【作者】 孙健；

【导师】 李涛；

【作者基本信息】 北京交通大学 ， 岩土工程， 2012， 硕士

【摘要】 本文在总结国内外现有研究成果的基础上,依托国家国防科工局高放废物地质处置项目,针对高放废物地下处置库近场裂隙岩体中的热—水—力三场(THM)耦合问题,通过采用室内米级尺度模型试验和数值模拟方法进行研究,主要工作和取得的研究成果如下：(1)以我国首个高放废物拟建地下处置库工程为背景,在理论分析和项目组已有研究成果的基础上,制定了室内米级尺度的裂隙岩体热—水—力三场耦合模型实验方案,并制作了一套能够模拟裂隙岩体三场耦合作用的实验装置,具体包括实验方案制定,测试元器件选择,试验模型设计、制作和调试等。该实验装置包含采集于甘肃北山的32块200×250×300mm的花岗岩试块构成的裂隙岩体模型。试验的边界条件为左侧边界加热、右侧边界受力、垂直向渗流以及四周隔热。(2)利用实验装置进行室内米级尺度裂隙岩体热—水—力三场耦合的模型试验。第一步先进行渗流场的单场试验,第二步进行热—水两场耦合试验,最后第三步进行热—水—力三场耦合试验。试验分析了其中温度场、渗流场和应力场的变化规律以及他们之间的相互影响作用,重点研究裂隙岩体受力对渗流场和温度场的影响。(3)根据室内试验的结果,采用与模型试验相应的初始边界条件,利用有限差分数值分析软件FLAC对模型试验进行数值模拟,研究在数值模拟中裂隙岩体三场耦合效应的体现,观察裂隙岩体受力对其他两场的影响在数值模拟中的表现。(4)将结果与模型试验的结果进行对比。对比结果表明两者较为吻合,但也存在一定的差异性,具体表现在力对热—水耦合的影响上,模型试验表现不如数值模拟明显。在此基础上研究近场裂隙岩体特征对高放废物深地质处置的影响。更多还原

【Abstract】 This paper based on the background of the research status for the deep geological disposal project of high level radioactive waste (HLW), research its thermal-hydrological-mechanical (THM) multi-field coupling by indoor meter scale model test and numerical simulation. The major contents and research achievements are as follow:(1) In the background of the China’s first proposed high-level radioactive waste underground repository project, under the guidance of the theory and existing research, develop thermal-hydrological-mechanical multi-field coupling model test program and the corresponding test preparatory work, Including program development、test components、test modeling and debugging. Use32granite test block that collected in Gansu South Mountain to constitute a model of the fractured rock mass. Conduct thermal-hydrological-mechanical (THM) multi-field coupling model test under the conditions of heat on the right side, force on the left side, vertical seepage and surrounding insulation(2) Use the experimental device to test thermal-hydrological-mechanical coupling in fractured rocks. First step, conduct a single field tests of the hydrological field. Second, conduct thermal-hydrological field coupling model test. Last, conduct the thermal-hydrological-mechanical (THM) multi-field coupling model test. An analysis of the variation of three fields and their mutual influence, focus on the impact that mechanic field on thermal and hydrological field.(3) According to the results of model test, use finite difference numerical analysis software FLAC to simulate the model test. On this basis, study three coupling effect of fractured rock mass in numerical simulation. Observe the impact that mechanic field on thermal and hydrological field in numerical simulation.(4) Compare the results of numerical simulation and model test, shows that they coincide a lot, but also have some differences, specifically manifested in the impact that mechanic field on thermal and hydrological field. This phenomenon is more obvious in numerical simulation than in the model test. On this basis, study the near-field fractured rock mass characteristics of high level radioactive waste deep geological storage.更多还原