The shield pressure cannot always be used to represent the upper load of longwall panels, since its value is steady or even decreases by the yielding action. However, the leg pressure increment of the shield (LPIS) at the initial stage is not influenced by yielding and could therefore be an important factor to judge the state of overlying loads. In this study, a mechanical model is established to analyze the relationship between the overlying loads of the main roof and LPIS after cutting. There is a linear positive correlation between leg pressure increment and overlying loads and a second-order relationship between leg pressure increment and length of main roof cantilever in the proposed model. Therefore, it can be used to determine the magnitude of roof weighting strength in different periods as well as the length of the main roof cantilever in a period. Finally, the mine pressure difference between the period of fully mechanized mining and the period of fully mechanized caving mining in the MinDong-1 coal mine serves to verify the rationality of the proposed model.

中文翻译：

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盾构初始支腿压力增量的力学模型及其在长壁板屋顶荷载监测中的应用

防护压力不能总是用来表示长壁板的上部载荷，因为其值是稳定的，甚至由于屈服作用而减小。但是，盾构的腿部压力增量（LPIS）在初始阶段不受屈服的影响，因此可能是判断上方荷载状态的重要因素。在这项研究中，建立了一个力学模型来分析主屋面的上覆荷载与切割后的LPIS之间的关系。在该模型中，支腿压力增量与上覆载荷之间存在线性正相关，而支腿压力增量与主屋顶悬臂长度之间存在二阶关系。因此，它可用于确定不同时期的屋顶配重强度的大小，以及一个时期内主屋顶悬臂的长度。最后，以MinDong-1煤矿的综采期与综放开采期之间的矿压差为例，验证了该模型的合理性。