应力流守恒原理及地下洞室群支护结构设计方法

为解决复杂洞室群各洞室之间岩墙、岩板的受力计算和稳定性分析的难题,基于力学平衡的思想提出应力流守恒原理,即隧道开挖前后任意水平剖面围岩竖向应力流和任意竖直剖面的水平应力流将保持不变,从而计算洞室群中各个岩墙、岩板、岩柱的受力,并根据其稳定性设计支护结构措施。京张高铁八达岭长城站地下洞室群支护结构设计结果表明,与传统经验法和数值模拟法设计相比,基于应力流守恒原理的洞室群支护结构设计方法具有计算便捷、安全可靠的优点。

Principle of Stress Flow Conservation and Design Method for Support Structure of Underground Cavern Group

In order to calculate the stress and analyze the stability of the rock wall and rock plate between the underground caverns, the principle of stress flow conservation, i. e. the vertical stress flow of surrounding rock of arbitrary horizontal section and the horizontal stress flow of arbitrary vertical section remain unchanged before and after tunnel excavation, is put forward based on the idea of mechanical balance. Thus, the force of each rock wall, plate and pillar in the cavern group is calculated, and the supporting structure measures are designed according to their stability. The design results of underground cavern group in Badaling Great Wall Station on Beijing-ZhangjiakouHigh-speed Railway show that, compared with the traditional empirical method and numerical simulation method, the support structure design method based on the principle of stress flow conservation has the advantages of convenient calculation, safety and reliability.