摘要
为响应国家“绿水青山就是金山银山”的发展理念,对废弃矿坑的开发再利用成为热点,而采用合理的稳定性评价方法对废弃矿坑边坡加固设计是后续工作的关键。但这类矿坑边坡通常形状近似圆形或椭圆形,三维空间效应不容忽略,基于传统平面应变假设的简化方法对其进行稳定性分析似乎不太合理。在FLAC3D强度折减法的基础上,提出了一种针对近似圆形矿坑边坡稳定性分析的轴对称模型简化计算方法。基于计算结果的对比分析表明:(1)对于这种类似圆形凹坡,轴对称模型计算的安全系数比传统平面应变模型更准确,减少了计算时间,并且轴对称模型对于各种复杂程度不同的边坡类型同样适用;(2)轴对称模型计算的安全系数与三维模型计算的安全系数非常接近,而传统平面应变模型计算的安全系数偏于保守;(3)将轴对称模型计算结果与现有研究对比,表明两者结果相符,并将其进一步应用于长沙冰雪世界项目矿坑边坡加固工程的稳定性分析中,证明其可为类似工程的边坡稳定性评价提供参考。
To follow the national development concept of"Lucid waters and lush mountains are invaluable assets",the reuse of abandoned mines has become a hotspot.A reasonable stability analysis method to reinforce the slope must be proposed.However,the shape of common mine slope is close to a circle or an ellipse,and thus the three-dimensional space effect of stability cannot be ignored.Based on the strength reduction method of FLAC3D,an axisymmetric numerical analysis method was proposed.Through comparative calculation and analysis,some conclusions can be obtained as follows:(1)For concave slopes with circular-likeshape,the safety factor calculated by the axisymmetric model is more accurate than that of the traditional plane strain model,the calculation time of the proposed model is less,and the proposed model is also applicable to various types of slopes.(2)The safety factor obtained from the axisymmetric model is close to the results obtained from the 3-D model,while the safety factor obtained from the traditional plane strain model is conservative.(3)The calculation results of the axisymmetric model are also consistent with the results from the literature.The proposed model is further applied to the stability analysis of a mine slope reinforcement in Changsha Ice World,which can also be applied in the slope stability evaluation of similar projects.
作者
王杰
吕加贺
谭飞
刘礼领
Wang Jie;LüJiahe;Tan Fei;Liu Liling(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;Central Southern China Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Wuhan 430000,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2023年第3期72-80,共9页
Bulletin of Geological Science and Technology
基金
国家自然科学基金项目(51979253)。
