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根据现场调查、勘查成果,在煤田地质环境条件分析的基础上,通过地质构造特征和水文地质特征的分析,总结了老市政府-榆林桥南-天湖桥南地区的地表变形特征。受采煤活动引发的断层活化效应作用,榆林桥南地区地表变形最为强烈,伴随地面沉陷发育有4条地裂缝,其次为老市政府地区发育有一条地裂缝,而天湖桥南地区未见采煤活动引发的变性破坏。在此基础上划分出硬岩区倾倒拉张破坏型、软岩区地表移动沉陷破坏型、浅层地表塌陷破坏型3种成因破坏模式,最后从岩体的长期蠕变效应、地质构造差异效应、采充效应、充填体低刚度效应、采煤的采空效应、重复采动效应、矿震效应等方面总结了变形影响因素。总体而言采煤活动是直接的主要诱发因素是外因,地质结构是控制因素是内因,二者相互作用缺一不可。
Based on the field survey and the exploration results, based on the analysis of geologic and environmental conditions of the coalfield, the characteristics of the surface deformation of the old municipal government - Yulinqiao-Tianhuqiao Area are summarized through the analysis of geological structural features and hydrogeological features. Due to the fault activation effect caused by the coal mining activity, the surface deformation in Qiaonan area of Yulin is the most intense with four ground fissures developed along with the subsidence of the earth, followed by the development of a ground fissure in the old city government area, but not in the south of Tianhuqiao area Degeneration and destruction caused by coal mining activities. On this basis, three types of failure modes of the dilapidation of tensile deformation in hard rock area, the surface subsidence type of surface movement in soft rock area, and the collapse of shallow surface collapse are classified. Finally, from the long-term creep effect of rock mass and the differential effect of geological structure , Charging effect, low stiffness of filling body, mining goaf effect, repeated mining effect, mine shock effect and other aspects of the deformation factors. Overall coal mining activity is the main trigger factor is the external cause, the geological structure is the controlling factor is the internal cause, the interaction between the two indispensable.