论文部分内容阅读
众所周知,沿着工作面长度方向顶板压力是不尽相同的。长期来人们主要研究工作面中部的顶板压力,事实上工作面上方的老顶如同支承在煤柱上的“板”一样,而“板”的断裂对工作面中部及上、下部的顶板压力影响是不一样的。 本文研究了各种不同支承条件下老顶岩层的初次破断型式。根据模型试验及实测资料研究了老顶的断裂过程、条件以及断裂的型式。根据试验,老顶断裂的型式可以分为横X型、X型及竖X型破坏。 试验证明,只有老顶呈横X型破坏时,工作面中部可以采用“砌体梁”的理论研究矿山压力,而对其它情况则必需用“板”的破坏理论研究矿山压力。
As we all know, along the length of the face roof pressure is not the same. For a long time, people mainly studied the roof pressure in the middle part of the working face. In fact, the top of the working face is the same as the “plate” supported on the coal pillar. The effect of the fracture of the “plate” on the pressure of the roof in the middle part and the upper part and the lower part of the working face are different. In this paper, the primary fracture types of the old roof strata under various support conditions are studied. Based on the model test and the measured data, the fracture process, conditions and fracture types of the roof are studied. According to the test, the pattern of the old roof fracture can be divided into horizontal X-type, X-type and vertical X-type damage. The test proves that only when the top of roof is horizontal X-type damage, the pressure of mine can be studied by using the theory of “Masonry beam” in the middle of the working face, while the mining pressure must be researched by the theory of “slab” destruction in other cases.