煤矿开采
煤礦開採
매광개채
COAL MINING TECHNOLOGY
2014年
3期
23-28,8
,共7页
断层构造%初始地应力%系统因素%三维回归反演法%应力活跃区
斷層構造%初始地應力%繫統因素%三維迴歸反縯法%應力活躍區
단층구조%초시지응력%계통인소%삼유회귀반연법%응력활약구
fault tectonic%initial geo-stress%system factor%3-d regression method%stress active zone
为了能给深部巷道开挖工程安全穿过大断层构造区提供有价值的参考数据，采用套孔应力解除法对大断层工程域内的地应力进行了实测。基于工程域内地质特征，以实测地应力作为初始条件，建立系统因素影响下的三维有限差分数值模型，利用三维回归反演方法获得该工程域内的精细地应力场。研究结果表明：反演地应力场与实测地应力场吻合较好，其最大误差约为14.31％；在预开挖巷道位置（埋深800m），大断层内部应力弱化，其与应力集中的断层边界具有3.0MPa的应力差，使该断层附近成为应力活跃区，也即岩体破裂发育区；水平主应力方向在应力活跃区发生约3.5°偏转，这极大地改变了岩体应力状态，增大开挖扰动下岩体破坏可能性，因此需对应力活跃区内巷道进行强支护管理。
為瞭能給深部巷道開挖工程安全穿過大斷層構造區提供有價值的參攷數據，採用套孔應力解除法對大斷層工程域內的地應力進行瞭實測。基于工程域內地質特徵，以實測地應力作為初始條件，建立繫統因素影響下的三維有限差分數值模型，利用三維迴歸反縯方法穫得該工程域內的精細地應力場。研究結果錶明：反縯地應力場與實測地應力場吻閤較好，其最大誤差約為14.31％；在預開挖巷道位置（埋深800m），大斷層內部應力弱化，其與應力集中的斷層邊界具有3.0MPa的應力差，使該斷層附近成為應力活躍區，也即巖體破裂髮育區；水平主應力方嚮在應力活躍區髮生約3.5°偏轉，這極大地改變瞭巖體應力狀態，增大開挖擾動下巖體破壞可能性，因此需對應力活躍區內巷道進行彊支護管理。
위료능급심부항도개알공정안전천과대단층구조구제공유개치적삼고수거，채용투공응력해제법대대단층공정역내적지응력진행료실측。기우공정역내지질특정，이실측지응력작위초시조건，건립계통인소영향하적삼유유한차분수치모형，이용삼유회귀반연방법획득해공정역내적정세지응력장。연구결과표명：반연지응력장여실측지응력장문합교호，기최대오차약위14.31％；재예개알항도위치（매심800m），대단층내부응력약화，기여응력집중적단층변계구유3.0MPa적응력차，사해단층부근성위응력활약구，야즉암체파렬발육구；수평주응력방향재응력활약구발생약3.5°편전，저겁대지개변료암체응력상태，증대개알우동하암체파배가능성，인차수대응력활약구내항도진행강지호관리。
In order to provide valuable reference for deep roadway excavating through large fault tectonic area , geo-stress was tested by trepanning stress relief method.Taking measured geo-stresses as initial condition , 3-d finite difference numerical simulation mode was set up.Elaborate geo -stress field of this area was obtained by3-d regression method.Results showed that regressed geo-stress filed was fit for that from actual test, maximum error was only about 14.31%.At pre-excavate roadway location ( buried depth was 800 m) , inner stress of large fault weakened , whose stress difference from stress-concentrated fault boundary was 3.0MPa.This made fault vicinity be-come stress active zone, that was, cracks development zone.Direction of horizontal principal stress deviated 3.5°in stress active zone, which largely changed rock stress state and added rock damage possibility influenced by mining .Therefore, reinforcing roadway support-ing in stress active zone was necessary.
