房柱式采空区对下分层复采矿压显现的影响规律研究
Study on influence law of room and pillar gob on pressure behavior of lower seam mining
-
摘要: 为了掌握房柱式采空区内非规则煤柱对下分层复采矿压显现的影响规律，采用数值模拟方法对采空区内煤柱的完整度与矿压显现的关系进行研究，采用物理相似模拟的方法对比分析了煤柱在不同完整度条件下复采工作面上覆岩层的运移、破断规律，据此采用理论分析揭示了煤柱完整度和高低位砌体梁结构稳定性对复采矿压的影响机制，并通过现场观测进行了验证。
结果表明:房柱式采空区内非规则煤柱对下分层复采矿压显现的影响因素主要有2个：①房柱式采空区内煤柱完整度，其完整度越高，复采时矿压显现越为强烈；②高、低位砌体梁结构的稳定性，当房柱式采空区内为完整煤柱时，在高、低位砌体梁结构的共同作用下，矿压显现极为强烈；但下分层复采过程中低位砌体梁结构容易受到采动影响导致结构滑落失稳，从而使矿压显现的强度大幅降低。现场矿压显现差异化明显，上覆煤柱完整时来压强度超过35 MPa，复采工作面大多可观测到完整顶板；顶板的完整性可作为矿压显现的前兆，一旦发现顶板完整区域，应及时对工作面支架补强并进行超前钻探，利用技术手段弱化完整煤柱，控制矿压显现的强度，防止出现矿井安全事故。研究成果可为类似条件下的矿压防治提供参考。Abstract: In order to understand the influence law of irregular coal pillars in the room and pillar gob on the mine pressure appearanceof lower seam mining, a numerical simulation method was used to study the relationship between the integrity of coal pillars and the mine pressure appearance in the gob, by means of physical similarity simulation, the movement and breakage of overburden on the coal face with different integrity conditions were compared and analyzed,and the influence mechanism of coal pillar integrity and high and low position masonry beam structure stability on mining pressure was revealed by theoretical analysis, and the influence mechanism of re-mining pressure has been verified through on-site observation. The results show that there are two main factors that influence the mine pressure appearance: ①the integrity of the coal pillars in the room and pillar gob, the higher the integrity, the stronger the mine pressure appearance will be; ②the stability of the high and low masonry beam structure, when the coal pillars in the room and pillar gob are intact, under the combined action of high and low masonry beam structure, the mining pressure is very strong; however, the low level masonry beam structure is easily affected by mining during the lower layer re-mining process, which causes the structure to slide and lose its stability, thereby greatly reducing the strength of the rock pressure; The on-site rock pressure is obviously different, when the overlying coal pillars are complete, the intrusive pressure strength exceeds 35 MPa, most of the mining face can be observed with complete roof. The integrity of the roof can be used as a precursor to the appearance of mine pressure, once complete area of the roof is found, the support of the working face should be reinforced in time and advanced drilling should be carried out to weaken the complete coal pillar by technical means, so as to control the intensity of the appearance of mining pressure and prevent the occurrence of mine safety accidents. The research results can provide reference for the prevention and control of mining pressure under similar conditions. -
下载:
图(14)
计量
- 文章访问数: 192
- HTML全文浏览量: 0
- PDF下载量: 274
