岩溶区层状岩质基坑边坡变形机制及治理分析——以天生三桥为例
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摘要
为研究天生三桥岩溶景区深秀洞层状岩质基坑边坡变形破坏机制,及时制订有效的治理措施,保证下方施工人员生命安全和基坑的继续施工。通过对深秀洞陡崖工程地质条件研究,并在此基础上结合FLAC3D进行数值模拟,对层状岩质基坑边坡进行深入研究。结果表明:层状岩质基坑边坡开挖破坏坡体内部原有力学平衡,其变形破坏机制为开挖卸荷—滑移—拉裂过程;数值模拟显示两侧崖壁及基坑边坡,极易向外倾结构面发生变形,北东侧基坑边坡上部变形以沉降为主,下部向外倾结构面发生变形,边坡内部剪切应变增量较大区域易发生剪切破坏,并伴随挤压、拉裂现象。针对层状岩质基坑边坡变形破坏机制,提出以"框架锚索"和"肋柱锚杆"为主的分区治理方案,加固效果良好,目前基坑边坡及崖壁处于稳定状态。
In order to study the deformation and failure mechanism of Shenxiudong bedded rock foundation pit slope in Tianshengsanqiao Karst scenic area,effective control measures were formulated in time to ensure the safety of the construction workers and the continued construction of the foundation pit. Based on the study of engineering geological conditions of Shenxiudong steep cliff,and on this basis,combined with the numerical simulation of FLAC3 D,the deep research on foundation pit slope was carried out. The results show that the original mechanical equilibrium of the inner part of the slope was destroyed by the excavation of the bedded rock foundation pit slope,and its deformation and failure mechanism was the excavation unloading-sliding-cracking process. The numerical simulation show that both sides of the cliff wall and the foundation pit slope were prone to deform towards the outward structural plane. The upper deformation of the north-east side foundation pit slope was dominated by the settlement,and the lower part of the foundation pit slope deformed towards the outward structural plane. The shear failure was prone to occur in areas with large increment of shear strain in the slope,accompanied by extrusion and cracking phenomenon. Aiming at the deformation and failure mechanism of the bedded rock foundation pit slope,the partition treatment scheme based on "frame anchor rope"and "rib column anchor rod"was proposed,and the reinforcement effect was good. At present,the slope of the foundation pit and cliff wall are in a stable state.
In order to study the deformation and failure mechanism of Shenxiudong bedded rock foundation pit slope in Tianshengsanqiao Karst scenic area,effective control measures were formulated in time to ensure the safety of the construction workers and the continued construction of the foundation pit. Based on the study of engineering geological conditions of Shenxiudong steep cliff,and on this basis,combined with the numerical simulation of FLAC3 D,the deep research on foundation pit slope was carried out. The results show that the original mechanical equilibrium of the inner part of the slope was destroyed by the excavation of the bedded rock foundation pit slope,and its deformation and failure mechanism was the excavation unloading-sliding-cracking process. The numerical simulation show that both sides of the cliff wall and the foundation pit slope were prone to deform towards the outward structural plane. The upper deformation of the north-east side foundation pit slope was dominated by the settlement,and the lower part of the foundation pit slope deformed towards the outward structural plane. The shear failure was prone to occur in areas with large increment of shear strain in the slope,accompanied by extrusion and cracking phenomenon. Aiming at the deformation and failure mechanism of the bedded rock foundation pit slope,the partition treatment scheme based on "frame anchor rope"and "rib column anchor rod"was proposed,and the reinforcement effect was good. At present,the slope of the foundation pit and cliff wall are in a stable state.
引文
1张璟．层状岩质边坡稳定性的模型试验研究与数值验证[D]．长沙:长沙理工大学，2015Zhang Jing. Study on the stability of stratified rock slope by simulation experiment and numerical verification[D]. Changsha:Changsha University of Science&Technology,2015
2 常来山，陈亚楠，陶东海，等．基于FLAC节理化模型的层状岩体边坡数值分析[J]．中国矿业，2013,22(8):77-80Chang Laishan,Chen Yanan,Tao Donghai,et al. Nmerical analysis of layered rock slop based on FLAC ubiquitous-joint model[J]. China Mining Magazine,2013,22(8):77-80
3 冷霜．层状岩体变形试验的数值模拟[D]．成都:西南交通大学，2008Leng Shuang. Numerical simulation on deformation test of layered rock mass[D]. Chengdu:Southwest Jiaotong University,2008
4 熊诗湖．层状岩体变形特性试验研究[D]．武汉:长江科学院，2007Xiong Shihu. Testing study on deformation characteristics of layered rockmass[D]. Wuhan:Changjiang River Scientific Research Institute,2007
5 Alejano L R,Márquez I G,Alegría R M. Analysis of a complex toppling-circular slope failure[J]. Engineering Geology,2010(114):93-104
6 Mohsen H,Doug S. Investigating the role of kinematics and damage in the failure of rock slopes[J]. Computers and Geotechnics,2016,78(9):181-193
7 范文，俞茂宏，李同录，等．层状岩体边坡变形破坏模式及滑坡稳定性数值分析[J]．岩石力学与工程学报，2000,19(增刊1):983-986Fan Wen,Yu Maohong,Li Tonglu,et al. Failure pattern and numerical simulation of landslide stability of stratified rock[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(S1):983-986
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9 王林峰，唐红梅，唐芬，等．复杂结构面缓倾层状岩体边坡破坏机制[J]．岩土工程学报，2017,39(12):2253-2260Wang Linfeng,Tang Hongmei,Tang Fen,et al. Failure mechanism of gently inclined bedding rock mass slopes with complex fissures[J].Journal of Geotechnical Engineering,2017,39(12):2253-2260
10 常来山，米长宁，陶东海．露天矿层状岩体边坡FLAC节理化本构模型应用研究[J]．煤炭工程，2013,45(11):117-119Chang Laishan,Mi Changning,Tao Donghai. Application study on FLAC highly-jointed constitutive model of layered rock slope in surface mine[J]. Coal Engineering,2013,45(11):117-119
11 符贵军，袁继国，任伟中，等．水驱型层状岩质边坡破坏机理的讨论[J]．科学技术与工程，2017,17(4):143-148Fu Guijun,Yuan Jiguo,Ren Weizhong,et al. The discussion of the failure mechanism in the hydraulic-driven layered rock slope[J].Science Technology and Engineering,2017,17(4):143-148
12 付晓，范刚，刘飞成，等．组合支护结构作用下反倾层状岩质边坡加速度响应振动台试验研究[J]．地震工程学报，2015,37(3):823-828Fu Xiao,Fan Gang,Liu Feicheng,et al. Shaking table tests on the acceleration response of an anti-dip strtified rock slope with composite retaining structure[J]. China Earthquake Engineering Journal,2015,37(3):823-828
13 郭双枫，李宁，姚显春，等．层状岩质边坡稳定性影响因素及精度问题研究[J]．地震工程学报，2017,39(2):362-368Guo Shuangfeng,Li Ning,Yao Xianchun,et al. Study on factors and precision affecting the stability of layered rock slopes[J]. China Earthquake Engineering Journal,2017,39(2):362-368
14 许锐，程辉，李寻昌，等．施工诱发边坡失稳变形机制及应急治理对策[J]．煤田地质与勘探，2017,45(3):107-111Xu Rui,Cheng Hui,Li Xunchang,et al. Deformation mechanism and urgent treatment of unstable slope induced by construction[J].Coal Geology&Exploration,2017,45(3):107-111
15 曹兰柱，孙成亮，王东，等．FLAC3D的露天矿边坡变形破坏数值模拟分析[J]．辽宁工程技术大学学报(自然科学版)，2016,35(7):679-682Cao Lanzhu,Sun Chengliang,Wang Dong,et al. Simulation analysis of damaged degeneration of open-pit mine slope based on FLAC3D value[J]. Journal of Liaoning Technical University(Natural Science),2016,35(7):679-682
16 韩万东，谷明宇，杨晓云，等．FLAC3D数值模拟的边坡稳定性[J]．辽宁工程技术大学学报(自然科学版)，2013,32(9):1204-1208Han Wandong,Gu Mingyu,Yang Xiaoyun,et al. Slope stability based on FLAC3Dnumerical simulation[J]. Journal of Liaoning Technical University(Natural Science),2013,32(9):1204-1208
2 常来山，陈亚楠，陶东海，等．基于FLAC节理化模型的层状岩体边坡数值分析[J]．中国矿业，2013,22(8):77-80Chang Laishan,Chen Yanan,Tao Donghai,et al. Nmerical analysis of layered rock slop based on FLAC ubiquitous-joint model[J]. China Mining Magazine,2013,22(8):77-80
3 冷霜．层状岩体变形试验的数值模拟[D]．成都:西南交通大学，2008Leng Shuang. Numerical simulation on deformation test of layered rock mass[D]. Chengdu:Southwest Jiaotong University,2008
4 熊诗湖．层状岩体变形特性试验研究[D]．武汉:长江科学院，2007Xiong Shihu. Testing study on deformation characteristics of layered rockmass[D]. Wuhan:Changjiang River Scientific Research Institute,2007
5 Alejano L R,Márquez I G,Alegría R M. Analysis of a complex toppling-circular slope failure[J]. Engineering Geology,2010(114):93-104
6 Mohsen H,Doug S. Investigating the role of kinematics and damage in the failure of rock slopes[J]. Computers and Geotechnics,2016,78(9):181-193
7 范文，俞茂宏，李同录，等．层状岩体边坡变形破坏模式及滑坡稳定性数值分析[J]．岩石力学与工程学报，2000,19(增刊1):983-986Fan Wen,Yu Maohong,Li Tonglu,et al. Failure pattern and numerical simulation of landslide stability of stratified rock[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(S1):983-986
8 丁丽萍，蔡俊超，黄刚．层状岩体边坡变形破坏机理分析[J]．路基工程，2014(2):153-158Ding Liping,Cai Junchao,Huang Gang. Analysis on deformation and failure mechanism of a stratified rock slope[J]. Subgrade Engineering,2014(2):153-158
9 王林峰，唐红梅，唐芬，等．复杂结构面缓倾层状岩体边坡破坏机制[J]．岩土工程学报，2017,39(12):2253-2260Wang Linfeng,Tang Hongmei,Tang Fen,et al. Failure mechanism of gently inclined bedding rock mass slopes with complex fissures[J].Journal of Geotechnical Engineering,2017,39(12):2253-2260
10 常来山，米长宁，陶东海．露天矿层状岩体边坡FLAC节理化本构模型应用研究[J]．煤炭工程，2013,45(11):117-119Chang Laishan,Mi Changning,Tao Donghai. Application study on FLAC highly-jointed constitutive model of layered rock slope in surface mine[J]. Coal Engineering,2013,45(11):117-119
11 符贵军，袁继国，任伟中，等．水驱型层状岩质边坡破坏机理的讨论[J]．科学技术与工程，2017,17(4):143-148Fu Guijun,Yuan Jiguo,Ren Weizhong,et al. The discussion of the failure mechanism in the hydraulic-driven layered rock slope[J].Science Technology and Engineering,2017,17(4):143-148
12 付晓，范刚，刘飞成，等．组合支护结构作用下反倾层状岩质边坡加速度响应振动台试验研究[J]．地震工程学报，2015,37(3):823-828Fu Xiao,Fan Gang,Liu Feicheng,et al. Shaking table tests on the acceleration response of an anti-dip strtified rock slope with composite retaining structure[J]. China Earthquake Engineering Journal,2015,37(3):823-828
13 郭双枫，李宁，姚显春，等．层状岩质边坡稳定性影响因素及精度问题研究[J]．地震工程学报，2017,39(2):362-368Guo Shuangfeng,Li Ning,Yao Xianchun,et al. Study on factors and precision affecting the stability of layered rock slopes[J]. China Earthquake Engineering Journal,2017,39(2):362-368
14 许锐，程辉，李寻昌，等．施工诱发边坡失稳变形机制及应急治理对策[J]．煤田地质与勘探，2017,45(3):107-111Xu Rui,Cheng Hui,Li Xunchang,et al. Deformation mechanism and urgent treatment of unstable slope induced by construction[J].Coal Geology&Exploration,2017,45(3):107-111
15 曹兰柱，孙成亮，王东，等．FLAC3D的露天矿边坡变形破坏数值模拟分析[J]．辽宁工程技术大学学报(自然科学版)，2016,35(7):679-682Cao Lanzhu,Sun Chengliang,Wang Dong,et al. Simulation analysis of damaged degeneration of open-pit mine slope based on FLAC3D value[J]. Journal of Liaoning Technical University(Natural Science),2016,35(7):679-682
16 韩万东，谷明宇，杨晓云，等．FLAC3D数值模拟的边坡稳定性[J]．辽宁工程技术大学学报(自然科学版)，2013,32(9):1204-1208Han Wandong,Gu Mingyu,Yang Xiaoyun,et al. Slope stability based on FLAC3Dnumerical simulation[J]. Journal of Liaoning Technical University(Natural Science),2013,32(9):1204-1208
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