复杂地质条件下多级高边坡组合支护方案与稳定性预测研究  

STUDY ON THE COMBINED SUPPORT SCHEME AND STABILITY PREDICTION OF MULTISTAGE HIGH SLOPE UNDER C OMPLEX GEOLOGICAL CONDITIONS

作　　者：焦卫宁[1] 穆日盛 李征 JIAO Wei-ning;MU Ri-sheng;LI Zheng(CCCC Second Highway Engineering Co.,Ltd.,710065,Xi'an,China;CCCC Shec Seventh Highway Engineering Co.,Ltd.,530100,Nanning,China;Xi'an Huachuang Civil Engineering Science&Technology Co.,Ltd.,710075,Xi'an,China)

机构地区：[1]中交第二公路工程局有限公司,西安710065 [2]中交二公局第七工程有限公司,南宁530100 [3]西安华创土木科技有限公司,西安710075

出　　处：《建筑技术》2024年第14期1697-1701,共5页Architecture Technology

摘　　要：以镇赫高速陈贝屯至煤灰堡段为例,根据工程地质、边坡等级和边坡特性等因素对边坡不同剖面采用衡重式挡墙、俯斜式挡墙、桩+锚索、锚杆+面板等支护形式。从病害原因分析和处治手段出发,研究了多级高边坡支护的质量保证措施。基于LightGBM算法建立边坡稳定性预测模型,验证模型精确性后给出预测模型的特征相对重要性结果和预测结果。结果表明:建立预测模型可较好地预测边坡稳定性;影响边坡稳定性最关键的因素为中土体粘聚力,其次为边坡角β,孔隙压力比和土体重度对边坡稳定性影响不大;镇赫高速K2+051~K2+340段边坡稳定概率为0.9,失稳概率为0.1。本项目运营经验表明,组合支护方案及质量保障措施有效提高了项目施工质量、减少了返工现象,保证了项目的经济效益。Taking the Chenbeitun to Huishuibao section of Zhenhe Expressway as an example,different support methods are used to reinforce different sections of the slope based on factors such as engineering geology,slope grade,and slope characteristics.The main support methods include balance weight retaining walls,inclined retaining walls,piles+anchor cables,anchor rods+panels,and other forms of support.Starting from the analysis of disease causes and treatment methods,the quality assurance measures for multi-level high slope support were studied.Afterwards,a slope stability prediction model was established based on the LightGBM algorithm.After verifying the accuracy of the model,the relative importance of the predicted model's features and the prediction results were given.The results showed that the prediction model established in this paper can effectively predict slope stability.The most critical factor affecting slope stability is the cohesion of the soil mass,followed by the slope angleβ,The pore pressure ratio and soil density have little effect on slope stability.The stability probability of the slope in the K2+051~K2+340 section of Zhenhe Expressway is 0.9,and the instability probability is 0.1.The operational experience of this project has shown that the combined support scheme and quality assurance measures have effectively improved the construction quality of the project,reduced rework,and ensured the economic benefits of the project.

关 键 词：边坡支护 多级高边坡 质量保障措施 稳定性预测 LightGBM 混淆矩阵 

分 类 号：TU74[建筑科学—建筑技术科学]