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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1.重庆市地质矿产勘查开发局208水文地质工程地质队;2.西安科技大学地质与环境学院

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TU457

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Deformation Mechanism and Treatment Analysis of Bedded Rock Foundation Pit Slope in Karst Area
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1.208-Branch of Hydrogeology &2.amp;3.Engineeing, Chongqing Bureau of Geology and Minera Exploratio

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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,及时制定有效的治理措施,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量为主,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。

    Abstract:

    : In order to study the deformation and failure mechanism of Shenxiudong bedded rock foundation pit slope in Tiansheng Sanqiao 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 FLAC3D, 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.

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熊超,赵 鹏,武 超,等. 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[J]. 科学技术与工程, 2019, 19(29): 260-265.
xiong chao,, and. Deformation Mechanism and Treatment Analysis of Bedded Rock Foundation Pit Slope in Karst Area[J]. Science Technology and Engineering,2019,19(29):260-265.

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  • 收稿日期:2019-03-09
  • 最后修改日期:2019-07-06
  • 录用日期:2019-06-05
  • 在线发布日期: 2019-10-25
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