摘要
为了研究覆岩导水裂缝带最大发育高度,以小保当矿区2-2煤层为研究对象,通过理论分析、相似材料模拟实验、实例验证等方法,在应用极限曲率预计导水裂缝带发育高度的基础上,借助概率积分法将导水裂缝带上部岩层与煤层的间距、下沉系数η(z)、开采高度m与导水裂缝带上部岩层最大曲率变形值K(z)max有机结合,给出了以导水裂缝带上部岩层最大曲率变形值K(z)max为关键参数的覆岩上行裂缝发育高度关系式和以地表最大水平拉伸变形值εxm为关键参数的下行裂缝发育深度关系式。在此基础上给出了一种基于概率积分法的导水裂缝带发育高度理论预计方法,应用该预计方法对小保当矿区2-2号煤层开采覆岩导水裂缝带最大发育高度进行了预计,其最大发育高度为160.1 m,与现场实测152.01~175.57 m基本吻合,研究成果可为相似工况下实现保水开采提供理论依据。
In order to study the maximum development height of water flowing fractured zone in overburden strata,2-2 coal seam in Xiaobaodang mining area is taken as the research object.Through theoretical analysis,similar material simulation experiment,case verification and other methods,on the basis of applying limit curvature to predict the development height of water-conducting fracture zone,the distance between the upper strata of water flowing fractured zone and coal seam,subsidence coefficient,mining height and the maximum curvature deformation value of the upper strata of water flowing fractured zone are combined using probability integral method.The relationship between the development height of the upward fractures in the overlying strata with the maximum curvature deformation value of the upper strata of the water-conducting fracture zone as the key parameter and the relationship between the development depth of the downward fractures with the maximum horizontal tensile deformation value as the key parameter are given.On this basis,a theoretical prediction method for the development height of water flowing fractured zone based on probability integral method is given,using which the maximum development height of water flowing fractured zone of the research object is predicted.The result is 160.1 m,which is basically consistent with the field measurement(152.01~175.57 m).
作者
赵兵朝
冯杰
赵阳
马云祥
侯恩科
孙浩
王京滨
ZHAO Bingchao;FENG Jie;ZHAO Yang;MA Yunxiang;HOU Enke;SUN Hao;WANG Jingbin(School of Energy,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Mining and Disaster Prevention in the West of the Ministry of Education,Xi’an University of Science and Technology,Xi’an 710054,China;School of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《煤炭工程》
北大核心
2023年第4期107-112,共6页
Coal Engineering
基金
国家自然科学基金项目(51874230,52074208)。
关键词
导水裂缝带
概率积分法
曲率变形
水平拉伸变形
保水开采
water-conducting fracture zone
probability integral method
curvature deformation
horizontal tensile deformation
water protection mining
