用加速度方法分析隧洞的稳定性

为了能够用统一的模式和评价标准计算地下隧洞的稳定性,将加速度计算的概念引入地下隧洞的稳定分析中,提出基于加速度计算的隧洞稳定分析方法。算例的计算结果与点安全系数有着相同的趋势,却又比点安全系数更适合反映隧洞围岩的整体稳定状态。通过绘制加速度和加速度系数等值线,可以清楚地了解隧洞围岩各部位的稳定情况及其空间分布特征。这种方法概念明确、思路简单、便于操作,而且与边坡稳定分析方法有相同的计算模式,从而解决了难以用常规方法处理的隧洞稳定性评价问题。

Stability analysis of tunnel using the acceleration method

For the underground tunnel, current stability analysis methods usually have such limitations as being empirical as well as having discrepancy in evaluation criteria. In order to calculate the stability of underground tunnels with unified models and evaluation criteria, the concept of acceleration calculation is introduced into the stability analysis of underground tunnels, and a tunnel stability analysis method based on it has been put forward. Example shows that the calculated results of acceleration have the same trend with those of the point safety factor, and the proposed method is more suitable to reflect the overall stability of tunnel surrounding rock than the point safety factor. Additionally, by drawing the contour of acceleration and acceleration factor, the stability of surrounding rock and its spatial distribution characteristics can be plainly illustrated. This explicit method can be easily achieved with a uniform mode and an evaluation criterion both for tunnel and slope, so as to solve the problem of tunnel stability evaluation which is usually difficult to be handled by traditional methods.