深埋条件下TBM解困水平与竖直双向冻结温度场发展规律研究

发布时间：2018-04-20 23:01

本文选题：TBM解困 + 冻结法　；参考：《中国矿业大学》2014年硕士论文

【摘要】：本文以甘肃省引洮供水一期工程TBM解困工程为背景，采用数值模拟、物理试验、现场实测相结合的方法，对形成的竖直、水平双向冻结温度场发展变化规律进行研究。首先，根据物理模拟试验的结果，合理调整土体热物理参数，进行双向冻结温度场发展变化规律的数值模拟研究。并且，对实际工况下的冻结温度场发展变化情况、控制截面的交圈情况进行了预测，确定了双向冻结模型的薄弱位置；研究了水平竖直冻结管间距、提前冻结时间两个因素对薄弱交界面冻结壁厚度的影响规律；发现了冻结温度场趋于稳定后平均温度与冻结管外壁温度的比值k、冻结壁厚度E的特性。其次，根据初步数值模拟结果，合理设计物理模拟试验系统。通过物理模拟试验，研究了温度场发展变化规律。得到的结论与数值模拟实验结果一致。另外，通过现场实测对冻结温度场进行研究，得到了温度变化曲线，分析了实际工况下温度场发展变化规律。最后，对数值模拟与物理模拟实验、数值模拟与现场实测的测温孔温度、特征面温度分布分别进行了对比，分析了由于数值模拟模型假定参数选取上存在的偏差，并对物理模拟试验提出了改进优化的思路。通过3种研究手段所得结果的相互验证，得到了水平与竖直双向冻结温度场发展变化规律，预测了工程中冻结壁交圈的时间。所得结论具有科学性、准确性，，对类似工程具有指导意义。
[Abstract]:Based on the TBM project of water diversion and water supply in Gansu Province, this paper studies the development and variation of vertical, horizontal and bidirectional freezing temperature field by means of numerical simulation, physical test and field measurement. Firstly, according to the results of physical simulation test, the thermal physical parameters of soil are adjusted reasonably, and the numerical simulation study on the development and variation of bidirectional freezing temperature field is carried out. Furthermore, the development and variation of freezing temperature field under actual working conditions and the intersection of control section are predicted, the weak position of the bi-directional freezing model is determined, and the horizontal vertical freezing tube spacing is studied. The influence of two factors of early freezing time on the thickness of the freezing wall at the weak interface is studied, and the characteristics of the freezing wall thickness E and the ratio of the average temperature to the outside wall temperature of the freezing tube after the freezing temperature field becomes stable are found. Secondly, according to the preliminary numerical simulation results, the physical simulation test system is designed reasonably. The development and variation of temperature field are studied by physical simulation test. The results are in agreement with the numerical simulation results. In addition, the freezing temperature field is studied by field measurement, and the curve of temperature change is obtained, and the law of development of temperature field under actual working condition is analyzed. Finally, the numerical simulation and physical simulation experiments, numerical simulation and field measurement of the temperature of the hole temperature, characteristic surface temperature distribution were compared, the analysis of the numerical simulation model on the basis of the selection of the parameters of the bias. The idea of improving optimization for physical simulation test is also put forward. Through the mutual verification of the results obtained from three kinds of research methods, the development and variation law of horizontal and vertical bidirectional freezing temperature field is obtained, and the time of freezing wall intersection in engineering is forecasted. The conclusions are scientific and accurate, and have guiding significance for similar projects.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV554

【参考文献】