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深圳大运中心桩基施工过程中产生大面积塌陷,其建筑重要性、场地复杂程度、地基复杂程度均为一级,需对场地岩溶地面塌陷危险性进行评价,减少工程施工事故。采用高密度电法、地质雷达、层析成像、钻探等勘察方法查明土洞、溶洞发育特征,然后进行工程地质分析、建立土(溶)洞塌陷的静力学分析模型;分析影响岩溶塌陷的因素,建立包括岩溶基础条件、覆盖层特征、建筑物属性、水文地质条件4个一级指标及8个二级指标的岩溶塌陷危险性评价指标体系;基于Map GIS的数据管理系统,利用PLS Path Model(偏最小二乘通径模型)对场地岩溶地面塌陷危险性进行评价分区,并将地面塌陷危险性等级分为高、较高、较低和低4个等级,分别占场地总面积的1.05%,10.71%,19.39%和68.85%。评价结果客观、合理,其方法可为类似工程提供借鉴。
During the construction of the Shenzhen Grand Canal Center Station, large-scale collapse occurred during construction of the pile foundation. The importance of the building, the complexity of the site and the complexity of the foundation are all one-grade. The danger of collapse of the site karst is evaluated and the construction accidents should be reduced. Identify the development characteristics of soil caves and karst caves by using high-density electric method, geological radar, tomography and drilling, and then carry out engineering geological analysis to establish the static analysis model of soil cave collapse; analyze the influence of karst collapse Factors, the karst collapse risk assessment index system including four primary indicators including karst basic conditions, cover characteristics, building attributes and hydrogeological conditions and eight secondary indicators was established; and a data management system based on Map GIS, using PLS Path Model (Partial Least Squares Path Model) is used to evaluate the subsidence risk of karst ground subsidence, and the danger level of ground subsidence is divided into four levels: high, high, low and low, accounting for 1.05 %, 10.71%, 19.39% and 68.85%. The evaluation result is objective and reasonable, and its method can provide reference for similar projects.