许疃煤矿改扩建工程冻结井可缩性井壁接头的研究与应用

发布时间：2019-05-17 16:48

【摘要】：自二十世纪80年代以来,我国安徽两淮、江苏徐州、河南永夏、山东兖州和黑龙江东荣等矿区相继发生大量立井井壁破裂事故,现行对井壁破裂原因已达成共识,即破裂井壁所穿过表土层的底部含水层直接覆盖在风化基岩段之上,缺乏隔水层,由于底部含水层疏水沉降产生作用于井筒之上的竖向附加力(负摩擦力)是造成立井井壁破裂的主要原因。许疃煤矿改扩建工程的新主井和北风井均穿越此类疏水沉降地层,因此在井壁结构设计中,应考虑竖向附加力的影响以预防井壁破裂。为此,本文采用理论分析、模型试验和数值模拟相结合的研究手段,对许疃煤矿改扩建工程冻结井可缩性井壁接头进行研究,研究内容和成果如下： (1)根据冻结井可缩性井壁接头的设计原则和方法,针对许疃煤矿新主井和北风井,各设置竖向可缩性井壁接头1个,分别位于累深357m和353m层位,并得到了冻结井可缩性井壁接头的结构参数。 (2)采用模型试验方法,对可缩性井壁接头进行竖向、侧向和三轴加载模型试验。试验结果表明,竖向加载情况下井壁接头的压缩变形率可达47%,三轴加载情况下井壁接头的压缩变形率可达48.8%,侧向加载情况下井壁接头承载力可达29.16MPa,可知该可缩性井壁接头具有良好的压缩特性和防水性能。 (3)采用数值模拟方法,对可缩性井壁接头的力学特性进行分析。通过将数值模拟得到的井壁接头竖向承载力与模型试验结果相比较,验证了数值模拟分析的可靠性。 (4)根据冻结井筒内层井壁的施工工序,提出了冻结井可缩性井壁接头的现场施工技术。冻结井可缩性井壁接头在许疃矿新主井和北风井中得到了成功应用,相应的设计和施工技术可为类似工程提供参考依据。冻结井可缩性井壁接头可广泛应用于类似地层条件下的煤矿新井建设与改扩建工程中,将产生更大的社会与经济效益。
[Abstract]:Since the 1980s, a large number of shaft wall fracture accidents have occurred in Anhui, Xuzhou, Jiangsu, Yongxia, Shandong, Yanzhou, Shandong and Dongrong, Heilongjiang, etc., and the causes of shaft wall fracture have been agreed at present. That is, the bottom aquifer through which the broken shaft wall passes through the topsoil layer is directly covered on the weathered bedrock section, and there is a lack of water insulation layer. Because the hydrophobic settlement of the bottom aquifer produces the vertical additional force (negative friction force) acting on the wellbore, the main cause of the shaft wall fracture is the hydrophobic settlement of the bottom aquifer. Both the new main well and the north wind well of the reconstruction and expansion project of Xutuan Coal Mine pass through this kind of hydrophobic subsidence formation, so the influence of vertical additional force should be considered in the design of shaft lining structure to prevent shaft wall fracture. In this paper, the retractable shaft lining joint of frozen well in Xutuan Coal Mine Reconstruction and extension Project is studied by means of theoretical analysis, model test and numerical simulation. The research contents and achievements are as follows: (1) according to the design principles and methods of the retractable shaft lining joint of the frozen well, one vertical retractable shaft lining joint is set up for the new main shaft and the north wind well of Xutuan Coal Mine. The structural parameters of the retractable shaft lining joint of the frozen well are obtained, which are located at the cumulative depth of 357m and 353m, respectively, and the structural parameters of the retractable shaft lining joint of the frozen well are obtained. (2) the vertical, lateral and triaxial loading model tests of the retractable shaft lining joint are carried out by using the model test method. The test results show that the compression deformation rate of shaft wall joint can reach 47% under vertical loading, 48.8% under triaxial loading, and 29.16 MPA under lateral loading. It can be seen that the retractable shaft lining joint has good compression and waterproof properties. (3) the mechanical properties of retractable shaft lining joint are analyzed by numerical simulation method. The reliability of the numerical simulation analysis is verified by comparing the vertical bearing capacity of the shaft lining joint with the results of the model test. (4) according to the construction procedure of the inner layer of the frozen wellbore, the field construction technology of the retractable shaft lining joint of the frozen well is put forward. The retractable shaft wall joint of frozen well has been successfully applied in the new main shaft and Beifeng well of Xutuan Mine, and the corresponding design and construction technology can provide a reference for similar projects. The retractable shaft wall joint of frozen wells can be widely used in the construction, reconstruction and expansion of new wells in coal mines under similar formation conditions, which will produce greater social and economic benefits.
【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】：TD265

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