reliability correlation

引用本文:

方砚兵，苏永华. 采用逆可靠度方法的隧道支护抗力计算[J]. 岩石力学与工程学报, 2017, 36(7): 1689-1696.
FANG Yanbing，SU Yonghua. Calculation of the tunnel support pressure based on inverse reliability method. , 2017, 36(7): 1689-1696.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.1082 或 http://www.rockmech.org/CN/Y2017/V36/I7/1689

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