Continuous approach for coupled mechanical and hydraulic behavior of a fractured rock mass during hypothetical shaft sinking at Sellafield, UK
Continuous approach for coupled mechanical and hydraulic behavior of a fractured rock mass during hypothetical shaft sinking at Sellafield, UK
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DOI：
10.1016/s1365-1609(00)00063-0
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发表时间：
2001
影响因子：
7.2
通讯作者：
A. Kobayashi;T. Fujita;M. Chijimatsu
中科院分区：
文献类型：
--
作者：
A. Kobayashi;T. Fujita;M. Chijimatsu
一个指标模拟技术被用来推断连续的水力传导系数分布在BVG的任务1A的DECOVALEX II。来自电缆地球物理测量的杨氏模量被用作软数据。为了用任务1B中的测量数据校准模型，应用贝叶斯估计的反分析来确定有限元网格的所有单元的水力传导率。为了避免不适定问题，一个地质统计克里格水力传导率分布被用作平均先验信息。虽然还存在一些问题，但与常规分析相比，该解决方案有所改进。对于任务1C中的凿井问题，采用连续方法，将裂隙张量理论与岩石节理的巴顿和班迪斯模型相结合，对力学和水力学行为进行耦合分析。在模拟竖井开挖过程中，得到了各向异性和非均匀性的力学和水力特性。结果发现，计算的导水率变得大于测量的结果开挖。
An indicator simulation technique was used to infer the continuous hydraulic conductivity distribution in the BVG for Task 1A of DECOVALEX II. Young's modulus from the wireline geophysical survey was used as soft data. To calibrate the model with measured data in Task 1B, a back analysis with Bayesian estimate was applied to determine the hydraulic conductivity of all the elements of the finite element mesh. To avoid the ill-posed problem, a geostatistically kriged hydraulic conductivity distribution was used as mean a priori information. While there are some remaining problems, the solution was improved in comparison with the ordinary analysis. For the shaft sinking problem defined as Task 1C, the continuous approach to coupled mechanical and hydraulic behavior was used by combining crack tensor theory and the Barton and Bandis model for rock joints. The mechanical and hydraulic properties were derived with resultant anisotropy and heterogeneity during the simulated shaft excavation. It is found that the calculated hydraulic conductivity becomes larger than measured one as a consequence of excavation.