关键词: 地铁隧道, 波纹钢板, 锚喷支护, 正交试验, 数值模拟, 参数优化

Abstract:

The orthogonal experiment method combined with finite element method is applized to the optimization of support parameters of a mined tunnel section on Hengli Station-Panyu Square Station of Guangzhou Rail Transit Line No. 22, and 9 experiment conditions are designed to study the influences of shoctcrete grade, corrugated steel plate thickness, mortar anchor length and spacing on the stability of tunnel surrounding rock. And then the parameters of boltshotcrete support and the thickness of corrugated steel plate are further optimized by range analysis, and the safety factor is checked by the structural internal force to meet relevant design requirements. The study results show that: (1) The optimized support parameters for typical upper soft and lower hard strata in Guangzhou area are obtained by analyzing the stress and deformation laws of surrounding rock and supporting structure under different combinations of supporting parameters. (2) The range analytical results indicate that the concrete grade is an important influencing factor greatly affects the stability of the surrounding rock, while the corrugated steel plate thickness, mortar anchor length and spacing are the secondaries.

Key words: metro tunnel, corrugated steel plate, bolt-shotcrete support, orthogonal experiment, numerical simulation, parameter optimization