【摘要】：穿過(guò)深厚表土層的立井井筒的破裂對(duì)煤礦的安全生產(chǎn)造成嚴(yán)重威脅,弄清疏水沉降地層立井井壁破裂的原因,并提出針對(duì)性的修復(fù)治理方案來(lái)保障井筒的正常運(yùn)行,已到了刻不容緩的地步。 本文結(jié)合邱集煤礦的水文及地質(zhì)條件進(jìn)行分析,并通過(guò)水平側(cè)向荷載、豎向荷載為控制破壞荷載以及疏水沉降對(duì)井壁作用機(jī)理的模型試驗(yàn),得出豎向荷載為控制破壞荷載時(shí),試驗(yàn)結(jié)果與現(xiàn)場(chǎng)井壁的破壞形態(tài)相似；結(jié)合理論分析,得到底部含水層疏水引起上覆土體沉降而作用在外層井壁上的負(fù)摩擦力導(dǎo)致井壁的破壞。 通過(guò)數(shù)值計(jì)算軟件分析,得出內(nèi)層井壁豎向應(yīng)力的分布規(guī)律,表明卸壓槽法修復(fù)治理破裂井壁具有可行性。內(nèi)層井壁中開(kāi)切卸壓槽時(shí),可以有效衰減內(nèi)層井壁上的豎向應(yīng)力：開(kāi)切一道卸壓槽時(shí),內(nèi)層井壁中的豎向應(yīng)力衰減36.4%；開(kāi)切兩道卸壓槽時(shí),內(nèi)層井壁豎向應(yīng)力衰減56.5%。 本文以邱集煤礦為研究對(duì)象,針對(duì)邱集煤礦主井和副井井壁破壞的原因及破壞情況,提出了“卸壓槽法”對(duì)破壞井壁進(jìn)行修復(fù)治理,并對(duì)卸壓槽尺寸、壁后注漿壓力、注漿量、套筒加固等參數(shù)進(jìn)行了計(jì)算,并給出了施工方案,保證了修復(fù)治理方案的可行性。 為了解邱集礦修復(fù)治理后的效果,及時(shí)對(duì)井壁的安全狀況做出評(píng)估,本文通過(guò)監(jiān)測(cè)系統(tǒng)對(duì)修復(fù)后的井筒進(jìn)行了兩年多的動(dòng)態(tài)監(jiān)測(cè)。根據(jù)監(jiān)測(cè)結(jié)果分析,邱集礦主井和副井井壁破裂情況得到控制,說(shuō)明此方案修復(fù)治理疏水沉降地層破壞的立井井壁的方案是可行、有效的。 本文的研究成果對(duì)因井筒周圍土體底含失水而引起的的立井破裂的修復(fù)治理具有重要指導(dǎo)性的意義。
[Abstract]:The fracture of vertical shaft through deep topsoil layer poses a serious threat to the safety of coal mine production, clarifies the causes of shaft wall fracture in hydrophobic subsidence formation, and puts forward corresponding repair and treatment schemes to ensure the normal operation of wellbore. It has reached the point of urgency. In this paper, the hydrological and geological conditions of Qiuji Coal Mine are analyzed, and through the model test that the horizontal lateral load, vertical load is used to control the failure load and the mechanism of hydrophobic settlement on the shaft lining, it is concluded that when the vertical load is the control failure load, The test results are similar to those of the shaft lining in the field. Combined with the theoretical analysis, it is obtained that the drainage of the bottom aquifer causes the settlement of the overlying soil and the negative friction force acting on the outer shaft wall leads to the failure of the shaft wall. Through the analysis of numerical calculation software, the distribution law of vertical stress in inner layer shaft wall is obtained, which shows that it is feasible to repair and treat broken shaft wall by pressure relief groove method. When the unloading groove is cut in the inner sidewall, the vertical stress on the inner sidewall can be effectively attenuated: when a unloading groove is cut, the vertical stress in the inner sidewall decreases by 36.4%; When the two unloading grooves are cut, the vertical stress attenuation of the inner sidewall is 56.5%. In this paper, Qiuji Coal Mine is taken as the research object, and in view of the causes and failure conditions of the main shaft and the auxiliary shaft wall of Qiuji Coal Mine, the "unloading groove method" is put forward to repair the damaged shaft wall, and the size of the relief groove, the grouting pressure behind the wall and the amount of grouting are put forward. The parameters such as sleeve reinforcement are calculated, and the construction scheme is given to ensure the feasibility of the repair and treatment scheme. In order to understand the effect of Qiu Ji mine restoration and treatment and evaluate the safety of shaft lining in time, this paper carried out dynamic monitoring of the repaired wellbore for more than two years through the monitoring system. According to the analysis of the monitoring results, the fracture of the main shaft and the auxiliary shaft wall of Qiuji Mine is controlled, which shows that the scheme is feasible and effective to repair the shaft lining damaged by hydrophobic subsidence formation. The research results of this paper are of great significance to the repair and treatment of shaft fracture caused by the loss of water at the bottom of the soil around the wellbore.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD321

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