摘要
为了得到采动下海底采场顶板底部裂隙的扩展规律,依据力学特征将顶板沉降过程进行分段建模,并采用ABAQUS模拟了顶板底部裂隙的扩展过程。结果表明,在顶板沉降初始阶段,裂隙面两侧应力对称,裂隙沿垂直拉伸应力方向扩展;在充填体与顶板相互作用阶段,裂隙面两侧应力不对称,裂隙朝着拉伸应力较大一侧发生转向。三山岛金矿新立矿区某采场顶板底部不同位置处裂隙扩展过程分析结果表明,裂隙转向主要由不对称拉伸应力造成,且越远离岩梁中心的裂隙,垂直扩展长度越小,越早发生转向,处在离岩梁中心10 m位置处的裂隙,垂直扩展长度达到8 m后发生转向;处在离岩梁中心20 m位置处的裂隙,垂直扩展长度仅2.5 m后发生转向,处在岩梁中心的裂隙不发生转向。
In order to obtain the crack growth law for the bottom of the seabed stope under mining, the roof settlement process in stages was modeled according to the mechanical characteristics, and the growth of cracks at the bottom of roof was simulated by ABAQUS. It is found that at the initial stage of roof settlement, the stress on the both sides of the crack surface is symmetrical, and the cracks grow along the vertical direction of tensile stress;while at the stage of interaction between the filling body and the roof, the stress on the both sides of the crack surface is asymmetrical, and the cracks will grow towards the side with a higher tensile stress. The extended finite element analysis for crack growth at different positions at the bottom of the roof of a stope in Xinli mining area of Sanshandao Gold Mine shows that the crack turning is mainly attributed to asymmetric tensile stress. When the crack is far away from the center of rock beam, there will be a shorter vertical length and the crack turning will occur sooner. As the crack is 10 m away from the center of the rock beam, the crack turning will occur after the vertical growth reaches 8 m. While as the crack is 20 m away from the center of rock beam, the crack turning will occur after the vertical growth reaches only 2.5 m. However, the crack turning will not occur on the center of the rock beam.
作者
王春元
刘志祥
张双侠
WANG Chun-yuan;LIU Zhi-xiang;ZHANG Shuang-xia(School of Resources&Safety Engineering,Central South University,Changsha 410083,Hunan,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2022年第4期11-16,共6页
Mining and Metallurgical Engineering
基金
山东省重大科技创新工程资助项目(2019SDZY05)
国家自然科学基金(51974359,51674288)。
关键词
单裂隙扩展
充填采场
非对称应力
扩展有限元法
single crack growth
backfilled stope
asymmetric stress
extended finite element method
