采矿与安全工程学报
採礦與安全工程學報
채광여안전공정학보
JOURNAL OF MINING AND SAFETY ENGINEERING
2014年
4期
499-505
,共7页
王晓振%许家林%朱卫兵%王欢
王曉振%許傢林%硃衛兵%王歡
왕효진%허가림%주위병%왕환
松散承压含水层%载荷传递%关键层复合破断%压架突水
鬆散承壓含水層%載荷傳遞%關鍵層複閤破斷%壓架突水
송산승압함수층%재하전체%관건층복합파단%압가돌수
unconsolidated confined aquifer%load transfer%key stratum compound breakage%support crushing and water inrush
以松散承压含水层下采煤压架突水灾害防治问题为工程背景,基于含水层载荷传递机理设计了专门的模拟实验装置,就松散承压含水层赋存特征对其载荷传递特性及关键层复合破断的影响进行了研究。结果表明:松散承压含水层骨架颗粒粒径越大,组分越单一,含水层的流动补给性能越好,作用在基岩顶部的载荷较大,覆岩越易发生复合破断,易导致压架突水事故;骨架颗粒粒径越小,粒度组分复杂,含水层流动补给性能越差,作用在基岩顶界面的载荷易随采动降低,含水层载荷传递系数小,覆岩关键层自下而上逐层破断,不易导致压架突水事故。研究形成了含水层载荷传递系数的确定方法,在祁东煤矿的开采条件下,洪冲积扇区域含水层的载荷传递系数应为0.83~0.94,漫滩沉积区域可取0.69~0.71。
以鬆散承壓含水層下採煤壓架突水災害防治問題為工程揹景,基于含水層載荷傳遞機理設計瞭專門的模擬實驗裝置,就鬆散承壓含水層賦存特徵對其載荷傳遞特性及關鍵層複閤破斷的影響進行瞭研究。結果錶明:鬆散承壓含水層骨架顆粒粒徑越大,組分越單一,含水層的流動補給性能越好,作用在基巖頂部的載荷較大,覆巖越易髮生複閤破斷,易導緻壓架突水事故;骨架顆粒粒徑越小,粒度組分複雜,含水層流動補給性能越差,作用在基巖頂界麵的載荷易隨採動降低,含水層載荷傳遞繫數小,覆巖關鍵層自下而上逐層破斷,不易導緻壓架突水事故。研究形成瞭含水層載荷傳遞繫數的確定方法,在祁東煤礦的開採條件下,洪遲積扇區域含水層的載荷傳遞繫數應為0.83~0.94,漫灘沉積區域可取0.69~0.71。
이송산승압함수층하채매압가돌수재해방치문제위공정배경,기우함수층재하전체궤리설계료전문적모의실험장치,취송산승압함수층부존특정대기재하전체특성급관건층복합파단적영향진행료연구。결과표명:송산승압함수층골가과립립경월대,조분월단일,함수층적류동보급성능월호,작용재기암정부적재하교대,복암월역발생복합파단,역도치압가돌수사고;골가과립립경월소,립도조분복잡,함수층류동보급성능월차,작용재기암정계면적재하역수채동강저,함수층재하전체계수소,복암관건층자하이상축층파단,불역도치압가돌수사고。연구형성료함수층재하전체계수적학정방법,재기동매광적개채조건하,홍충적선구역함수층적재하전체계수응위0.83~0.94,만탄침적구역가취0.69~0.71。
In response to the issue of prevention of support crushing and water inrush disaster during mining under unconsolidated confined aquifer, a specialized simulation experiment set based on the mechanism of aquifer load transfer has been designed and the influence of occurrence characteristic of unconsolidated confined aquifer on its property of load transfer and key stratum compound breakage has been studied. The result indicates that load transfer effect on the unconsolidated confined aquifer is closely related to its framework grain characteristic. The larger the skeleton granule diameter is, the simpler the component is, and the better the property of flowing and replenishment is. Therefore it can transfer load to top overburden continuously and uniformly and make the load on top of overburden larger, which easily causes overburden integral breakage and results in support crushing and water in-rush disaster. While the smaller the framework grain diameter is, the more complex the component is, and the poorer the property of flowing and replenishment is. Load applying on top of overburden can reduce during mining and aquifer load transfer coefficient can become smaller. Therefore, key stratum breaks layer by layer and hardly causes support crushing and water inrush. Calculating method of load transfer coefficient of unconsolidated confined aquifer has been confirmed. Load transfer coefficient should be 0.83 to 0.94 in alluvial and pluvial fan area of Qidong coal mine, while non-alluvial and pluvial fan area should be 0.69 to 0.71.