Analysis of the Control Effect and Parameter Optimisation of Urban Surface Deformation in Underground Coal Mining with Solid Backfilling

Table 1

Description of test plans.

Factor	Face length	Compression ratio	Coal pillar width
Test 1	40	0.8	5
Test 2	50	0.8	5
Test 3	60	0.8	5
Test 4	70	0.8	5
Test 5	80	0.8	5
Test 6	60	0.3	5
Test 7	60	0.6	5
Test 8	60	0.7	5
Test 9	60	0.8	5
Test 10	60	0.9	5
Test 11	60	0.8	0
Test 12	60	0.8	5
Test 13	60	0.8	10
Test 14	60	0.8	15
Test 15	60	0.8	20