金属矿山
金屬礦山
금속광산
METAL MINE
2015年
2期
145-150
,共6页
红砂岩%剪切蠕变%潜在滑移带%边坡%渐进式
紅砂巖%剪切蠕變%潛在滑移帶%邊坡%漸進式
홍사암%전절연변%잠재활이대%변파%점진식
Red sandstone%Shear creep%Potential slip area%Slope%Progressive
以标准红砂岩试样为研究对象,运用自行研制开发的软弱煤岩材料剪切蠕变实验装置结合自行开发的煤岩细观力学特性测控软件,对处于不同载荷水平作用下的红砂岩试样剪切蠕变力学特性进行了系统的研究,并基于试验结果尝试解释了一些边坡失稳发生时的现象。结果表明：载荷大小对红砂岩剪切蠕变力学特性具有明显的影响,直接决定着加速剪切蠕变阶段的有无、试样的破坏与否和试验时间对其剪切蠕变力学特性的影响程度；存在2个特殊的临界剪切蠕变载荷值τ1、τ2,它们将红砂岩剪切蠕变类型分为3种,即肯定不破坏、不一定破坏和肯定破坏；红砂岩试样破裂带的形成过程表现为渐进式,破坏过程表现为渐进式与突发式结合,破裂面附近区域为裂纹结构丰富区且该面为非平直剪切面；不同载荷水平作用下岩石剪切蠕变力学特性可以用来解释边坡失稳发育过程中的现象,认为边坡内潜在滑移带内岩石发生的剪切蠕变破坏是边坡发生失稳的力学机理。
以標準紅砂巖試樣為研究對象,運用自行研製開髮的軟弱煤巖材料剪切蠕變實驗裝置結閤自行開髮的煤巖細觀力學特性測控軟件,對處于不同載荷水平作用下的紅砂巖試樣剪切蠕變力學特性進行瞭繫統的研究,併基于試驗結果嘗試解釋瞭一些邊坡失穩髮生時的現象。結果錶明：載荷大小對紅砂巖剪切蠕變力學特性具有明顯的影響,直接決定著加速剪切蠕變階段的有無、試樣的破壞與否和試驗時間對其剪切蠕變力學特性的影響程度；存在2箇特殊的臨界剪切蠕變載荷值τ1、τ2,它們將紅砂巖剪切蠕變類型分為3種,即肯定不破壞、不一定破壞和肯定破壞；紅砂巖試樣破裂帶的形成過程錶現為漸進式,破壞過程錶現為漸進式與突髮式結閤,破裂麵附近區域為裂紋結構豐富區且該麵為非平直剪切麵；不同載荷水平作用下巖石剪切蠕變力學特性可以用來解釋邊坡失穩髮育過程中的現象,認為邊坡內潛在滑移帶內巖石髮生的剪切蠕變破壞是邊坡髮生失穩的力學機理。
이표준홍사암시양위연구대상,운용자행연제개발적연약매암재료전절연변실험장치결합자행개발적매암세관역학특성측공연건,대처우불동재하수평작용하적홍사암시양전절연변역학특성진행료계통적연구,병기우시험결과상시해석료일사변파실은발생시적현상。결과표명：재하대소대홍사암전절연변역학특성구유명현적영향,직접결정착가속전절연변계단적유무、시양적파배여부화시험시간대기전절연변역학특성적영향정도；존재2개특수적림계전절연변재하치τ1、τ2,타문장홍사암전절연변류형분위3충,즉긍정불파배、불일정파배화긍정파배；홍사암시양파렬대적형성과정표현위점진식,파배과정표현위점진식여돌발식결합,파렬면부근구역위렬문결구봉부구차해면위비평직전절면；불동재하수평작용하암석전절연변역학특성가이용래해석변파실은발육과정중적현상,인위변파내잠재활이대내암석발생적전절연변파배시변파발생실은적역학궤리。
Taking the standard red sandstone samples as research objects,both the self-designed shear creep experimen-tal device of coal or weak rock and the monitor software of coal or rock micromechanics properties were used to make the sys-tematic studies on shear creep properties of red sandstone under different load levels. The phenomena and mechanisms of slope stability occurrence are trial to be revealed based on the conclusions from experiments. The results show:load levels have a sig-nificant effect on the shear creep mechanical properties of red sandstone,which will mainly determine the presence of acceler-ated shear creep stage or not,the destruction of the sample or not and the affect extent of creep test time on mechanical proper-ties. There are two special shear creep stress,τ1、τ2 ,which divides the shear creep of sandstone into three types,certainly not fracture,uncertainly fracture and certainly fracture. The formation process of damage area of red sandstone was showed as a pro-gressive type,and the damage process was showed as a progressive type combined with burst type. There is crack-rich area near the fracture surface,and the fracture surface is not flat shear plane in structure. Shear creep properties of red sandstone under different load may be used to reveal the phenomena and mechanisms of slope stability occurrence. It is considered that rock shear creep of potential slip area in slope is the physical mechanism of slope instability.
