金属矿山
金屬礦山
금속광산
METAL MINE
2015年
8期
13-19
,共7页
初始地应力场%应力状态%动力灾害%危险区
初始地應力場%應力狀態%動力災害%危險區
초시지응력장%응력상태%동력재해%위험구
Initial ground stress field%Stress state%Dynamic disaster%Danger zone
从材料的强度理论出发,建立量化分析原岩应力场下岩体稳定性的评价方法,并分析了岩体初始稳定性与冲击地压动力灾害发生的相关性。以莫尔-库伦强度理论为基础,推导出莫尔-库伦应力(Wσ)评价指标,以反映岩石破坏前某一应力状态下岩石材料体接近极限破坏强度的程度。 Wσ在单轴压缩、单轴拉伸、三向受压、压缩-拉伸等岩石应力状态下,都能表现出应力状态接近极限的程度,Wσ越接近1,岩石越接近破坏极限,原岩稳定性越差。运用Wσ描述岩体初始地应力场状态能够表达出岩体所处应力状态与极限状态的接近程度,有助于判断初始应力场下的岩体稳定性。岩体初始稳定性越差的区域发生冲击地压动力灾害的概率越高,依据Wσ划分稳定、较稳定、中等稳定、较低稳定、低稳定5级稳定区,对原岩初始稳定性进行评价,为预测工程活动所引发的冲击地压等地质动力效应提供参考。
從材料的彊度理論齣髮,建立量化分析原巖應力場下巖體穩定性的評價方法,併分析瞭巖體初始穩定性與遲擊地壓動力災害髮生的相關性。以莫爾-庫倫彊度理論為基礎,推導齣莫爾-庫倫應力(Wσ)評價指標,以反映巖石破壞前某一應力狀態下巖石材料體接近極限破壞彊度的程度。 Wσ在單軸壓縮、單軸拉伸、三嚮受壓、壓縮-拉伸等巖石應力狀態下,都能錶現齣應力狀態接近極限的程度,Wσ越接近1,巖石越接近破壞極限,原巖穩定性越差。運用Wσ描述巖體初始地應力場狀態能夠錶達齣巖體所處應力狀態與極限狀態的接近程度,有助于判斷初始應力場下的巖體穩定性。巖體初始穩定性越差的區域髮生遲擊地壓動力災害的概率越高,依據Wσ劃分穩定、較穩定、中等穩定、較低穩定、低穩定5級穩定區,對原巖初始穩定性進行評價,為預測工程活動所引髮的遲擊地壓等地質動力效應提供參攷。
종재료적강도이론출발,건립양화분석원암응력장하암체은정성적평개방법,병분석료암체초시은정성여충격지압동력재해발생적상관성。이막이-고륜강도이론위기출,추도출막이-고륜응력(Wσ)평개지표,이반영암석파배전모일응력상태하암석재료체접근겁한파배강도적정도。 Wσ재단축압축、단축랍신、삼향수압、압축-랍신등암석응력상태하,도능표현출응력상태접근겁한적정도,Wσ월접근1,암석월접근파배겁한,원암은정성월차。운용Wσ묘술암체초시지응력장상태능구표체출암체소처응력상태여겁한상태적접근정도,유조우판단초시응력장하적암체은정성。암체초시은정성월차적구역발생충격지압동력재해적개솔월고,의거Wσ화분은정、교은정、중등은정、교저은정、저은정5급은정구,대원암초시은정성진행평개,위예측공정활동소인발적충격지압등지질동력효응제공삼고。
From the view of the mass intensity theory, the stability evaluation method of rock mass under the initial ground stress field is analyzed quantitatively,and the correlation between the initial stability of rock mass and the occurrence of underground dynamic disaster. Based on the Mohr-coulomb strength theory,the Mohr-coulomb stress ( Wσ) evaluation index are derived to reflect the level of rock approaching to the limit damage intensity under a stress state before damage. Wσcan repre-sent rock stress is close to the failure limit under uniaxial compression,uniaxial tension,three directional stress,and compres-sion-tension. The closer Wσis approaching to 1,the closer the rock is to the failure limit,meanwhile,the worse stability the rock has. The description of initial ground stress field of rock mass by Wσ can express the proximity extent of the rock mass stress state and the limit state,which is helpful to determine the rock mass stability under initial stress field. Where the rock mass has the worse initial stability owns a higher probability in occurrence of dynamic disaster of rock burst. According to the Wσ,5 sta-ble zones such as high stable,higher stable,med-high stable,lower stable,low stable level are divided to evaluate the initial stability of rock mass. The research can provide references for predicting the impact ground pressure and other geological dy-namic effect induced by the engineering activities.
