摘要:
为了研究建筑物及承压水下大采深安全开采可行性,依托高家堡煤矿的地质采矿条件,理论计算得出条带开采参数。应用岩层承载能力和岩层破断距确定关键层与含水层的相对位置关系,建立数学模型,提出开采宽度影响关键层稳定性的判断准则。进一步对该矿工作面开采后关键层及煤柱稳定性进行理论分析,采用FLAC3D模拟计算设计条带参数。结果表明:在建筑物及承压水下大采深开采,理论计算得出开采宽度未影响主关键层稳定性,留设煤柱稳定性良好,模拟出裂采比为18,地表最终呈单一平缓下沉盆地,满足建筑物及承压水体下安全开采的要求,对解决初期矿井接续紧张和保障安全生产至关重要。
Abstract:
In order to study the feasibility of safe mining under the buildings and the large depth of mining under pressure, relying on the geological mining conditions of Gaojiapu Coal Mine, the strip mining parameters were theoretically calculated. We apply the bearing capacity of rock stratum and breaking distance of rock stratum to determine the relative position relationship between key layer and aquifer, establish a mathematical model, and propose the criterion for determining the stability of key layer affected by mining width. Further theoretical analysis of the key layer and coal pillar stability after mining face mining is carried out, and the strip parameters are calculated by FLAC3D simulation. The results show that under the buildings and confined water with deep mining, the theoretical calculation shows that the mining width does not affect the stability of the main key layer; the stability of the retained coal pillar is good, the simulated crack mining ratio is 18, and the surface is finally flat. The sinking basin meets the requirements for safe mining under buildings and confined water, and is crucial to solve the initial tightness of mines and ensure safe production.
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