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首页> 外文会议>International UDEC/3DEC Symposium on Numerical Modeling of Discrete Materials in Geotechnical Engineering, Civil Engineering, and Earth Sciences; 20040929-1001; Bochum(DE) >UDEC modeling of constant normal stiffness direct shear tests
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UDEC modeling of constant normal stiffness direct shear tests

机译：恒定法向刚度直接剪切试验的UDEC建模

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摘要

Direct shear tests have not been widely used to test rock masses, yet they may be a better representation of the conditions a rock mass is subjected to in the field and may also provide data on the behavior of rock masses under load that may not be obtained using other methods. However, the process of fabricating shear testing equipment and rock mass samples is both expensive and difficult. It may be more expedient to model direct shear tests using numerical techniques. The model would need to be developed and verified against experimental data. However, once this is done, it could be used to investigate failure mechanisms and to carry out parametric studies on rock masses at relatively minimal expense and time. Laboratory direct shear tests have been carried out under constant normal stiffness (CNS) conditions on relatively large-scale, jointed, soft rock masses at Monash University. The behavior of the samples during the tests, both physically and visually, has been recorded. Three typical pre-peak and failure mechanisms were observed during testing. The direct shear tests have been modeled using the two-dimensional distinct element code, UDEC, to investigate if the numerical model can replicate these same mechanisms. FISH routines have been incorporated into the UDEC model to measure stresses and deformations and to apply CNS conditions. A movie of rock mass behavior during the test has also been generated. This paper describes the UDEC model and compares the behavior of the laboratory rock mass samples with the UDEC simulations.
机译：直接剪切测试尚未广泛用于测试岩体，但是它们可以更好地表示岩体在野外所处的条件，并且还可以提供关于岩体在载荷作用下可能无法获得的数据。使用其他方法。然而，制造剪切测试设备和岩体样品的过程既昂贵又困难。使用数值技术对直接剪切试验进行建模可能更为方便。该模型将需要开发并针对实验数据进行验证。但是，一旦完成，它可以用于研究破坏机理，并以相对最小的花费和时间对岩体进行参数研究。莫纳什大学在相对较大的节理软岩体上在恒定法向刚度（CNS）条件下进行了实验室直接剪切试验。记录了测试过程中样品的物理和视觉行为。在测试过程中观察到三种典型的峰前和故障机制。已经使用二维不同元素代码UDEC对直接剪切测试进行了建模，以研究数值模型是否可以复制这些相同的机制。 FISH例程已合并到UDEC模型中，以测量应力和变形并应用CNS条件。还生成了测试过程中的岩体行为电影。本文介绍了UDEC模型，并将实验室岩体样品的行为与UDEC模拟进行了比较。

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