Analysis Of Large Block Test Data Using Three-Dimensional Discontinuous Deformation Analysis
Analysis Of Large Block Test Data Using Three-Dimensional Discontinuous Deformation Analysis
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DOI：
10.1016/j.ijrmms.2004.03.093
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发表时间：
2004-05
影响因子：
7.2
通讯作者：
M. R. Yeung;N. Sun;Q. Jiang;S. Blair
中科院分区：
文献类型：
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作者：
M. R. Yeung;N. Sun;Q. Jiang;S. Blair
大块试验(LBT)是对裸露的裂隙岩石块进行的现场热试验。由于该区块是一个映射良好的裂隙岩体，因此它是使用不连续变形分析(DDA)等不连续介质模型进行分析的很好的候选对象。本文介绍了LBT的三维(3D)DDA正演分析结果。将区块内各点测得的温度历史作为3D DDA正演分析的输入，计算了WM-1和NM-3两台多点钻孔伸缩仪的锚点变形。总的来说，计算的MPBX锚点随时间变化的曲线图的形状与实测值大致相符。然而，由于3D DDA分析中使用的完整岩石的热膨胀系数实际上是实测值的100倍，如果使用实际测量的热膨胀系数，则计算的锚点变形量实际上应该小于实测值。
The Large Block Test (LBT) is an in situ thermal test on an exposed block of fractured rock. Because the block is a well mapped fractured rock mass, it is a good candidate for analysis using discontinuum models such as the Discontinuous Deformation Analysis (DDA). This paper presents results of a three-dimensional (3D) DDA forward analysis of the LBT. The temperature histories measured at various points in the block are used as input into the 3D DDA forward analysis to compute the anchor point deformations of 2 multiple point borehole extensometers (MPBXs), WM-1 and NM-3. In general, the shapes of the plots of the computed MPBX anchor point deformations against time roughly match those of the measured ones. However, because the thermal expansion coefficient of the intact rock used in the 3D DDA analysis is actually 100 times the measured one, the magnitudes of the computed anchor point deformations should actually be smaller than the measured ones, if the actual measured thermal expansion coefficient was used.