發(fā)布時(shí)間：2018-04-08 09:08

  本文選題：極限分析　切入點(diǎn)：失穩(wěn)機(jī)理　出處：《湖南科技大學(xué)》2015年碩士論文

【摘要】：本文以江西豐龍礦北翼-800m采區(qū)回風(fēng)石門作為工程背景,計(jì)算了深部巷道圍巖壓力,分析了深部巷道圍巖失穩(wěn)原因,在此基礎(chǔ)上提出分步聯(lián)合支護(hù)方案,實(shí)踐表明分步聯(lián)合支護(hù)方案效果良好,可較好地控制圍巖變形。構(gòu)建深埋巷道圍巖破壞機(jī)制,由“向下坍落的楔形坍落體+以頂角為圓心的轉(zhuǎn)動(dòng)圓弧體+兩個(gè)平動(dòng)三角形體”構(gòu)成。得到此破壞模式圍巖壓力極限分析上限解的目標(biāo)函數(shù)及其約束條件,采用優(yōu)化方法得到圍巖壓力的優(yōu)化解。并采用線性Mohr-Coulomb破壞準(zhǔn)則對(duì)分析各個(gè)參數(shù)對(duì)圍巖壓力的影響。通過X射線衍射實(shí)驗(yàn)以及分析現(xiàn)場(chǎng)實(shí)際情況可知,膨脹性軟巖礦物產(chǎn)生的膨脹壓力,圍巖四周十分復(fù)雜應(yīng)力場(chǎng)以及不合理的支護(hù)方案,這些對(duì)維護(hù)巷道圍巖的穩(wěn)定都極為不利。根據(jù)實(shí)際情況提出分步聯(lián)合支護(hù)技術(shù)并論述其優(yōu)越性,通過“應(yīng)力恢復(fù)、圍巖增強(qiáng)、固結(jié)修復(fù)、應(yīng)力轉(zhuǎn)移”4項(xiàng)基本對(duì)策,可以更好地適應(yīng)深部巖體的變形要求。采用流變理論對(duì)二次支護(hù)時(shí)間的選擇進(jìn)行了探討�；谒蓜�(dòng)圈理論及懸吊理論初步設(shè)計(jì)了錨桿、錨索的參數(shù),采用錨固復(fù)合承載體模型驗(yàn)證錨桿參數(shù)的合理性。對(duì)錨索的間排距、直徑以及長(zhǎng)度等參數(shù)進(jìn)行了優(yōu)化設(shè)計(jì),進(jìn)行正交試驗(yàn)。分析試驗(yàn)數(shù)據(jù),最終取A2 B2 C1(錨索長(zhǎng)度7m,直徑17.80mm,間排距1.6m×1.6m)為最佳方案。針對(duì)3種不同支護(hù)方案(方案1“錨噴+注漿支護(hù)”支護(hù);方案2“錨噴+全斷面錨索、注漿”一次聯(lián)合支護(hù);方案3“錨噴+全斷面錨索、注漿”分步聯(lián)合支護(hù)),運(yùn)用FLAC3D軟件對(duì)支護(hù)效果進(jìn)行數(shù)值模擬。結(jié)果表明:方案2和方案3的支護(hù)效果好于方案1,特別是在方案1中出現(xiàn)底鼓量大的問題得到了改善。分步聯(lián)合支護(hù)使得巷道圍巖變形得到了很好的控制,允許圍巖初期產(chǎn)生一定的變形,避免了錨桿錨索同時(shí)支護(hù)導(dǎo)致承載不同步的問題,是比一次聯(lián)合支護(hù)更加合理的支護(hù)方式。將分步聯(lián)合支護(hù)應(yīng)用于工程實(shí)踐,通過對(duì)巷道圍巖的壓力以及變形量的監(jiān)測(cè),結(jié)果表明:圍巖壓力在25~30天左右趨于穩(wěn)定;實(shí)施了分步聯(lián)合支護(hù)的巷道圍巖變形量較小,二次支護(hù)90天后圍巖變形量基本趨于穩(wěn)定;而原方案支護(hù)段圍巖變形量較大,且變形量有繼續(xù)發(fā)展的趨勢(shì)。以上說明該支護(hù)方式有效控制圍巖變形,維護(hù)了巷道圍巖長(zhǎng)期穩(wěn)定。
[Abstract]:Based on the backwind Shimen in the north wing of Fenglong Coal Mine, Jiangxi Province, this paper calculates the surrounding rock pressure of deep roadway, analyzes the reasons of rock instability in deep roadway, and puts forward a combined support scheme.The practice shows that the step-by-step combined support scheme has good effect and can control the deformation of surrounding rock.The failure mechanism of surrounding rock in deep buried roadway is composed of "two translational triangles of rotary arc body with the center of the top angle".The objective function and its constraint conditions of upper limit solution for the ultimate analysis of surrounding rock pressure in this failure mode are obtained, and the optimal solution of surrounding rock pressure is obtained by using the optimization method.The influence of each parameter on surrounding rock pressure is analyzed by linear Mohr-Coulomb failure criterion.Through the X-ray diffraction experiment and the analysis of the actual situation in the field, it can be seen that the swelling pressure produced by the swelling soft rock mineral, the very complex stress field around the surrounding rock and the unreasonable supporting scheme are all extremely disadvantageous to the maintenance of the stability of the surrounding rock of the roadway.According to the actual situation, this paper puts forward the step by step combined support technology and discusses its superiority. Through the four basic countermeasures of "stress recovery, surrounding rock enhancement, consolidation repair and stress transfer", the technology can better meet the deformation requirements of deep rock mass.The selection of secondary support time is discussed by rheological theory.Based on the loosening ring theory and suspension theory, the parameters of anchor rod and cable are preliminarily designed, and the rationality of anchor rod parameters is verified by Anchorage composite bearing body model.The parameters such as spacing, diameter and length of anchor cable were optimized and orthogonal test was carried out.After analyzing the test data, the best scheme is A2B 2C 1 (Anchorage cable length 7 m, diameter 17.80 mm, spacing 1.6 m 脳 1.6 m).In view of three different support schemes (scheme 1 "bolting and shotcrete grouting support", scheme 2 "Anchorage and shotcrete full section anchor cable, grouting" primary combined support, scheme 3 "Anchorage shotcrete full section anchor cable,"Grouting "step-by-step combined support, FLAC3D software is used to simulate the support effect."The results show that the support effect of scheme 2 and scheme 3 is better than that of scheme 1, especially the problem of large floor heave in scheme 1 is improved.Step by step combined support makes the deformation of surrounding rock of roadway well controlled, allowing certain deformation of surrounding rock at the initial stage, and avoiding the problem of simultaneous support of anchor and anchor cable, which is a more reasonable supporting method than primary combined support.Through monitoring the pressure and deformation of surrounding rock of roadway, the results show that the pressure of surrounding rock tends to be stable in 2530 days, and the deformation amount of surrounding rock of roadway with stepwise combined support is small.After 90 days of secondary support, the deformation of surrounding rock tends to be stable, while that of the original support section is large, and the deformation tends to continue to develop.The above results show that the supporting method can effectively control the deformation of surrounding rock and maintain the long-term stability of roadway surrounding rock.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD353

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