复杂地质中城门洞型隧洞围岩稳定性快速分析与设计方法

FAST ANALYSIS AND DESIGN METHODS FOR STABILITY OF CITY GATE TUNNELS UNDER COMPLICATED GEOLOGICAL CONDITIONS

着眼于当前地下洞室发展现状,针对信息施工的关键难题——信息反馈难以满足时效性要求,提出基于围岩各主要影响因素数值试验结果量化规律的洞室围岩应力场快速分析的思路与方法。应用系统数值试验概化出影响地下洞室应力场和变形场的8个主要因素(无断层时),以数值试验所得结果为主样本群、以工程实测资料和专家经验为边界样本群基于神经网络技术构建无断层条件地下洞室快速分析系统。在此基础上,通过采用所提出的"断层对变形影响系数"的概念显著削减含断层地下洞室数值试验方案,分别构建单/双断层地下洞室快速分析系统。综合以上3个系统和开发的快速反演和稳定性评价模块,基于VB和FORTRAN混合编程技术构建了隧道快速智能化分析评价系统。经多个实际工程验证显示出较好的可靠性和现场快速分析与评价的适用性。

In order to overcome the key difficulty of the in-time feedback in the informationalized construction of underground caverns,a new method of rapid analysis of the stress field of surrounding rock was put forward based on the results of numerical tests considering the main factors influencing the surrounding rock. Eight factors influencing the stress field of the surrounding rock without fault were identified based on the numerical results. A fast analysis system for the tunnels(FAST) without fault was build based on large amounts of numerical results,measured data,expertise and the powerful artificial neural network method. The FAST with one or two faults were established separately,considering the coefficient of fault influencing deformation to greatly reduce the number of the numerical experiments. With three FASTs and the fast inverse analysis system and the fast evaluation system,a fast intelligent analysis and evaluation system was established using the mixed programming techniques of VB and FORTRAN. Several applications to real engineering problems showed that the system was reliable and applicable.