开挖对岩质边坡稳定性影响的数值模拟
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摘要
以西部某露天矿开挖形成的岩质边坡为工程背景,运用数值模拟软件FLAC3D对开挖过程中岩质边坡体开挖方向上的应力演化和变形规律进行了数值模拟研究。研究结果表明:由于露天开挖形成的岩质边坡工程体在开挖过程中其内的压应力将发生明显的减小,自上而下呈"W"型分布,且在边坡体的中部将形成明显的拉应力区,这将是岩质边坡体发生失稳的原因之一;开挖过程也将导致岩质边坡内各岩层产生明显的膨胀变形,且埋深越大时产生的膨胀变形越大;由于复杂应力演化条件作用,岩质边坡坡脚处产生的沿开挖方向的变形最大。
Taking rock slope formed in the process of excavation in the west as project background,the numerical simulation on the law of stress evolution and deformation on the excavating direction of rock slope was carried out by numerical simulation software-FLAC3D.The results showed that the stress of rock slope formed by excavation was significantly reduced in the process of open excavation,showing like "W" from up to down,and tensile stress zone was formed in the middle of model,which was one of key reasons that caused rock slope failure.Significant expansion deformation of rock slope appeared in the process of excavation,and it was bigger as the increase of depth.The deformation along the direction of excavation at foot of the rock slope was maximum because of the rule of complicated stress evolution.
Taking rock slope formed in the process of excavation in the west as project background,the numerical simulation on the law of stress evolution and deformation on the excavating direction of rock slope was carried out by numerical simulation software-FLAC3D.The results showed that the stress of rock slope formed by excavation was significantly reduced in the process of open excavation,showing like "W" from up to down,and tensile stress zone was formed in the middle of model,which was one of key reasons that caused rock slope failure.Significant expansion deformation of rock slope appeared in the process of excavation,and it was bigger as the increase of depth.The deformation along the direction of excavation at foot of the rock slope was maximum because of the rule of complicated stress evolution.
引文
[1]王根龙,伍法权,蔡晓光.考虑层间错动的顺层岩质边坡稳定性[J].水文地质工程地质,2010,37(2):55-59.
[2]徐前卫,朱合华,丁文其,等.直立岩质边坡的渐进性破坏模型试验研究[J].地下空间与工程学报,2010,6(2):33-37.
[3]戴志仁,谢永利,张莎莎.岩质边坡应力场特征有限元强度折减法研究[J].路基工程,2010(2):106-108.
[4]戴妙林,黄天成,张胤,等.单滑动面岩质边坡数值计算影响因素分析[J].水电能源科学,2011,29(2):79-81.
[5]宋胜武,严明.一种基于稳定性评价的岩质边坡体结构分类方法[J].工程地质学报,2011,19(1):6-10.
[6]张永杰,曹文贵,赵明华.基于区间理论与GSI的岩质边坡稳定可靠性分析方法[J].土木工程学报,2011,44(3):93-101.
[7]张均峰,李正国.强地震载荷作用下含断层岩质边坡稳定性分析[J].力学与实践,2010,32(1):24-28.
[2]徐前卫,朱合华,丁文其,等.直立岩质边坡的渐进性破坏模型试验研究[J].地下空间与工程学报,2010,6(2):33-37.
[3]戴志仁,谢永利,张莎莎.岩质边坡应力场特征有限元强度折减法研究[J].路基工程,2010(2):106-108.
[4]戴妙林,黄天成,张胤,等.单滑动面岩质边坡数值计算影响因素分析[J].水电能源科学,2011,29(2):79-81.
[5]宋胜武,严明.一种基于稳定性评价的岩质边坡体结构分类方法[J].工程地质学报,2011,19(1):6-10.
[6]张永杰,曹文贵,赵明华.基于区间理论与GSI的岩质边坡稳定可靠性分析方法[J].土木工程学报,2011,44(3):93-101.
[7]张均峰,李正国.强地震载荷作用下含断层岩质边坡稳定性分析[J].力学与实践,2010,32(1):24-28.
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