开采影响下砂壤土裂缝发育特征研究——以汝河侯村段为例

Research on the Fissure Development Characteristic of Sandy Loam:A Case from Houcun Region of Ruhe

作为一种开采引起的地表非连续破坏形式,裂缝受到井下开采强度、地层结构、表土性质等多种因素影响。以汝河侯村段为例,开展开采影响下砂壤土裂缝发育特征实测研究。土体物理力学性质测试和理论计算表明,砂壤土结构较为松散,黏聚力小,节理性强,较黏土更易产生开采裂缝,裂缝极限发育深度大于黏土区域裂缝深度。同时对研究区域裂缝平面方向呈串珠状,深度方向呈束口状的原因进行了分析。研究成果可为类似地质采矿条件下煤炭资源开采和地面建筑物保护提供技术支持。

As a form of discontinuous surface damage caused by coal mining,fissures are influenced by mining intensity,stratigraphic structure,surface properties,and other factors. Based on Houcun region of Ruhe as an example,the experimental study on sandy loam fissures development characteristics under the influence of underground mining are carried out. The result of soil physical mechanical properties test and theoretical calculation show that the structure of sandy loam is loose with low cohesive force and abundant joints,resulting that the sandy loam is more likely to produce mining fissures than clay,and the limit depth of fissures in sandy loam is greater than that in clay. At the same time,the reasons that the shapes of fissures in plane are strings of beads and that in depth is in mouth shapes are analyzed. The result will provide technical support for mining and ground buildings protection in similar geological and mining conditions.