通过对该矿3号煤层顶板特性的理论分析,结合相似模拟实验及数值模拟结果可

通过对该矿3号煤层顶板特性的理论分析,结合相似模拟实验及数值模拟结果可以得出：该矿3号煤层上覆岩层由直接顶、老顶和地表松散层组成,由于煤层采高很大，导致在直接顶冒落后而无法填满采空区，因此,部分基本顶也呈现不规则冒落状态,即:基本顶分为上位基本顶和下位基本顶两部分,下位基本顶呈现周期性断裂并彼此咬合的特点,上位基本顶未形成整体的贯穿裂隙。下位基本顶下部呈现不规则冒落,待采空区充实后,下位基本顶周期性断裂并彼此咬合, 不断产生裂隙并缓慢下沉的情况是在上位基本顶在煤壁和下位基本顶铰接结构的支撑下，伴随工作面持续推进，裂隙不断发展直至地表。因此, 可以认为位于胜利矿3#煤层上覆岩层在垂直方向处，“三带”分布是没有的，只有冒落带和裂隙带岩层的存在，而没有弯曲下沉带岩层。<br>综上所述，关于工作面煤岩组合力学模型，可见图4-1，它是基于本文构建的胜利矿3#煤层大采高综采的实况。

通过对该矿3号煤层顶板特性的理论分析,结合相似模拟实验及数值模拟结果可以得出：该矿3号煤层上覆岩层由直接顶、老顶和地表松散层组成,由于煤层采高很大，导致在直接顶冒落后而无法填满采空区，因此,部分基本顶也呈现不规则冒落状态,即:基本顶分为上位基本顶和下位基本顶两部分,下位基本顶呈现周期性断裂并彼此咬合的特点,上位基本顶未形成整体的贯穿裂隙。 下位基本顶下部呈现不规则冒落,待采空区充实后,下位基本顶周期性断裂并彼此咬合, 不断产生裂隙并缓慢下沉的情况是在上位基本顶在煤壁和下位基本顶铰接结构的支撑下，伴随工作面持续推进，裂隙不断发展直至地表。 因此, 可以认为位于胜利矿3#煤层上覆岩层在垂直方向处，“三带”分布是没有的，只有冒落带和裂隙带岩层的存在，而没有弯曲下沉带岩层。<br>综上所述，关于工作面煤岩组合力学模型，可见图4-1，它是基于本文构建的胜利矿3#煤层大采高综采的实况。

Based on the theoretical analysis of the roof characteristics of the No.3 Coal Seam in the mine, combined with the similar simulation experiment and numerical simulation results, it can be concluded that the overburden of the No.3 Coal Seam in the mine is composed of the direct roof, the old roof and the loose layer on the surface. Due to the large mining height of the coal seam, the direct roof caving is backward and unable to fill the goaf. Therefore, part of the basic roof also presents irregular caving state, That is to say, the basic top is divided into two parts: the upper basic top and the lower basic top. The lower basic top shows the characteristics of periodic fracture and occlusion with each other. The upper basic top does not form a whole through crack. The lower part of the lower basic roof presents irregular caving. When the goaf is full, the lower basic roof periodically breaks and engages with each other, and cracks continue to appear and sink slowly. Under the support of the coal wall and the hinged structure of the lower basic roof, the cracks continue to develop to the surface with the continuous advance of the working face. Therefore, it can be considered that there is no "three zones" distribution in the vertical direction of the overburden of the 3 × coal seam of Shengli mine, only the existence of the caving zone and fracture zone, but no bending subsidence zone.<br>To sum up, the mechanical model of coal rock combination in working face can be seen in Figure 4-1, which is based on the actual situation of large mining height fully mechanized mining of 3 × coal seam in Shengli mine constructed in this paper.<br>