临近深基坑的高边坡稳定性动态监测及险情分析  

Analysis of slip-risk and dynamic monitoring of a high building slope fringed a deep-founding pit

作　　者：王启云[1] 谷淡平[2] 张家生[1] 熊智彪[2] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]南华大学城市建设学院,湖南衡阳421001

出　　处：《安全与环境学报》2011年第2期166-171,共6页Journal of Safety and Environment

摘　　要：结合工程实例对由基坑与边坡组成的复杂体系的变形特征及支护结构工作特性进行了研究。周边环境复杂的基坑采用桩锚支护结构,局部采用土钉墙;基坑南面侧壁紧邻高边坡,边坡支护结构采用锚喷体系,在基坑开挖过程中监测基坑支护结构顶部水平位移、深层土体位移以及锚索轴力,并重点监测边坡变形和锚索拉力。结果表明,桩锚支护结构能有效控制基坑变形,在基坑开挖过程中锚索轴力呈现波动增加或减小。降雨会导致边坡锚索轴力增加,相邻锚索张拉可导致锚索预应力损失达10%以上。在开挖过程中边坡某些部位多次出现变形过大并导致边坡出现险情。在分析研究结果的基础上提出了抢险及加固方案。The paper intends to report our analysis of slip-risk and dynamic monitoring of a high building slop fringed a deep-founding pit. In our paper, we trial-used the combination of a single row of artificially-dug-up piles and pre-stressed anchor rope as the barcing system for the foundation pit in the complicated surroundings, with soil nail wall put on partial side. A slope was supposed to be built near the southern side of the pit supported with an anchor-plate retaining structure. In the process of excavation, monitoring was to be done to see if any horizontal displacement, deformation of deep soil took place with the axial load of anchor rope getting loose or any technical data and code dispatched from the demand. The pit-monitoring results we have found indicate that the pile-anchor system helps to control the deformation effectively, whereas the axial load of anchor rope was discovered fluctuating to increase or decrease in the process of excavation with the average change being about 11%. The slope monitoring results show that the axial load of the rope has somewhat enhanced due to the rainfall. In addition, the pre-stressed loss after being locked was found to exceed 10% because of intensive stretching of the adjoining ropes, the rotative boring of the anchor rope against the stabilization and deformation-increase of the unstable slope. In the process of excavation, the deformation in some parts was found too big and resulted in a dangerous state. While keeping tracing the dangerous state of the side of the foundation pit, we have depicting the deformation and the unstable part of the anchoring device with its axial loading in a close way. As a result of comprehensive analysis, design, construction and monitoring, we have concluded that dangerous situation took place for the reason that the overbreak, explosive excavation, rainfall and so on are all the factors contribute to the hazardous state. Seeing there exist all these problems, we have proposed corresponding emergency measures and reinforcement measure

关 键 词：土木建筑工程施工 边坡 水平位移 预应力锚索 

分 类 号：TU476[建筑科学—结构工程]