深立井冻结管偏斜对温度场及冻结压力的影响研究

发布时间：2019-01-16 04:40

【摘要】：在煤矿深立井冻结法施工中,冻结管偏斜的现象较为普遍,冻结管偏斜对冻结壁的形成过程会造成一定影响,同时会影响立井井壁冻结压力的分布。为此,本论文以朱集矿风井井筒冻结法施工为工程背景,取该井筒的320m层位,依据该层位的冻结管偏斜实测数据,对比冻结管实际偏斜和无偏斜两种情况,采用有限元程序ABAQUS,对该层位冻结壁温度场和冻结压力的分布规律进行了研究。主要得到以下结论:(1)冻结管偏斜在很大程度上会延长冻结壁的交圈时间;冻结管偏斜对井帮温度和冻结壁厚度具有很大的影响,在不考虑冻结管偏斜情况下,井帮温度和冻结壁厚度呈现出均匀分布,在考虑冻结管偏斜情况下,井帮温度和冻结壁厚度呈现出明显的不均匀分布;(2)冻结管偏斜在很大程度上影响着井壁的冻结压力分布,在不考虑冻结管偏斜的情况下,井壁冻结压力为1.106MPa;在考虑冻结管偏斜的情况下,井壁冻结压力为 1.085～1.851MPa。(3)通过井壁冻结压力的数值模拟和现场实测结果对比分析,表明冻结管偏斜对冻结压力的非均匀分布具有一定的影响。冻结压力实测值与数值模拟值具有一定差异,是因为影响冻结压力的因素很多,比如深度、土体性质、土体含水量、施工工艺、井筒开挖荒径的不均匀性等,因此,在冻结法凿井施工中,应严格控制冻结管的偏斜。
[Abstract]:In the freezing construction of deep shaft in coal mine, the deflection of freezing pipe is common, and the deflection of freezing pipe will affect the formation process of freezing wall and the distribution of freezing pressure of shaft wall. Therefore, this paper takes the construction of the shaft freezing method in Zhuji mine as the engineering background, taking the 320m horizon of the shaft, according to the measured data of the freezing tube deflection, contrasting the actual deflection of the freezing tube with the non-deflection of the freezing pipe, and adopting the finite element program ABAQUS,. The distribution of the temperature field and the freezing pressure of the layer freezing wall are studied. The main conclusions are as follows: (1) the deflection of freezing tube will prolong the time of intersection of freezing wall to a great extent; The deflection of freezing tube has a great influence on well wall temperature and freezing wall thickness. Without considering the deflection of freezing tube, the well wall temperature and frozen wall thickness show a uniform distribution, and when considering the deflection of frozen tube, the well wall temperature and freezing wall thickness are uniformly distributed. Well wall temperature and freezing wall thickness show obvious uneven distribution; (2) the freezing pressure distribution of the well wall is greatly affected by the freezing tube deflection. The freezing pressure of the shaft wall is 1.106 MPA without considering the freezing tube deflection; Considering the deflection of freezing pipe, the freezing pressure of wellbore is 1.08551.851MPa. (3) through the numerical simulation of the freezing pressure of shaft wall and the comparison and analysis of the field measured results, The results show that the deflection of freezing tube has a certain influence on the non-uniform distribution of freezing pressure. The difference between the measured value of freezing pressure and the numerical simulation value is due to the fact that there are many factors affecting freezing pressure, such as depth, nature of soil, water content of soil, construction technology, non-uniformity of shaft excavation diameter, etc. The deflection of freezing pipe should be strictly controlled in the shaft sinking by freezing method.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD265.3

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