CAJ | 학술논문

竖井作为井下开采矿山的咽喉工程,在矿山的安全生产中起着举足轻重的作用.金川二矿区14行主力回风井位于矿体下盘,井深715.5m,穿过的工程围岩有超基性岩、花岗岩、大理岩、辉绿岩等以及F_207断层.该风井于1999年10月开工下掘, 2002年投入使用,2005年3月突然跨塌.本文根据现场调查和数值模拟,分析了风井变形破坏的特征和机制.发现主要有井壁错动开裂、片冒、冒落物冲击井壁等几种破坏形式,并得出在采动影响下最易在以下几个位置发生破坏:(1)井筒上部(0～200m),易出现拉裂破坏和围岩整体剪切滑动;(2)F_(207)断层及其上下接触部位(200～220m),井筒很有可能在此处发生上下错动,从而导致剪切破坏;(3)井筒中部(360～460m),受采动影响较大,可能发生鼓肚子破坏;(4)井筒下部F_(16)断层影响带(井底以上50m),岩体在采动影响下将发生松动,从而导致在结构面穿插部位可能发生冒落.
수정작위정하개채광산적인후공정,재광산적안전생산중기착거족경중적작용.금천이광구14행주력회풍정위우광체하반,정심715.5m,천과적공정위암유초기성암、화강암、대리암、휘록암등이급F_207단층.해풍정우1999년10월개공하굴, 2002년투입사용,2005년3월돌연과탑.본문근거현장조사화수치모의,분석료풍정변형파배적특정화궤제.발현주요유정벽착동개렬、편모、모락물충격정벽등궤충파배형식,병득출재채동영향하최역재이하궤개위치발생파배:(1)정통상부(0～200m),역출현랍렬파배화위암정체전절활동;(2)F_(207)단층급기상하접촉부위(200～220m),정통흔유가능재차처발생상하착동,종이도치전절파배;(3)정통중부(360～460m),수채동영향교대,가능발생고두자파배;(4)정통하부F_(16)단층영향대(정저이상50m),암체재채동영향하장발생송동,종이도치재결구면천삽부위가능발생모락.
As the access tunnel of underground mining, the mine shaft plays an important role in safety production. This paper examines the No.14 shaft that located on the support of ore body in Jinchang No.2 mine area. Its depth if 715.5 m. It intersected with the F_207 fault. The surrounding rocks included ultramafic rock, granite, marble and dolerite. The shaft excavation was commenced in October 1999 and completed for using in 2002. It collapsed in March 2005. Based on the spot investigated data and numerical simulation method, this paper presents the deformation characteristics and damage mechanism of the No.14 shaft. The results show that there were such several damaged modes such as displacement and crack of shaft wall, fall, and breakage of shaft wall caused by impacting of falling substance. The convergence deformation of its surrounding rock was characterized by large deformation, rapid and long duration. Furthermore, the damage mechanism of the No.14 shaft was analyzed by numerical simulation. The result stated that the failures appeared possibly on the following positions of the shaft influenced by underground mining: (1)the upper part (0 to 200 m apart from the shaft head), where tension failure and shearing slide might happen. (2) the F_(207) fault zone (200 to 220 m apart from the shaft head), where the fault displacement might happen to induce shearing failure of the shaft. (3) the middle part (360 to 460 m apart from the shaft head), where the bulging damage might appear because of strong mining effect. (4) the influencing zone of the F_(16) fault (0 to 50 m apart from the shaft bottom), where the rock would loose due to the influence of the underground mining, which might induce the appearance of falling at the position of discontinuity plane traversing the shaft.