煤炭工程 ›› 2024, Vol. 56 ›› Issue (7): 110-119.doi: 10.11799/ce202407018

• 研究探讨 • 上一篇    下一篇

结构瞬变影响下采场煤岩静态力学响应的阶变规律

罗生虎,韩昊强,伍永平,等   

  1. 1. 西安科技大学
    2. 无
  • 收稿日期:2023-11-10 修回日期:2024-02-01 出版日期:2024-07-20 发布日期:2024-07-20
  • 通讯作者: 韩昊强 E-mail:1141427759@qq.com

The step change rule of static mechanical response of coal and rock in stope under the influence of structural transient

  • Received:2023-11-10 Revised:2024-02-01 Online:2024-07-20 Published:2024-07-20

摘要: 为了明确采场煤岩力学响应的演变规律,以宽沟煤矿W1143长壁综采工作面为工程背景,采用物理相似模拟实验和数值计算相结合的方法,在明确来压前、后覆岩空间结构瞬变特征的基础之上,建立了一种实现坚硬岩层瞬时破断的数值模拟前处理方法,研究了结构瞬变影响下采场煤岩静态力学响应的阶变规律。结果表明:覆岩空间结构是由破裂面以外、采动影响范围以内不同岩性的岩层所组成的空间岩体结构,是其影响范围内的采场煤岩产生不同力学响应的内因。来压期间,由于坚硬岩层的破断具有瞬时性,导致覆岩空间结构发生瞬变,受此影响,采场煤岩的静态力学响应发生阶变,其本质上为一动力学过程。覆岩空间结构瞬变造成采场煤岩的应力场与位移场产生阶变,阶变集中于瞬变区域附近,距离瞬变区域越远,其阶变量越小。 

关键词: 覆岩结构, 周期来压, 岩层破断, 瞬变, 静态力学响应

Abstract: the evolution of mechanical response of coal and rock is the root cause of coal and rock disaster. It is of great sig-nificance for safe and efficient production of coal mine to clarify the evolution law of mechanical response of coal and rock in stope. Based on the engineering background of longwall fully mechanized mining face of a mine, this paper adopts the method of physical similarity simulation and numerical calculation to study the step change rule of static mechanical response of coal and rock under the influence of structural transient on the basis of comprehensively determining the distribution characteristics of abutment pressure before and after coal mining. The results show that the overlying rock spatial structure is composed of rock strata with different lithology outside the fracture plane and within the mining influence range, and is the internal cause of the different mechanical response of coal and rock in the mining influence range. During the compression period, along with the accumulation of quantitative changes in the progressive evolution of mechanical properties such as boundary conditions and geometric properties within the overlying rock spatial structure such as coal excavation, instantaneous instability of the sub-system of the overlying rock spatial structure such as hard rock breaking occurs during the compression period, and then transient mechanical properties of the overlying rock spatial structure occur. Under this influence, the mechanical response of coal and rock in the stope is transient, the peak abutment pressure decreases sharply, and the peak position transitions to the front of the working face, forming a positive and negative step change zone. Based on the instantaneous fracture characteristics of hard rock, a numerical simulation pre-treatment method for the instantaneous fracture of hard rock is established. By this method, the spatial structure of overburden rock and its mechanical response transients can be quantitatively studied.

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