EXPERIMENTAL RESEARCH ON STABILITY OF JINPING HIGH SLOPE WITH THREE-DIMENSIONAL GEOMECHANICAL MODEL
EXPERIMENTAL RESEARCH ON STABILITY OF JINPING HIGH SLOPE WITH THREE-DIMENSIONAL GEOMECHANICAL MODEL
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发表时间：
2008
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通讯作者：
Z. Zhong
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作者：
Z. Zhong
在关于边坡稳定性的讨论中，经常出现的一个问题是水力工程的岩质边坡能开挖多高多陡。提出了一种新的边坡破坏试验方法；其中，边坡模型在液压举升作用下由稳定状态旋转到破坏状态。在本试验中，随着模型旋转角度的增大，自重和总致滑力会发生变化；通过DV监测仪可以观察到裂纹的萌生、扩展、岩体滑移和最终破坏过程。最后，利用位移数据传感器也可以对边坡稳定的安全系数进行评价。试验结果表明：(1)边坡无加固区弯曲、倾倒裂缝和强松弛、张拉裂缝普遍扩展；f5、f8、f42-9、SL44-1和煌斑岩x断层存在岩石开裂和边坡破坏的控制因素。(2)边坡开裂的安全系数K1 = 1.92；整体稳定安全系数K2 = 3.26。(3)锚杆和长锚杆加固设计对于封堵岩体裂缝和边坡稳定是非常有效的。
A question which frequently arises in discussions on slope stability is how high and how steep can a rock slope be excavated for hydraulic engineering.A new slope failure test method is proposed;in which the slope model is rotated by hydraulic lift from stable state to failure.In this test,with increasing the rotation angle of model,the dead-weight and the total force tending to induce sliding would be changed;and the crack initiation,propagation,the rock mass slippage and final failure process can be observed by DV monitor.Finally,the factors of safety of slope stability also can be evaluated with displacement data sensors.The experimental results show that:(1) The bending and toppling cracks in the zone of the slope without reinforcement as well as strong relaxation and tensional cracks are extended commonly.The controlling factors for rock cracking and slope failure could be observed for the faults f5,f8,f42–9,SL44–1 and lamprophyre X.(2) The factor of safety of slope cracking,K1 equals 1.92;and the factor of safety of integrity stability,K2 equals 3.26.(3) The reinforcement design with bolts and long anchors are very effective for keeping cracks closed in rock and the slope stability.(4) The experimental method proposed is effective to evaluate the factor of safety of slopes similar to Jinping high slope.