山区隧道出口松散岩体滑坡位置预测,Advances in Civil Engineering

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山区隧道出口松散岩体滑坡位置预测
Advances in Civil Engineering ( IF 1.5 ) Pub Date : 2019-05-14 , DOI: 10.1155/2019/3535606
Ya-Qiong Wang ₁ , Cheng-Bin Ma ₂ , Zhi-Feng Wang ₃

Affiliation

山区隧道出口松动岩体易发生滑坡，预测滑坡位置是亟待解决的工程问题之一。当前，现有和已使用的预测方法，例如现场监测测量，数值分析，非线性理论和几何方法，都发挥着非常重要的作用，并有其局限性。例如，Wang等人的方法的计算模式与实际工程情况之间存在较大的差异；此外，预测位置与真实位置之间存在较大的差异。为了解决这个问题，本文结合理论分析和工程实际情况，建立了一种最优的计算模式。同时，本文根据应力传递理论重新推导了失稳准则，并研究了影响解法的因素。由于考虑了与滑坡发生有关的参数（β，s，H，α，γ，c，φ和T），因此改进的方法可以更准确地预测滑坡位置。需要指出的是，在Δ≥0且Y≤0的情况下可能发生滑坡。此外，方程式s1 <s <s2和0≤s≤H/ sinα可以精确地确定滑坡位置。将该方法应用于两个工程实例，计算结果表明，预测位置与实际滑坡位置的偏差分别仅为0.10％和0.07％，表明预测结果准确可靠。

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Prediction of Landslide Position of Loose Rock Mass at Mountain Tunnel Exit

Landslide of loose rock mass at mountain tunnel exit occurs easily, and prediction of landslide position is one of the engineering problems to be solved urgently. Currently, existing and used prediction methods, such as field monitoring measurement, numerical analysis, nonlinear theories, and the geometric method, play a very important role and have their limitations. For example, there is a bigger difference between calculation mode by Wang et al.’s method and actual engineering situation; besides, there exists a relatively big discrepancy between the predicted and true position. Aiming to solve this problem, this article combined theoretical analysis and actual engineering situation to establish an optimal calculation mode. At the same time, this article re-deduced instability criteria based on the stress-transferring theory and examined the factors that influence solutions. The improved method can predict landslide position more accurately because the parameters (β, s, H, α, γ, c, φ, and T) related to the occurrence of landslide are taken into consideration. It is pointed out that landslide possibly occurs in the case of Δ ≥ 0 and Y ≤ 0. In addition, the equations s1 < s < s2 and 0 ≤ s ≤ H/sin α can determine landslide position accurately. The method is applied to two engineering examples, and the calculation results show that the deviations of predictive position from the actual landslide position are only 0.10% and 0.07%, respectively, indicating that prediction results are accurate and reliable. It is suggested that the proposed method is a useful tool in the design of tunnel engineering.

更新日期：2019-05-14

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