STUDY ON MECHANICAL PROPERTIES OF MARBLE UNDER LOADING AND UNLOADING CONDITIONS
STUDY ON MECHANICAL PROPERTIES OF MARBLE UNDER LOADING AND UNLOADING CONDITIONS
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发表时间：
2005
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通讯作者：
Liu Jianfeng
中科院分区：
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作者：
Liu Jianfeng
试验表明，在加卸载条件下，岩体的力学性质存在一定的差异。对锦屏一级水电站边坡大理岩试样进行了一系列加卸载条件下的三轴试验，研究了大理岩的力学性能。然后计算和解释了力学参数，并研究和比较了应力-应变全曲线。试验结果表明，大理岩在加卸载条件下的力学性能有明显的差异。在卸荷条件下，变形模量和抗压强度下降，抗剪强度c下降幅度较大，但？增加一点点。在破坏过程中，卸载条件下的侧向应变比加载条件下的侧向应变增加得多，塑性下降，脆性增加。研究结果揭示了大理岩在加卸载条件下力学性能的具体差异，为工程问题提供了重要参考。
It is shown by tests that there are some differences between mechanical properties of rock masses under loading and unloading conditions. A series of tri-axial tests under loading and unloading conditions are done on the marble samples from the slopes of the Jinping Primary Hydropower Project to study the mechanical properties of marble. Then the mechanical parameters are calculated and interpreted,and the complete stress-strain curves are studied and compared. The results of these tests show that there are obvious differences between mechanical properties of marble under loading and unloading conditions. Under the unloading condition,the deformation modulus and the compressive strength decline,and for the shear strength,c declines a great deal,but ? increases a little. In the failure process,the lateral strain under unloading condition increases much more than that under loading condition with the same confining pressure,the plasticity declines and the brittleness increases. The results show the concrete difference of mechanical properties of marble under loading and unloading conditions and offer important references to engineering problem.