【摘要】：為解決紅慶梁礦雙巷留巷在一次采動后圍巖失穩(wěn)的問題,通過數(shù)值模擬對2次采動影響下的主應(yīng)力差值分布特征及留巷在不同應(yīng)力階段下的塑性區(qū)特征進行研究。結(jié)果表明:留巷圍巖主應(yīng)力差值在一次采動和二次采動影響下經(jīng)歷了5個階段,且呈現(xiàn)出階段性增加的特征;留巷圍巖在一次采動期間頂板塑性區(qū)由1.2 m增大到2.1 m,煤壁幫和煤柱幫塑性區(qū)由0.5 m分別增大到2.0 m和1.5m,在受二次采動應(yīng)力影響后塑性區(qū)的擴展呈非對稱的特點,頂板塑性區(qū)在煤柱幫側(cè)塑性破壞較多,破壞深度可達3.0 m,兩幫塑性破壞較對稱,塑性破壞范圍可達2.5 m。最終提出針對性的補強支護措施,現(xiàn)場應(yīng)用后圍巖頂?shù)装逡平繙p小了38%,兩幫移近量減小了36%,維護了巷道圍巖的穩(wěn)定。
[Abstract]:In order to solve the problem of rock instability of double roadway in Hongqingliang Mine after the first mining, the distribution characteristics of principal stress difference under the influence of two mining motions and the characteristics of plastic zone of retaining roadway under different stress stages were studied by numerical simulation. The results show that the difference of principal stress in the surrounding rock of roadway has experienced five stages under the influence of primary and secondary mining, and has the characteristics of increasing in stages. In the first mining period, the plastic zone of roof increases from 1.2 m to 2.1 m, and the plastic zone of coal wall and pillar increases from 0.5 m to 2.0 m and 1.5 m, respectively. Under the influence of secondary mining stress, the expansion of plastic zone is asymmetrical. The plastic zone of roof has more plastic failure on the side of coal pillar, the depth of failure can reach 3.0 m, the plastic failure of two sections is more symmetrical, and the range of plastic failure can reach 2.5 m. Finally, the corresponding reinforcement and support measures are put forward. After the field application, the rock roof and floor movement is reduced by 38 percent, and the two sides is reduced by 36 percent, thus maintaining the stability of the surrounding rock of the roadway.
【作者單位】： 中國礦業(yè)大學(xué)(北京)資源與安全工程學(xué)院;
【基金】：國家自然科學(xué)基金重點資助項目(51234006,51234005)
【分類號】：TD353
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本文編號：2324328