采煤沉陷区建筑地基稳定性分析方法对比研究
Comparative study on stability analysis method of building foundation in coal mining subsidence area
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摘要:
近年采煤沉陷区土地被广泛用作建设用地，建筑地基的稳定性直接决定沉陷区新建建筑物的可行性，而稳定性分析方法的选取是建筑地基稳定性分析的重要一环。为筛选出适用于采煤沉陷区建筑地基稳定性分析的最优方法，以淮北中湖采煤沉陷区为研究对象，针对沉陷区新建建筑物的地基稳定性分析问题，探讨了影响地基稳定性的主要因素，总结了地基稳定的评价标准，分别使用概率积分法、力学解析法和经验公式法对研究区地基进行了稳定性分析，并综合分析过程中的工作量、准确性、适用条件和模型构建因素对各方法进行了对比分析，指出了采煤沉陷区建筑地基稳定性分析的最适方法。研究表明：经验公式法在实际的地基稳定性分析中工作量小、准确性高、适用性强，模型可调性高，更适用于采煤沉陷区建筑地基稳定性分析的实际工程应用，力学解析法其次，概率积分法再次；概率积分法、力学解析法和经验公式法对研究区的地基稳定性评价结果与工程实际基本一致，研究区地基处于稳定状态；概率积分法实现了研究区未来十年的地表残余变形预计，今后研究区仍处于缓慢移动的状态，最大残余下沉量441 mm，最大残余倾斜1.6 mm/m，最大残余曲率0.02 mm/m2，最大残余水平变形1.5 mm/m，最大残余水平移动110 mm。
Abstract:In recent years, the land in coal mining subsidence areas has been widely used as construction land.The stability of the building foundation directly determines the feasibility of new buildings in the subsidence area, and the selection of foundation stability analysis methods is an important part of the foundation stability analysis of the building foundation. In order to screen out the optimal method for the stability analysis of the building foundation in the coal mining subsidence area, this paper took the Huaibei Zhonghu coal mining subsidence area as the research object, and discussed the influence of the foundation stability of the newly built buildings in the subsidence area. Based on the main factors of stability, the evaluation criteria of foundation stability were summarized, and probability integral method, mechanical analysis method and empirical formula method were used to evaluate the foundation stability of the study area, and the workload, accuracy and applicable conditions in the comprehensive analysis process were comprehensively analyzed. The methods were compared and analyzed with the model construction factors, and the most suitable method for the stability analysis of building foundation in coal mining subsidence area was pointed out. The research shows that the empirical formula method has small workload, high accuracy, strong applicability, and high model adjust ability in the actual foundation stability analysis. It is more suitable for practical engineering applications of building foundation stability analysis in coal mining subsidence areas. The analytical method was followed by the probability integration method; the evaluation results of the foundation stability of the research area by the probability integration method, the mechanical analytical method and empirical formula method were basically consistent with the engineering reality, and the foundation of the research area was in a stable state; the probability integration method realizes the future of the study area.The ten-year residual surface deformation is expected to be in a slow-moving state in the future, with a maximum residual subsidence of 441 mm, a maximum residual slope of 1.6 mm/m, a maximum residual curvature of 0.02 mm/m2, and a maximum residual horizontal deformation of 1.5 mm/m. The maximum residual horizontal movement is 110 mm.
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