Cracked roof caving region grouting filling similar simulation method
A similar simulation and broken roof technology, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve problems such as uncontrollable, inability to simulate the broken roof with mining and reducing the movement space of the overlying strata
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[0045] The coal occurrence conditions of a certain seam in a certain mine are as follows: the thickness of the coal seam is m=3m, and the thickness of the immediate roof is m z=4m, the rock breaking expansion coefficient K=1.3 directly, and the initial pressing step distance of the adjacent working face is c 0 = 40m, the periodic pressure step is c = 12m, the rock beam is relatively stable at the periodic pressure stage b = 8m, and the length of the filling branch in the goaf is 10m.
[0046] 1. The design and laying of the model, the process is as follows:
[0047] ①Determine the geometric similarity ratio C=1 / 100 of the similar simulation test model;
[0048] ② Lay the coal seam floor and coal seam according to the similar material ratio and laying plan;
[0049] ③ It is used to simulate the determination and laying of the side length a and the number of layers n of the direct roof cube. The process is as follows:
[0050] A. Coal seam thickness m=3m, direct roof thicknes...
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