Strength degradation of soft interlayer under dry-wet cycles based on 3D printing technology
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摘要:
软弱夹层是一类较为特殊敏感的地质体，其存在对水电工程边坡的稳定性起控制性作用。为了深入探讨库岸边坡中软弱夹层在干湿循环条件下的剪切力学特性及破坏机制，以菜籽坝抽水蓄能电站下水库坝址左岸坝肩边坡为研究对象，利用3D打印技术制备具有真实岩石形貌特征的结构面，并计算出结构面的粗糙度系数JRC，然后开展干湿循环作用下含人工节理面的软弱夹层剪切试验。研究结果表明，经过不同次数干湿循环，抗剪强度随循环次数增加呈负指数型降低，最终会趋于一个极低的稳定值，为初始强度的5%，且抗剪强度与结构面粗糙度呈正相关。软弱夹层的剪切应力-应变曲线在破坏阶段会呈阶梯式降低，结构面粗糙度越大，残余曲线阶梯式降低次数越多，且结构面粗糙度大的试样会在更短的剪切位移到达残余强度阶段，残余强度也随干湿循环次数的增加而降低。研究成果对抽水蓄能电站岸坡的稳定性评价具有较大的参考意义。
Abstract:Soft interlayers are critical geological formations that significantly impact the stability of slopes in water and hydropower engineering projects. This study investigated the shear mechanical characteristics and failure mechanism of the soft interlayer under dry-wet cycle conditions with a focus on the left bank shoulder slope of the Caizi Dam pumped storage power station’s lower reservoir. Real rock morphology characteristics were replicated using 3D printing technology to create structural surfaces, and the roughness coefficient JRC of different structural surfaces was then calculated. Subsequently, shear tests were conducted on soft interlayers containing artificial joint surfaces subjected to dry-wet cycles. The results indicate that, after multiple dry-wet cycles, the shear strength decreases exponentially as the number of cycles increases, and eventually approaches a very low stable value, which is approximately 5% of the initial strength. Moreover, the shear strength is positively correlated with the roughness of the structural plane. The shear stress-strain curve of the soft interlayer exhibits a stepwise decrease during the failure stage, with the magnitude of this decrease in the residual curve proportional to structural surface roughness. Samples with higher roughness on the structural surface reach the residual strength stage at a shorter shear displacement, and the residual strength decreases as the number of dry-wet cycles increases. This study provides valuable insights for slope stability assessments in energy dissipation and water storage projects.
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Key words:
- soft interlayer /
- dry-wet cycle /
- 3D printing /
- strength deterioration /
- roughness /
- residual strength
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表 1 试验用软弱夹层物理参数
Table 1. Physical parameters of soft interlayer for testing
参数 天然密度
/（g·cm−3）剪切模量
/GPa黏聚力
/MPa内摩擦角
/（°）抗拉强度
/MPa取值 1.8 1.81 0.4 19 0.4 
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表 2 式（1）所需数据统计表
Table 2. Statistical values in the formula (1)
结构面 公式所需数据 x1 x2 x3 x4 JRC 1号 1.362 0.620 2.439 3.836 7.748 2号 1.728 0.409 1.769 2.327 5.904 3号 1.499 0.054 0.148 0.383 4.200
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