大采深沿空掘巷煤柱尺寸的数值模拟

 为确定适合大采深回采巷道的合理煤柱尺寸,采用数值计算的方法,对留设不同宽度的煤柱进行模拟,分别从巷道围岩的应力分布、变形量及塑性破坏区对煤柱的稳定性进行比较分析.结果表明,煤柱内部应力峰值的分布是确定沿空掘巷窄煤柱的合理宽度重要参考依据,留设的煤柱尺寸应尽量避免应力峰值过高,当煤柱宽度为6—8m时,煤柱所承受的应力峰值不大,顶底板与两帮的位移量较小,此时煤柱较为稳定,便于巷道维护和回采率的提高,同时对煤矿生产安全性给予了保障.本方法的应用对沿空掘巷窄煤柱合理尺寸的确定具有一定的参考价值.

Numerical Simulation for Size of Coal Pillar of Large Mining Depth Along Gob-side Entry Driving Direction

In order to determine a reasonable coal pillar size suitable for large mining depth gateways, numerical simulations are carried out for the coal pilar of different width. Analysis and comparison are made for the stress distribution of the surrounding rock of roadways, and for the deformation and the plastic failure zones to study the stability of the coal pillar. The results show that the coal pillar internal stress peak distribution is an important factor for determining the reasonable width of the narrow coal pillar along the gob-side entry driving direction, the retained size of the pillar should be determined in a way to avoid a too high stress peak value. When the width of the coal pillar is 6-8 m, the stress peak value under the pillar is not large, the displacements of the roof, the floor and two sides are small. Therefore, the pillar is relatively stable, the maintenance of the gateway becomes easy and the recovering rate is enhanced. At the same time , the coal mine production safety is easy to maintain. The application of this method offers a way for determining the reasonable size of the narrow coal pillar along the gob-side entry driving direction.