FLAC3D在滑坡稳定性分析评价中的应用

摘要

Taking the Gaozhi Village landslide as an example, this paper discussed the application of FLAC3D in landslide stability analysis and evaluation. The author ifrst introduced the basic principle and main process of FLAC3D, and then simulated the Gaozhi Village landslide stability under natural state and heavy rain state by Mohr-Coulomb of FLAC3D. The simulation result intuitively showed the distribution characteristics of plastic deformation and horizontal displacement of the slope in the above two conditions, and clearly showed the potential sliding surface inside the slope. According to the result of numerical simulation, the article analyzed and evaluated the landslide stability, studied and discussed the deformation and failure forms of the landslide. By analyzing the plastic deformation and displacement of slope, the author considered that the landslide is basically stable under the natural state and is unstable and likely to slide and lose its stability in the local area under the continuous high intensity rainfall state. This is consistent with the investigation and analysis. This result shows it is feasible and more simple and more intuitive and convenient to analyze and evaluate the stability of landslide by FLAC3D. Compared with the traditional limit equilibrium method, FLAC3D has the incomparable advantage.%本文以高治村滑坡为例，论述了FLAC3D在滑坡稳定性分析评价中的应用。作者首先介绍了FLAC3D的基本原理和主要流程，然后采用摩尔-库伦模型，对高治村滑坡在天然状态和暴雨状态下的变形和位移情况进行了数值模拟，模拟结果直观地显示了该坡体在上述两种状态下的塑性变形及水平方向位移的分布特征，清楚地显示了坡体内潜在的滑动面。文章根据数值模拟结果，对该滑坡的稳定性进行了分析和评价，对该滑坡的变形和破坏形式进行了研究和探讨。通过对该坡体的塑性变形与位移情况分析认为，该滑坡在天然状态下基本稳定；在连续高强度降雨状态下欠稳定，局部失稳滑塌的可能性很大，这与现场调查分析的结果一致。这个结果表明，利用FLAC3D进行滑坡稳定性分析和评价简单、可行，且更加直观、方便，具有传统极限平衡法所无法比拟的优势。