导水裂隙带发育高度是煤矿顶板防治水的重要参数。通过分析采动覆岩破坏过程，将裂隙带内岩层失稳破坏划分为产生垂向裂隙、形成砌体结构和回转失稳3个阶段；建立了岩层产生垂向裂隙及回转下沉的力学模型，在此基础上，提出了分析岩石产生垂向裂隙与回转失稳的最大下沉量来判断岩层破坏情况，回转下沉量值处于这2个阶段之间的岩层形成稳定的砌体结构，得出了计算导水裂隙带高度的新方法。以营盘壕2201工作面为例，采用理论方法和数值模拟对导水裂隙带高度进行预测，通过与现场实测数据的对比，理论计算(123.3 m)和数值模拟结果(132 m)与实测数据(115.5 m)接近，验证了所提方法的合理性。

The development height of water-conducting fracture zone(WCFZ) is an important parameter for water disaster treatment in coal mine roof. In this paper, the failure process of mining overlying rock is analyzed, and the rock instability failure in the fracture zone is divided into three stages: vertical fracture formation, masonry structure formation and gyratory instability; a mechanical model of vertical cracks and gyration subsidence is established. On this basis, the maximum subsidence of vertical cracks and gyration instability is analyzed to judge the rock failure. The rock stratum with gyration subsidence value between these two stages forms a stable masonry beam structure, and a new method for calculating the height of WCFZ is obtained. Taking the 2201 working face of Yingpanhao as an example, the height of the WCFZ is predicted by theoretical method and numerical simulation. By comparing with the field measured data, the theoretical calculation (123.3 m) and numerical simulation results (132 m) are close to the measured data (115.5 m), which verifies the rationality of the proposed method.