断层斜交岩质高边坡开挖变形特征及其治理效果评价--以陕南地区某岩质高边坡为例  

Excavation Deformation Characteristics and Treatment Effect Inspection of High Rock Slope with Oblique Intersecting Faults--Taking a High Rock Slope in the Southern Shaanxi,China as an Example

作　　者：石玉玲[1] 侯明杰 李怀鑫 晏长根[2] 文奎 SHI Yu-ling;HOU Ming-jie;LI Huai-xin;YAN Chang-gen;WEN Kui(School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,Shaanxi,China;School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;PowerChina Roadbridge Group Co.,Ltd.,Beijing 100160,China)

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]长安大学公路学院,陕西西安710064 [3]中电建路桥集团有限公司,北京100160

出　　处：《地球科学与环境学报》2024年第3期400-413,共14页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(42077265,41927806)。

摘　　要：为厘清断层斜交岩质高边坡开挖变形特性以及边坡治理后的时变特性,以陕南地区某断层斜交岩质高边坡为例,综合采用现场调查、数值模拟以及多点位移监测等方法分析断层斜交岩质高边坡破坏机制,归纳了断层斜交岩质高边坡的主要致灾因子,分析了边坡开挖过程中的变形特性,并探讨了边坡治理的时效性。结果表明:研究区域地形陡峭,受断层和坡脚开挖影响呈现出典型临空地形地貌,且受地质构造影响,出露岩体破碎程度较高,节理裂隙发育;基于数值仿真论证了断层斜交岩质高边坡采用“上部锚索锁固+中部坡体刷方+下部锚索和抗滑桩加固”方案治理的可行性,现场调查和监测数据结果表明边坡治理效果明显;断层处流土溶蚀效应明显,强降雨诱发岩质高边坡后缘断层附近平台发生塌陷,在断层和坡脚部位增设排水措施后坡体病害得到有效缓解,整体变形速率得到有效控制。研究成果对断层斜交岩质高边坡的治理及破坏机制分析具有参考意义。To elucidate the deformation characteristics during excavation of high rock slopes with oblique intersecting faults and the subsequent time-dependent behaviour after slope treatment,the comprehensive case study on a high rock slope with faults in the southern Shaanxi was conducted.The on-site surveys,numerical simulations,and multi-point displacement monitoring methods were employed to analyze the failure mechanisms inherent to high rock slopes with oblique intersecting faults,the primary disaster-inducing factors associated with these slopes were summarized,and the deformation characteristics during excavation process were analyzed,and the effectiveness of remedial measures for mitigating issues in high rock slopes with oblique intersecting faults was discussed.The results show that the study area has steep terrain and is influenced by faults and excavation at the foot of the slope,exhibiting typical overhanging terrain features,and geological structure affects the degree of exposed rock breakage and joint development.Numerical simulation demonstrates the feasibility of using an“anchor cable reinforces the upper slope+brushing the middle slope+anchor cable and anti-slide pile reinforces the slope foot”plan for high rock slopes with oblique intersecting faults.Combined with on-site surveys and monitoring data,it is evident that the slope stabilization treatment has a significant effect.The soil erosion effect at the fault site is substantial,and heavy rainfall has initiated a collapse issue on the platform near back edge fault of high rock slope.However,by implementing drainage measures near the fault and the base of the slope,the slope disaster are effectively mitigated while overall deformation rates are effectively contained.The research results have important reference value for the treatment of high rock slopes with oblique intersecting faults and the analysis of their failure mechanisms.

关 键 词：断层 岩质高边坡 边坡防治 破坏机制 数值仿真 变形特性 治理评价 陕西 

分 类 号：P642[天文地球—工程地质学]