煤矿开采
煤礦開採
매광개채
COAL MINING TECHNOLOGY
2014年
6期
68-73
,共6页
强采动%近距离硐室群%应力演化%浆液扩散%注浆锚索
彊採動%近距離硐室群%應力縯化%漿液擴散%註漿錨索
강채동%근거리동실군%응력연화%장액확산%주장묘색
strong mining%close-distance caverns%stress development%slurry diffusion%grouting anchored-cable
以成庄煤矿井下甲、乙水仓及变电所等近距离硐室群为背景,采用FLAC3D 有限差分程序计算分析了2322工作面强采动下近距离硐室群围岩应力演化规律,采用UDEC离散元软件研究了近距离硐室群注浆加固机理,并提出了相应的加固对策。研究结果表明：成庄煤矿甲、乙水仓及变电所等近距离硐室群开挖后,围岩间垂直应力叠加效应较水平应力更为明显,但水平应力集中程度更高；2322工作面回采引起煤柱支承压力向底板传递,受煤柱高应力与底板高应力叠加作用,硐室变形特征将首先表现为强烈底鼓；相同注浆压力和水灰比条件下,沿注浆孔切向方向浆液的扩散半径大于沿径向的扩散半径；注浆锚索加固后,硐室群浅部围岩承载力大幅提高,工作面回采产生的强烈采动应力由深部转移至浅部,防止了深部岩体的进一步破坏。井下试验表明,注浆锚索加固后,2322工作面回采过程中各硐室围岩保持稳定,实现了强采动影响下近距离硐室群围岩变形的有效控制。
以成莊煤礦井下甲、乙水倉及變電所等近距離硐室群為揹景,採用FLAC3D 有限差分程序計算分析瞭2322工作麵彊採動下近距離硐室群圍巖應力縯化規律,採用UDEC離散元軟件研究瞭近距離硐室群註漿加固機理,併提齣瞭相應的加固對策。研究結果錶明：成莊煤礦甲、乙水倉及變電所等近距離硐室群開挖後,圍巖間垂直應力疊加效應較水平應力更為明顯,但水平應力集中程度更高；2322工作麵迴採引起煤柱支承壓力嚮底闆傳遞,受煤柱高應力與底闆高應力疊加作用,硐室變形特徵將首先錶現為彊烈底鼓；相同註漿壓力和水灰比條件下,沿註漿孔切嚮方嚮漿液的擴散半徑大于沿徑嚮的擴散半徑；註漿錨索加固後,硐室群淺部圍巖承載力大幅提高,工作麵迴採產生的彊烈採動應力由深部轉移至淺部,防止瞭深部巖體的進一步破壞。井下試驗錶明,註漿錨索加固後,2322工作麵迴採過程中各硐室圍巖保持穩定,實現瞭彊採動影響下近距離硐室群圍巖變形的有效控製。
이성장매광정하갑、을수창급변전소등근거리동실군위배경,채용FLAC3D 유한차분정서계산분석료2322공작면강채동하근거리동실군위암응력연화규률,채용UDEC리산원연건연구료근거리동실군주장가고궤리,병제출료상응적가고대책。연구결과표명：성장매광갑、을수창급변전소등근거리동실군개알후,위암간수직응력첩가효응교수평응력경위명현,단수평응력집중정도경고；2322공작면회채인기매주지승압력향저판전체,수매주고응력여저판고응력첩가작용,동실변형특정장수선표현위강렬저고；상동주장압력화수회비조건하,연주장공절향방향장액적확산반경대우연경향적확산반경；주장묘색가고후,동실군천부위암승재력대폭제고,공작면회채산생적강렬채동응력유심부전이지천부,방지료심부암체적진일보파배。정하시험표명,주장묘색가고후,2322공작면회채과정중각동실위암보지은정,실현료강채동영향하근거리동실군위암변형적유효공제。
Stress development rule of close-distance caverns influenced by 2322 face's strong mining was researched with FLAC3D , and the mechanism of grouting reinforcement for close-distance caverns was researched by applying UDEC software. Corresponding reinforce-ment countermeasure was put forward. Results showed that after close-distance caverns including water sumps and substation were exca-vated, superimposition effect of vertical stress of surrounding rock between caverns was more obvious than that of horizontal stress, but horizontal stress concentration degree was larger. Mining of 2322 face result into abutment pressure of coal-pillar moving to floor. Influenced by high stress superimposition of coal and floor, strong floor heave occurred in caverns. Under the condition of the same grouting pressure and ratio of water-to-ash, slurry diffusion radius along tangential direction of hole was larger than that along radial di-rection. Bearing capacity of caverns' shallow surrounding rock largely increased by reinforcing with grouting anchored-cable. High mining stress was transferred from deep to shallow location, which prevented further failure of deep rock. Underground test showed that after ap-plying grouting anchored-cable, surrounding rock of every cavern could keep stability and deformation of surrounding rock of close-dis-tance caverns influenced by strong mining was effectively controlled.
