塔什店风井井壁保护冻结温度场与应力场研究

发布时间：2018-06-23 02:26

  本文选题：井壁保护 + 温度场　； 参考：《煤炭科学研究总院》2016年硕士论文

【摘要】：近年来,我国西部地区矿井建设全面展开,普通法施工西部矿井发生井筒淹水事故后多采用冻结法完成事故井施工；冻结法处理事故井过程中,面临着许多工程技术难题。论文以冻结法施工的塔什店矿区一号矿风井已成型井壁保护问题为主线,运用理论分析、数值模拟和现场实测相结合的方法,着力于冻土力学性能试验、温控条件下冻结温度场演化规律、冻结应力场分布情况、基于工程实测的数值反演等方面开展的研究。针对矿区井筒检查孔取芯试样进行了较全面的冻土物理力学试验,试验结果显示,低温下岩样单轴抗压强度低,均不足10MPa；蠕变试验揭示岩样为非稳定蠕变,温度、应力和时间是影响冻土蠕变的关键因素；无水源补给的条件下岩样均有冻胀性。采用ANSYS软件,根据冻土试验得到的热力学参数建立温控条件下冻结温度场模型并进行有限元分析,结果表明温控孔开启后冻结温度场等温线以冻结孔为中心呈同心圆发展趋势,在温控孔附近等温线呈内凹状；冻结主面特征曲线在温控孔处发生突变,影响冻结壁发展。采用间接耦合的方法进行热应力分析,得到冻结应力场分布云图,显示冻结壁内积聚冻胀力,温控孔作用范围内起到应力缓冲的效果。对比开启和未开启温控孔情况下冻结温度场与应力场特征参数,体现温控孔设置对工程的实践意义,为井壁保护提供参考。最后,基于现场实测数据进行数值反演得到地层仿真模型,利用模型推演出温控孔最佳开启时机70d和最佳开启温度10℃～15℃指导工程施工。工程实际施工效果良好,同时验证了模拟结果的可靠性和科学性。
[Abstract]:In recent years, the mine construction in the west of China has been carried out in an all-round way. The freezing method is often used to complete the construction of the accident wells after the shaft flooding accident occurs in the west of China, and the freezing method is faced with many technical problems in the process of dealing with the accident wells. The main line of the paper is the protection of the formed shaft wall of the No. 1 mine wind shaft in Tashhidian mining area, which is constructed by freezing method. By using the method of theoretical analysis, numerical simulation and field measurement, the paper focuses on the test of the mechanical properties of permafrost. The evolution law of freezing temperature field, the distribution of frozen stress field and the numerical inversion based on engineering measurements are studied in this paper. A comprehensive physical and mechanical test of permafrost was carried out for the core sample of wellbore inspection in mining area. The test results show that the uniaxial compressive strength of rock sample is low at low temperature, which is less than 10 MPA, and the creep test reveals that the rock sample is unstable creep and temperature, Stress and time are the key factors affecting the creep of frozen soil. Using ANSYS software, according to the thermodynamic parameters obtained from the frozen soil test, the model of freezing temperature field under the condition of temperature control is established and the finite element analysis is carried out. The results show that the isotherm of freezing temperature field takes the freezing hole as the center of the development trend of concentric circle after the opening of the temperature control hole. The isotherm is concave near the temperature-controlled hole, and the characteristic curve of the freezing main surface changes at the temperature controlled hole, which affects the development of the freezing wall. An indirect coupling method is used to analyze the thermal stress, and the distribution of the frozen stress field is obtained, which shows that the freezing heaving force is accumulated in the frozen wall and the effect of stress buffering is obtained in the range of temperature controlled holes. By comparing the characteristic parameters of freezing temperature field and stress field between open and unopened temperature controlled holes, the practical significance of temperature control hole setting for engineering is reflected, and the reference for wellbore protection is provided. Finally, the formation simulation model is obtained by numerical inversion based on the field measured data, and the optimum opening time of temperature control hole is 70 days and the optimum opening temperature is 10 鈩，

本文编号：2055334