Abstract

The control method of deformation of large sections of soft rock formations in coal mines is a major problem in mining practice. Taking Wangzhuang Coal Mine in Shanxi Province, China, for example, the support method of large sections of soft rock formations was studied to control the deformation of the top and bottom plates and two gangs, and to obtain the damage of the surrounding rocks at different depths through drilling imaging. In addition, the displacement, plastic area and stress field distribution patterns of surrounding rocks are obtained by simulating in FLAC3D. Coupling support for broken, plastic and elastic zones is achieved using bolts, grout anchors, and long anchor cables. The bottom of the road is effectively controlled by floor grout and concrete reverse arches. The results show that under the combination of anchorage and grout, the fault depth and degree of the surrounding rocks are less than the original support method, which can effectively reduce the subsidon of the roof and the deformation of the two gangs. It is important to note that anchorage cable set support can effectively reduce shear fault areas in floor and two gang plastic areas, and reduce the weight of the pavement floor. This study provides a technical reference for the support of large sections of soft rock roadways in coal mines.

摘要

煤矿大范围软岩地层变形的控制方法是采矿实践中的主要问题。以山西省王庄煤矿为例，研究了大范围软岩地层的支护方法，以控制顶板，底板和两个帮组的变形，获得不同位置围岩的破坏。钻探成像的深度。此外，通过在FLAC3D中进行模拟，获得了围岩的位移，塑性区域和应力场分布模式。使用螺栓，灌浆锚和长锚索可实现对破裂，塑料和弹性区域的耦合支撑。道路底部由地板灌浆和混凝土反拱有效控制。结果表明，在锚固与灌浆相结合的条件下，围岩的断层深度和程度小于原来的支护方法，可以有效减少顶板的塌陷和两个帮组的变形。重要的是要注意，锚固电缆套件的支撑可以有效地减少地板上的剪切断层面积和两个成组的塑料区域，并减轻人行道地板的重量。该研究为煤矿大范围软岩巷道的支护提供了技术参考。