【摘要】：為解決紅慶梁礦雙巷留巷在一次采動(dòng)后圍巖失穩(wěn)的問(wèn)題,通過(guò)數(shù)值模擬對(duì)2次采動(dòng)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(jìn)行研究。結(jié)果表明:留巷圍巖主應(yīng)力差值在一次采動(dòng)和二次采動(dòng)影響下經(jīng)歷了5個(gè)階段,且呈現(xiàn)出階段性增加的特征;留巷圍巖在一次采動(dòng)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(dòng)應(yīng)力影響后塑性區(qū)的擴(kuò)展呈非對(duì)稱(chēng)的特點(diǎn),頂板塑性區(qū)在煤柱幫側(cè)塑性破壞較多,破壞深度可達(dá)3.0 m,兩幫塑性破壞較對(duì)稱(chēng),塑性破壞范圍可達(dá)2.5 m。最終提出針對(duì)性的補(bǔ)強(qiáng)支護(hù)措施,現(xiàn)場(chǎng)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(hù)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(guó)礦業(yè)大學(xué)(北京)資源與安全工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金重點(diǎn)資助項(xiàng)目(51234006,51234005)
【分類(lèi)號(hào)】：TD353
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本文編號(hào)：2324328