Stability Analysis of Surrounding Rock Mass and Numerical Simulation of the Exploitation Process in Underground Stope
The redistribution of stress caused by excavation procedure is one of the most important reasons leading to surrounding rock deformation and fracture in underground engineering. Ka Fang polymetallic mining field of Yunnan Tin Industry Corp was chosen as the study object, the finite element software ADINA, through which defining the element birth and death to confirm the excavation sequence, was used to simulate the exploitation and filling processes. In order to analyze the stability of surrounding rock, the distribution and variation rules of surro.unding rocks stress field and displacement field were got. The research indicated that the stress and the displacement are gradually increased with the excavation advancing s~p by step. Until exploitation was finished, The maximum compress stress and the maximum tension stress of artificial pillar are -3.1 MPa and 0.38 MPa separately, the maximum compress stress of the upper and the footwall surrounding rock are -41.6 MPa and -36.6 MPa, the maximum tension stress are 1.22MPa and 1.62 MPa, which are small than the ultimate stress of surrounding rock At the same time, the maximum settlement and floor heave reach 39.1 nun and 10.9 mm separately. After filling the mined-out area by gangue, the maximum compress stress of artificial pillar is -3.19 MPa, and no tension stress, the maximum compress stress of the upper and the footwall surrounding rock decrease into -31.7 MPa and -27.2 MPa separately, the maximum tension stresses fall to 0.69 MPa and 0.77 MPa, the maximum settlement and floor heave arrive 54.3 mm, 10.4ram. Because of backfilled gangue, the stress of surrounding rock and the floor heave are distinctly decreased, and artificial pillar supporting capacity is also strengthened. The result is that the stability of surrounding rock gets improvement. The conclusion is also meaningful for guiding the construction of similar projects.
underground engineering stability analysis stability of surrounding rock ADINA finite element safety
MA Rong ZHOU Keping CHEN Qingfa
Key Laboratory of Deep Mining & Disaster Control,School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
2253-2258
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）