Quantitative Identification of the Water Resistance Capacity of Composite Strata in Mining Coal Seam Floors

<table class="table-group" id="tab12"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left">Waterproof ability grade</td><td class="align_center">Extremely weak (I)</td><td class="align_center">Weak (II)</td><td class="align_center">Medium (III)</td><td class="align_center">Strong (IV)</td><td class="align_center">Very strong (V)</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Level eigenvalue</td><td class="align_center"><span style="width: 43.2344ptpx;"><svg height="9.2729pt" id="M85" style="vertical-align:-0.6370001pt" version="1.1" viewbox="-0.0498162 -8.6359 43.2344 9.2729" width="43.2344pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M962 650H739L732 622L760 619C812 613 819 604 798 552C760 457 671 267 606 131H604L511 638H480L237 131H233L183 554C177 607 183 614 226 619L248 622L257 650H24L17 622C88 615 92 611 103 524L173 -11H203L450 491H453L543 -11H575L839 529C882 609 886 613 953 622L962 650Z"></path></g><g transform="matrix(.013,0,0,-0.013,16.301,0)"><path d="M512 -3V55L134 254V256L512 456V514L75 281V230L512 -3Z"></path></g><g transform="matrix(.013,0,0,-0.013,27.564,0)"><path d="M412 140C382 77 369 73 315 73H129L270 222C362 320 402 379 402 466C402 571 322 635 234 635C177 635 130 609 99 576L42 495L64 475C90 514 133 568 201 568C274 568 318 519 318 435C318 349 255 267 193 193C144 135 87 78 32 23V0H405C417 45 427 89 440 131L412 140Z"></path></g><g transform="matrix(.013,0,0,-0.013,33.804,0)"><path d="M113 -12C146 -12 170 11 170 46C170 78 146 103 114 103S58 78 58 46C58 11 82 -12 113 -12Z"></path></g><g transform="matrix(.013,0,0,-0.013,36.768,0)"><path d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 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<div>Classification standards for water resistance.</div>

Geofluids

tab12

Table 12

Table 12: Quantitative Identification of the Water Resistance Capacity of Composite Strata in Mining Coal Seam Floors 