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采空区特高压输电杆塔的稳定性研究
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摘要
充分运用收集资料、地球物理勘探、钻探等多种勘探方法对采空区输电杆塔地基稳定性进行了分析,并对运用综合物探方法探测采空区进行了有益的探讨,对特高压输电杆塔采空区工程地质勘察方法进行了总结研究。运用概率积分法预测了输电线路路径沿线不同类型采空区地表沉陷变形情况,分析了采空区沉陷变形的主要影响因素,利用FLAC3D数值模拟方法,探讨了充分开采条件下、不同采深采厚比的山西境内煤层的沉陷变形特征,可为压矿区输电杆塔地基与基础的设计提供初步参考。
     在分析特高压沿线输电杆塔采空区沉陷变形的基础上,充分考虑采空区输电杆塔地基与基础协同变形情况,充分考虑到采空区输电杆塔采用的大板基础受力情况、采空区地基变形情况及大板基础的类型等,对大板基础不同类型的受力变形情况进行了数值模拟计算,计算了不同厚度大板基础对杆塔变形的影响,为特高压输电杆塔基础的优化设计提供了依据。
     根据采空区沉陷变形预计结果,对不稳定的采空区输电杆塔地基提出采空区治理方法,制定了处理方案,并对采空区的处理效果进行了检测分析,结果表明处理效果基本达到设计要求。
This thesis explores the sufficient utilization of data collection, geophysical exploration, drilling exploration and other methods to analyze transmission towers foundation stability of the gob area, using comprehensive geophysical prospecting method to effectively explore the large slab, researching and summarizing geological prospecting method of the extra-high voltage electric transmission poles and towers on the gob area. Using probability integration method to predict different types of mined-out area of ground subsidence deformation along the path of the trans-mission lines, the author analyzes the large area subsidence deformation of the main affecting factors. Using FLAC3D numerical simulation method to explore coal bed settlement distortion characteristic in the full conditions of mining and the different mining depth and mining thickness ratios in Shanxi Province, this paper can provide a preliminary reference for the mining area electric transmission poles and towers foundation design.
     In the analysis of the gob area subsidence deformation of the extra-high voltage electric transmission poles and towers, the thesis is taking full consideration of gob area transmission tower foundation and ground deformation together, and also the large slab foundation stress circumstances of the electric transmission poles and towers in the gob area, foundation deformation situation and large slab foundation type, etc. Carrying out the numerical simulation calculation to the different types of stress distortion situation of the large slab foundation, it is calculating the different thickness large slab foundation the influence which distorts to the poles and towers, therefore providing a basis for the extra-high voltage electric transmission poles and towers foundation's optimization design.
     According to gob area subsidence deformation expected conditions, this thesis proposes a gob area treatment method for the unstable transmission tower foundation, drafts a treatment plan, examines and analyzes gob area treatment effects. Results indicate that the treatment effects in general achieve the design requirements.
引文
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