邱集煤矿井筒破裂机理分析及修复加固设计

发布时间：2019-05-24 03:25

【摘要】：穿过深厚表土层的立井井筒的破裂对煤矿的安全生产造成严重威胁,弄清疏水沉降地层立井井壁破裂的原因,并提出针对性的修复治理方案来保障井筒的正常运行,已到了刻不容缓的地步。本文结合邱集煤矿的水文及地质条件进行分析,并通过水平侧向荷载、竖向荷载为控制破坏荷载以及疏水沉降对井壁作用机理的模型试验,得出竖向荷载为控制破坏荷载时,试验结果与现场井壁的破坏形态相似；结合理论分析,得到底部含水层疏水引起上覆土体沉降而作用在外层井壁上的负摩擦力导致井壁的破坏。通过数值计算软件分析,得出内层井壁竖向应力的分布规律,表明卸压槽法修复治理破裂井壁具有可行性。内层井壁中开切卸压槽时,可以有效衰减内层井壁上的竖向应力：开切一道卸压槽时,内层井壁中的竖向应力衰减36.4%；开切两道卸压槽时,内层井壁竖向应力衰减56.5%。本文以邱集煤矿为研究对象,针对邱集煤矿主井和副井井壁破坏的原因及破坏情况,提出了“卸压槽法”对破坏井壁进行修复治理,并对卸压槽尺寸、壁后注浆压力、注浆量、套筒加固等参数进行了计算,并给出了施工方案,保证了修复治理方案的可行性。为了解邱集矿修复治理后的效果,及时对井壁的安全状况做出评估,本文通过监测系统对修复后的井筒进行了两年多的动态监测。根据监测结果分析,邱集矿主井和副井井壁破裂情况得到控制,说明此方案修复治理疏水沉降地层破坏的立井井壁的方案是可行、有效的。本文的研究成果对因井筒周围土体底含失水而引起的的立井破裂的修复治理具有重要指导性的意义。
[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.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD321

【参考文献】