Coupled thermo-hydro-mechanical analysis of a heater test in fractured rock and bentonite at Kamaishi Mine : comparison of field results to predictions of four finite element codes
Coupled thermo-hydro-mechanical analysis of a heater test in fractured rock and bentonite at Kamaishi Mine : comparison of field results to predictions of four finite element codes
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DOI：
10.1016/s1365-1609(00)00069-1
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发表时间：
2001
影响因子：
7.2
通讯作者：
J. Rutqvist;L. Börgesson;M. Chijimatsu;T. S. Nguyen;L. Jing;J. Noorishad;C. Tsang
中科院分区：
文献类型：
--
作者：
J. Rutqvist;L. Börgesson;M. Chijimatsu;T. S. Nguyen;L. Jing;J. Noorishad;C. Tsang
四个计算机代码应用于预测耦合的热-水-力学响应在原位加热器实验模拟核废料沉积孔与废物过包装和膨润土缓冲，周围的破碎岩石。加热器周围环境中的升高的温度（其在100°C下保持8.5个月）在粘土缓冲层中产生大量热驱动的水分流动和膨胀，以及周围断裂岩石的热膨胀。预测的系统响应-包括温度，水分含量，流体压力，应力和位移-进行了比较，在70个传感器位于粘土缓冲区和近场岩石的测量。整体良好的建模和测量结果之间的协议表明，大多数热-水-力学响应是相当好的代表耦合的数值模型。对低饱和度下膨胀粘土缓冲层的流体力学行为模拟、低应力裂隙岩石近场非均质力学行为模拟以及岩石-缓冲层界面模拟等问题进行了研究。
Four computer codes were applied for a prediction of coupled thermo-hydro-mechanical responses during an in situ heater experiment which simulates a nuclear waste deposition hole with a waste over-pack and bentonite buffer, surrounded by fractured rock. The elevated temperature in the heater surroundings, which was maintained at 100°C for 8.5 months, generated substantial heat-driven moisture flow and swelling in the clay buffer, and thermal expansion of the surrounding fractured rock. Predicted system responses — including temperature, moisture content, fluid pressure, stress and displacement — were compared to measurements at 70 sensors located both in the clay buffer and the near-field rock. An overall good agreement between modeling and measured results indicates that most thermo-hydro-mechanical responses are fairly well represented by the coupled numerical models. Uncertainties occur for modeling of hydromechanical behavior of the swelling clay buffer at low saturation, modeling of near-field heterogeneous mechanical behavior of the low-stressed fractured rock, and modeling of the rock–buffer interface.