China Coal Energy Research Institute Co., Ltd.
China Coal Xi'an Design Engineering Co., Ltd.
Shaanxi Huabin Yadian Coal Industry Co., Ltd.

导水裂隙带高度是顶板水害防治的关键参数之一,为研究强含水层下特厚煤层综放开采条件下导水裂隙带发育高度,以彬长矿区雅店煤矿ZF1405工作面为背景,采用多元非线性回归建立了导水裂隙带高度预测模型,并采用数值模拟和钻孔实测相结合的方法,对该条件下导水裂隙带高度进行了全面探测。结果表明:考虑的影响因素越多,建立的导水裂隙带高度预测模型越合理,模型预测结果为257.4m,相较于经验公式更精确;数值模拟得到的导水裂隙带最大发育高度为244.2m,发育规律可分为缓增阶段(工作面推进0~200m)、突增阶段(工作面推进200~280m)和稳定阶段(工作面推进280m后),其中突增阶段最易发生顶板涌水事故,现场开采时,工作面由开切眼推进至200m后需提前做好预防措施;钻孔钻液消耗量和钻孔窥视探测的导水裂隙带高度分别为247.4,238.4m;数值模拟和钻孔实测结果共同验证了预测模型的可靠性,为安全起见,取4种研究方法的最大值257.4m作为最终结果。研究结果可为类似条件的矿井导水裂隙带高度预测提供参考。

Investigating the height of the water-conducting fracture zone is pivotal for mitigating roof water hazards, particularly under the challenging conditions of fully mechanized top coal caving mining in extra thick coal seams beneath strong aquifers. Set against the backdrop of the ZF1405 working face in the Yadian Coal Mine within the Binchang mining area, this study employed a multifaceted approach. By combining multiple nonlinear regression, numerical simulations, and borehole measurements, it developed a robust predictive model for the fracture zone's height. The findings underscored the significance of considering a wide array of influencing factors to enhance the model's precision, with the predicted height reaching 257.4 m-markedly more accurate than traditional empirical methods suggest. The maximum development height of the water-conducting fracture zone obtained by numerical simulation is 244.2 m. The evolution of the fracture zone was delineated into three distinct stages: a gradual increase observed up to 200 m of working face advancement, followed by a sharp rise between 200 and 280 m, culminating in a stabilization phase beyond 280 meters. This sharp increase phase was particularly prone to roof water inrush incidents, highlighting the need for advanced preventative measures beyond the 200-meter mark. The model's reliability was further corroborated by the convergence of numerical simulation outcomes and borehole observations, which recorded the water-conducting fracture zone heights at 247.4 m and 238.4 m, respectively. Opting for the maximum value of 257.4 m as a conservative estimate, this research provides a solid foundation for predicting the height of water-conducting fracture zones in mines under similar conditions.

刘成勇,宋伟,盛奉天,等.强含水层下特厚煤层综放开采导水裂隙带发育高度[J].采矿与岩层控制工程学报,2024,6(2):023524.

LIU Chengyong, SONG Wei, SHENG Fengtian, et al. Development height of water-conducting fracture zone in fully-mechanized caving of extra-thick coal seam under strong aquifer[J]. Journal of Mining and Strata Control Engineering, 2024, 6(2): 023524.