College of Sciences, Xi’an University of Science and Technology
Key Laboratory of Western Mine Exploitation and Hazard Prevention under Ministry of Education, Xi’an University of Science and Technology
School of Energy Engineering, Xi’an University of Science and Technology
Shaanxi Coal and Chemical Technology Institute Co. , Ltd.

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。

To clarify the evolution law of mechanical response of coal and rock in stope, based on the engineering background of W1143 longwall fully mechanized mining face at Kuangou Coal Mine, we adopt a combination of physical similarity simulation experiment and numerical calculation to establish a numerical simulation pre-treatment method to study the change rule of static mechanical response of coal and rock, on the basis of defining the transient characteristics of the spatial structure of overlying rocks before and after crushing. The results show that the overlying rock spatial structure is composed of rock strata in different lithology outside the fracture and under the mining influence, which is the internal cause for different mechanical responses of coal and rock under the influence. During compaction, due to the instantaneity of hard rock breaking, transient changes in the overburden spatial structure will change for an instant. Hence, the static mechanical response of coal and rock in stope changes step by step, which is essentially a dynamic process. This paper only com-pares and analyzes the equilibrium states before and after the transient changes. The transient spatial structure of overlying rocks causes the step change of the stress field and displacement field of coal and rock in stope, and the step change is concentrated near the transient area. The farther the transient region is, the smaller the change happens.

国家自然科学基金面上项目(52274139,51974227);陕西省自然科学基础研究计划—陕煤联合基金项目(2021JLM-10);陕西省杰出青年科学基金项目(2023-JC-JQ-42)

罗生虎,韩昊强,伍永平,等.结构瞬变影响下采场煤岩静态力学响应的阶变规律[J].煤炭工程,2024,56(7):110-119.