Research on Pressure Relief Method of Close Floor Roadway in Coal Seam Based on Deformation and Failure Characteristics of Surrounding Rock in Deep Roadway

Table 1

Matching materials in similar simulation test and their use levels.

Serial number	Rock stratum name	Seam height/mm	Proportion number	Amount/kg			Total/kg	Water quantity/kg	Remark
				River sand	Lime	Gypsum
1	Gritstone	100	4 : 0.6 : 0.4	115.2	17.2	11.6	144.0	14.4	Pavement stratum
2	Sandy shale	100	6 : 0.7 : 0.3	123.6	14.4	6.0	144.0	14.4
3	Fine sandstone	100	5 : 0.6 : 0.4	120.0	14.4	9.6	144.0	14.4
4	Medium-fine grained sandstone	120	5 : 0.6 : 0.4	144.0	17.9	11.4	172.8	17.4	Layer of floor roadway
5	Sandy shale	300	6 : 0.7 : 0.3	370.2	43.2	18.6	432.0	43.2	Roof layer
6	Mudstone	100	7 : 0.7 : 0.3	126.0	12.6	5.4	144.0	14.4
7	Coal seam	120	10 : 0.5 : 0.5	157.0	7.9	7.9	172.8	17.3
8	Mudstone	100	7 : 0.7 : 0.3	126.0	12.6	5.4	144.0	14.4
9	Fine sandstone	200	5 : 0.6 : 0.4	240.0	28.8	19.2	288.0	28.8
10	Mudstone	130	7 : 0.7 : 0.3	163.8	16.4	7.0	187.2	18.7
11	Fine sandstone	230	5 : 0.6 : 0.4	288.0	34.5	23.1	345.6	34.6
12	Fine sandstone	200	5 : 0.6 : 0.4	252.0	30.2	20.2	302.4	30.2
Accumulate		1,800	/	2,225.8	250.1	145.4	2,620.8	262.2