Damage effects and model for jointed rock mass under water-rock interaction and repeated shear sequence
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摘要: 水库蓄水运行过程中，部分库岸边坡出现了明显的台阶式变形趋势，消落带岩体处于库水位周期性升降变化和阶段性重复剪切次序作用下。基于此，设计进行了节理岩体的水-岩作用试验，并在不同水-岩作用周期进行重复剪切试验，研究结果显示：①在水-岩和重复剪切次序作用下，节理岩体的抗剪强度、剪切刚度、节理面粗糙度系数均呈现先陡后缓的劣化趋势，比较而言，前4个作用周期的劣化趋势尤为明显，而且法向应力越大，劣化趋势越明显；②由重复剪切导致的抗剪强度劣化趋势在初始状态时尤为明显，之后随水-岩作用周期的增加迅速减弱，由水-岩作用导致的抗剪强度劣化趋势在前4个作用周期较为明显，随后趋于平缓；③将节理面岩壁损伤区域分为水-岩作用损伤区域、水-岩和重复剪切次序作用损伤区域，对JRC-JCS抗剪强度模型进行了修正，验证分析表明修正后的模型计算值与试验结果吻合较好。相关研究方法和成果可为库岸边坡消落带节理岩体性能劣化分析提供较好参考。Abstract: In the process of reservoir impoundment, some bank slopes show an obvious step-type deformation trend, and the rock mass in the water-level-fluctuation zone is under the action of periodical fluctuation of reservoir water level and periodic repeated shear sequence. Based on this, the water-rock interaction tests on the jointed rock mass are designed, and the repeated shear tests are carried out in different water-rock interaction periods. The results show that: (1) Under the effects of water-rock and repeated shear sequence interaction, the shear mechanical properties of jointed rock mass deteriorate obviously, while the shear strength, shear stiffness and JRC exhibit the degradation trend of "first steep then slow". In comparison, the former six cycles of degradation trend are obvious, and the greater the normal stress, the more obvious the degradation trend. (2) The deterioration trend of the shear strength caused by the repeated shear is particularly obvious in the initial state, and then decreases rapidly with the increase of the water-rock interaction cycle. The deterioration trend of the shear strength caused by the water-rock interaction is obvious in the first six cycles, and then tends to be flat. (3) The damage area of joint surface wall is divided into the water-rock damage area, water-rock and repeated shear sequence damage area. The JRC-JCS shear strength model is modified, and the verification analysis shows that the calculated values by the modified model are in good agreement with the test results. The relevant research methods and results may provide a good reference for the performance degradation analysis of jointed rock mass in the water-level-fluctuation zone of reservoir bank slopes.
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Keywords:
- hydro-fluctuation belt /
- water-rock interaction /
- repeated shear /
- sequence interaction /
- damage
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图 1 典型库岸边坡随时间的累积位移变化[17]
Figure 1. Cumulative displacements of typical reservoir bank slope with time
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图 3 典型节理试样剪切应力-剪切位移曲线
Figure 3. Shear stress-shear displacement curves of typical samples
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图 4 水-岩和重复剪切次序作用下的剪切应力-剪切位移曲线
Figure 4. Shear displacement-shear stress curves under water-rock interaction and repeated shear sequence
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图 5 水-岩和重复剪切次序作用下节理岩体抗剪强度劣化图
Figure 5. Shear strength deterioration of jointed rock mass under water-rock and repeated shear sequence
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图 6 重复剪切和水-岩作用分别导致的节理岩体抗剪强度阶段劣化柱状图
Figure 6. Columnar diagram of shear strength deterioration of jointed rock mass caused by repeated shear and water-rock interaction
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图 7 节理面归一化的粗糙度系数劣化规律曲线
Figure 7. Curves of normalized JRC degradation law of joint surface
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图 8 节理面岩壁强度和基本内摩擦角劣化曲线
Figure 8. Deterioration curves of JCS and basic internal friction angle
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图 9 节理面抗剪强度试验值与计算值对比图
Figure 9. Comparison between test and calculated values of shear strength of joint surface
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图 10 水-岩和重复剪切次序作用下结构面岩壁损伤区域
Figure 10. Damage area of structural plane under water-rock interaction and repeated shear sequence
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