含裂隙煤层底板突水规律的数值模拟与工程应用

本文结合淮北杨庄矿某工作面实际工程情况, 利用NCAP-2D-W对煤层底板突水进行多方案的数值模拟试验研究。主要内容包括:(1) 考虑在承压水不变的条件下,设计不同裂隙分布状态,探讨单裂隙、多裂隙、不同长度裂隙对煤层底板破坏的影响及开采矿压对裂隙顶部破坏的影响;(2) 考虑承压水的变化,分别考虑单裂隙和多裂隙两种分布状态,探讨裂隙对煤层底板破坏的影响及开采矿压对裂隙底部破坏的影响。通过分析受采动荷载、岩层结构变化、煤层底板中裂隙分布状态及承压水变化等因素影响的数值试验,获得了随开采工作面不断推进煤层底板破坏区的发展、突水导升高度的递增、突水通道的形成等相关规律。

Numerical simulation of water inrush law in coal seam floor with cracks and its application to engineering practice

According to actual engineering of some working face in Huai bei Yangzhuang coal mine, the several schemes of numerical simulating test on the water inrush from coal seam floor are researched utilizing NCAP-2D-W in this paper. Its main content is such as following: (1) In condition that confined water is unchangeable, different crack states are designed and the effects made by single crack, multiple crack, different length crack on the damage of coal seam floor are discussed. The mining pressure affect on crack top is also studied. (2) In condition that confined water is changing, the two status about single crack and multiple cracks are respectively took into account and the effect which is made by the crack and mining pressure on coal seam floor damage is investigated. Through analyzing the numerical test affected by mining load, rock structure movement, crack distributing state, and confined water movement, the interrelated rule about the expand of damage area, increasing by degree of water inrushs moving height and forming of water inrush channel can be obtained in this paper.