基于遍布节理模型的边坡冻融循环研究

Study on Slope Freeze-Thaw Cycle Based on Joint-Wide Model

为探究顺层岩质边坡在冻融循环作用下的运移规律,以FLAC3D数值模拟软件内置遍布节理模型为研究手段,通过FISH语言和“二分法”编程实现强度折减法在遍布节理模型中的应用。选用不同的节理面倾角和边坡角互相组合计算安全系数,确定安全边坡角;固定边坡角和节理面倾角,发现边坡安全系数随倾向的改变呈对称状分布。对比分析遍布节理模型和摩尔—库伦模型下边坡运移规律,前者计算的边坡安全系数要小于后者;相同情况下添加节理面的遍布节理模型边坡位移和速度变化更符合实际情况。边坡在冻融循环作用下,以遍布节理模型为本构模型研究边坡运移规律,其研究结果更加符合实际现象,能够为矿山开采中遇到的边坡冻融问题提供参考依据。

In order to explore the migration law of bedding rock slope under the action of freezing and thawing cycles,the application of strength reduction method in the ubiquitous joint model is realized through FISH language and"dichotomy"programming,using the built-in ubiquitous joint model in FLAC3D numerical simulation software as the research means.Different joint plane inclination and slope angle are selected to calculate the safety factor and determine the safety slope angle.By fixing the slope angle and joint plane inclination,it is found that the slope safety factor is symmetrically distributed with the change of inclination.By comparing and analyzing the slope movement law under the ubiquitous joint model and the Mohr-Coulomb model,the slope safety factor calculated by the former is smaller than that by the latter.In the same case,the slope displacement and velocity change of the model with joint surface spread across the joint are more consistent with the actual situation.Under the action of freezing and thawing cycles,the ubiquitous joint model is used as the constitutive model to study the slope movement law.The research results are more consistent with the actual phenomenon,which can provide a reference for the freezing and thawing problems encountered in mining.