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首页> 外文期刊>Advances in civil engineering >Study on Fracture and Stress Evolution Characteristics of Ultra-Thick Hard Sandstone Roof in the Fully Mechanized Mining Face with Large Mining Height: A Case Study of Xiaojihan Coal Mine in Western China
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Study on Fracture and Stress Evolution Characteristics of Ultra-Thick Hard Sandstone Roof in the Fully Mechanized Mining Face with Large Mining Height: A Case Study of Xiaojihan Coal Mine in Western China

机译：大采高综采工作面超厚硬质砂岩顶板的断裂与应力演化特征研究-以中国西部小积寒煤矿为例

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摘要

Ultra-thick hard sandstone roofs present high thickness, poor delamination, and wide caving range. The strata pressure of the working face during actual mining increases, having a significant influence on the safe mining of the working face. Especially, in the mining areas of western China, the fully mechanized mining faces with high mining height and high-strength mining are more prominent. Understanding the fractures and stress evolution characteristics of the ultra-thick hard sandstone roof during actual mining is of high significance to control the dynamic pressure on the working face. In this paper, the typical ultra-thick hard sandstone roof of the Xiaojihan coal mine was taken as an example. The structural and chemical composition characteristics were analyzed. Besides, the fracture characteristics of ultra-thick hard roof during the working face mining were analyzed. Moreover, the fracture structure consistency was verified through physical simulation and a field measurement method. Finally, the stress evolution laws in the ultra-thick hard sandstone roof fracture were studied through numerical simulation. The findings demonstrated that (1) the ultra-thick hard sandstone roof was composed of inlaid coarse minerals, which had compact structure, while the Protodyakonov hardness reached up to 3.07; (2) under the high-strength mining condition of fully mechanized mining face with large mining height, the ultra-thick hard sandstone roof had the characteristics of brittle fracture, with a caving span of 12 m; (3) under the high-strength mining condition of fully mechanized mining face with large mining height, the ultra-thick hard sandstone roof followed the stress evolution laws that were more sensitive to the neighboring goaf. Therefore, it was necessary to reduce the fracture span or layering of ultra-thick hard sandstone roof through the manual intervention method adoption or increase either the strength of coal pillar or supporting body, to resist the impact generated during ultra-thick hard sandstone roof fracture.
机译：超厚硬质砂岩屋顶具有较高的厚度，较差的分层和较大的崩落范围。实际开采期间工作面的地层压力增加，对工作面的安全开采产生重大影响。特别是在我国西部矿区，具有较高的开采高度和较高的强度的综采工作面更为突出。了解实际开采过程中超厚硬质砂岩顶板的裂缝和应力演化特征对控制工作面动压具有重要意义。本文以小济汉煤矿典型的超厚硬砂岩顶板为例。分析了结构和化学组成特征。此外，分析了超厚硬顶板工作面开采过程中的断裂特性。此外，通过物理模拟和现场测量方法验证了断裂结构的一致性。最后，通过数值模拟研究了超厚硬质砂岩屋顶裂缝的应力演化规律。研究结果表明：（1）超厚硬质砂岩顶板由镶嵌的粗矿物组成，结构致密，Protodyakonov硬度高达3.07。 （2）在高采高综采工作面高强度开采条件下，超厚硬质砂岩顶板具有脆性断裂的特征，崩落跨度为12μm; （3）在高采高综采工作面高强度开采条件下，超厚硬质砂岩顶板遵循应力演化规律，对邻近采空区更为敏感。因此，有必要通过采用人工干预的方法来减小超厚硬质砂岩屋面的裂缝跨度或分层，或者增加煤柱或支撑体的强度，以抵抗超厚硬质砂岩屋面破裂时产生的冲击。 。

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