Study on the Support System Mechanism of Entry Roof with Roof Cutting Pressure Releasing Gob-Side Entry Retaining Technology

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Roof and floor layer</td><td class="align_center">Lithology</td><td class="align_center">Thickness (m)</td><td class="align_center">Lithologic characteristics</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Basic roof</td><td class="align_center">Fine sandstone</td><td class="align_center">3.88</td><td class="align_center">Light gray, gray. Subrounded. Horizontal bedding.</td></tr><tr><td class="align_left">Immediate roof</td><td class="align_center">Mudstone</td><td class="align_center">1.44</td><td class="align_center">Grayish black. Nearly uniform structure, fracture shell. Containing a small amount of kaolinite.</td></tr><tr><td class="align_left">Immediate floor</td><td class="align_center">Mudstone</td><td class="align_center">3.20</td><td class="align_center">Grayish black. Nearly uniform structure, fracture shell. Light weight.</td></tr><tr><td class="align_left">Basic floor</td><td class="align_center">Siltstone</td><td class="align_center">3.10</td><td class="align_center">Black gray. Massive, dense, uniform, hard, and complete. Horizontal bedding, containing a small amount of siderite nodules.</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Advances in Civil Engineering

tab2

Table 2

Table 2: Study on the Support System Mechanism of Entry Roof with Roof Cutting Pressure Releasing Gob-Side Entry Retaining Technology 