某料场逆层岩质边坡开挖过程数值分析
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摘要
为研究逆层岩质边坡在开挖过程中的各种响应与稳定性,建立某料场逆层边坡开挖有限元模型,分析该料场边坡在开挖施工过程中的位移、稳定安全系数和滑裂面变化趋势。计算结果表明,开挖对边坡上部岩体变形影响很小,对中部和下部岩体变形影响大;开挖过程中边坡稳定安全系数逐渐减小,开挖后边坡稳定性较好;随着开挖深度的增加,滑裂面上缘起点逐渐远离开挖面,而剪出口始终位于坡脚,以此确定了不同开挖深度的重点监测区域;可采用剪应变来描述料场开挖造成的岩体损伤,并将边坡损伤等级划分为3级。研究成果可为该料场后期施工过程中的稳定性监测和加固措施采用提供参考,也可为类似工程提供借鉴。
In order to study the response and stability of reverse rock slope during excavation,a reverse slope excavation model of a material field was established by using finite element program.And then the displacement,the stability safety coefficient and slip surface trend of the material filed in the excavation process were analyzed.The results show that the upper slope of rock mass has little deformation of excavation effect,but the deformation of middle and lower parts is obvious;The stability safety coefficient of slope reduces gradually in the excavation process,and the excavated slope is stable;With the increase of excavation depth,sliding surface on the edge starting point is away from the excavation face gradually,and the cut export has always been at the slope toe,which determined the key monitoring area of different excavation depth;The shear strain can describe quarry excavation caused by the damage of rock mass,and the damage level of the slope can be divided into 3levels.The research results can provide reference for monitoring and reinforcing measures during the later construction of the material yard as well as for the similar projects.
In order to study the response and stability of reverse rock slope during excavation,a reverse slope excavation model of a material field was established by using finite element program.And then the displacement,the stability safety coefficient and slip surface trend of the material filed in the excavation process were analyzed.The results show that the upper slope of rock mass has little deformation of excavation effect,but the deformation of middle and lower parts is obvious;The stability safety coefficient of slope reduces gradually in the excavation process,and the excavated slope is stable;With the increase of excavation depth,sliding surface on the edge starting point is away from the excavation face gradually,and the cut export has always been at the slope toe,which determined the key monitoring area of different excavation depth;The shear strain can describe quarry excavation caused by the damage of rock mass,and the damage level of the slope can be divided into 3levels.The research results can provide reference for monitoring and reinforcing measures during the later construction of the material yard as well as for the similar projects.
引文
[1]徐海涛,梁超.降雨条件下顺层边坡稳定性分析[J].水利水电科技进展,2013,33(5):73-76.
[2]刘蕾,陈亮,崔振华,等.逆层岩质边坡地震动力破坏过程FLAC/PFC2D耦合数值模拟分析[J].工程地质学报,2014,22(6):1 257-1 262.
[3]李祥龙,唐辉明.逆层岩质边坡地震动力破坏离心机试验研究[J].岩土工程学报,2014,36(4):687-694.
[4]赵川,付成华,欧阳朝军,等.水位下降对某悬索桥桥基边坡稳定性影响分析[J].灾害学,2016,31(4):134-138.
[5]朱敏,杨栗.基于极限平衡法和有限元法的岩质高边坡稳定性分析[J].西北水电,2012(3):5-8.
[6]GB18306-2015,中国地震动参数区划图[S].北京:中国标准出版社,2016.
[2]刘蕾,陈亮,崔振华,等.逆层岩质边坡地震动力破坏过程FLAC/PFC2D耦合数值模拟分析[J].工程地质学报,2014,22(6):1 257-1 262.
[3]李祥龙,唐辉明.逆层岩质边坡地震动力破坏离心机试验研究[J].岩土工程学报,2014,36(4):687-694.
[4]赵川,付成华,欧阳朝军,等.水位下降对某悬索桥桥基边坡稳定性影响分析[J].灾害学,2016,31(4):134-138.
[5]朱敏,杨栗.基于极限平衡法和有限元法的岩质高边坡稳定性分析[J].西北水电,2012(3):5-8.
[6]GB18306-2015,中国地震动参数区划图[S].北京:中国标准出版社,2016.