新桥井田内构造发育，在沉积环境、断层以及大型褶曲构造的共同作用下，使得新桥井田内呈现出区块化特征，各个区块间二2煤底板隔水层在岩层厚度、岩层组合关系等方面呈现出差异性，其结构组合形式成为影响底板隔水层阻隔水能力的重要因素。基于上述背景，统计了井田内勘探钻孔资料，选取典型钻孔柱状图，提出并利用“三层段”结构划分方法，将井田范围内二2煤底板隔水层划分成a、b、c、d四类结构模型；从“三层段”中各层段所抵抗的破坏类型以及自身岩层的性质定性评价4类结构模型，得出阻隔水能力由大到小为：a类>b类=d类>c类；以2301工作面为典型工作面，通过对底板隔水层补勘取样和测试分析，得到：Ⅲ层（杂砂岩层）岩石力学强度高；Ⅳ层（粉砂质泥岩层）岩石渗透性能极差。根据采动条件下底板破坏深度现场实测结果和经验公式计算结果的对比分析，确定Ⅲ层（杂砂岩层）为抗采动破坏关键层；并建立以c类结构模型为基础的评价模型，通过定性分析确定了结构对底板隔水层阻隔水能力的影响；最后，对4类结构模型分别进行质量比值系数和强度比值系数与岩层厚度加权计算，分析计算结果并比较了2种计算方法的优缺点。基于上述分析，初步提出了综合考虑隔水层厚度的结构比值系数的概念，为进一步研究阻隔水能力定量评价方法奠定了理论基础。

The structure in the Xinqiaocoalfield is well developed. Under the combined action of sedimentary environment，faults and large-scale fold structures, the Xinqiaocoalfield presents characteristics of blocks. There are differences in the relationship and other aspects, and its structural combination has become an important factor affecting the water-blocking ability of the floor water aquifer. Based on the above background, statistics of exploration drilling data in the well field, selection of typical borehole histograms, and a "three-layer" structure division method are proposed and used to divide the 2-2 coal floor water-proof layer within the well field into 4 types of structural models: a, b, c, d; from the qualitative evaluation of the four types of structural models from the damage types resisted by each interval in the "three-layer section" and the properties of its own rock formation, it is concluded that the water-blocking capacity from large to small is: a>b=d>c; Taking the 2301 working face as a typical working face, through the supplementary survey sampling and test analysis of the floor water aquifer layer, it is obtained that: layer Ⅲ (sandstone layer) has high rock mechanical strength; layer Ⅳ (silty mudstone layer) has extremely poor rock permeability.According to the comparative analysis of the field measurement results of the floor failure depth under mining conditions and the calculation results of the empirical formula, the III layer (sandstone layer) is determined as the key strata of mining failure resistance; and an evaluation model based on the type c structural model was established. The qualitative analysis determined the influence of the structure on the water-blocking capacity of the bottom water aquifer; finally, the weighted calculation of the mass ratio coefficient, the strength ratio coefficient and the thickness of the rock layer were carried out on the four types of structural models, the calculation results were analyzed and the advantages and disadvantages of the two calculation methods were compared. Based on the above analysis, the concept of the structural ratio coefficient comprehensively considering the thickness of the water barrier was initially proposed, which laid a theoretical foundation for further research on the quantitative evaluation method of water barrier capacity.