隧道型钢喷混凝土初期支护的可靠度计算方法及应用  

Reliability Calculation Method on Tunnel Primary Lining of Shaped Steel Reinforced Shotcrete and Application

作　　者：黄逸群[1] 林从谋[1] 黄清祥 林大炜 孟希[1] 

机构地区：[1]华侨大学岩土工程研究所,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2014年第2期212-216,共5页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51278208);福建省交通科技发展基金资助项目(200910)

摘　　要：针对隧道中常采用的型钢拱架+喷混凝土的初期支护形式,提出其截面失效的功能函数;采用"位移法"计算初期支护的轴力和弯矩,同时考虑型钢拱架对可靠指标计算的影响;讨论失效概率计算参数的不确定性,确定随机变量的概率特征.最后,利用功能函数对工程实例中隧道型钢喷混凝土初期支护进行可靠度计算,并对其进行安全性评价.结果表明:计算结果与实际状态相吻合,且符合相关规范对可靠指标的规定.A sectional failure performance function was put forward to investigate the usual form of primary lining of shaped steel ＋ arch shotcrete. The ＂displacement method＂ was used to calculate axial forces and bending moments of pri- mary lining, considering the effect of the shaped steel arch on reliability indices. The uncertainties of calculation parame- ters of failure probability were discussed, the probabilistic characteristic of random variable was determined. Using the performance function, the reliability of an engineering tunnel primary lining of shaped steel reinforced shotcrete was calcu- lated. The calculation results coincide with the actual situation, and also meet the requirement of reliable indices in rele- vant codes.

关 键 词：隧道 型钢拱架 喷混凝土 支护形式 功能函数 可靠度 

分 类 号：TU93[建筑科学—结构工程]