不同含石率土石混合体水力侵蚀分异特征及机制

doi:10.13722/j.cnki.jrme.2023.0246

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摘要水力作用诱发的堆积体滑坡是我国西南地区主要地质灾害之一，研究土石混合体的侵蚀分异机制对深入揭示此类滑坡机制具有重要意义。含石率是影响土石混合体侵蚀分异特征最主要的因素之一。基于不同含石率的土石混合体渗透侵蚀试验，揭示了不同含石率土石混合体的侵蚀分异特征及机制。结果表明：土石混合体的渗透侵蚀过程中，随机存在侵蚀加剧、侵蚀减缓、内部块石结构重组、侵蚀稳定4种状态，含石率对其侵蚀分异特征有显著影响；渗透系数随含石率的增加先增大后减小再增大，60%含石率的土石混合体渗透性最小，其渗透系数均小于1×10−2 cm/s，且波动幅度不大，高含石率土石混合体渗透前、后渗透系数变化率基本小于10%；侵蚀量随水力梯度增加而增加，基于侵蚀量变化，将渗透侵蚀分为3个阶段：剧烈侵蚀阶段、缓慢侵蚀阶段、稳定渗流阶段，临界水力梯度随含石量增加而降低；含石率通过影响土石结构填充形式影响土石混合体的渗透性，满填结构抗渗性能最好，这为揭示堆积体边坡的水力失稳机制提供了思路和参考。

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	杨忠平1
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	李勇华1
	李诗琪1
	刘浩宇1
	高宇豪1

关键词 ：土工试验, 土石混合体, 含石率, 侵蚀分异, 土石结构, 水力侵蚀

Abstract：Hydrodynamically induced colluvial landslide is one of the main geological disasters in southwest China. It is significant to investigate the erosion differentiation mechanism of soil-rock mixtures for revealing the landslide mechanism in depth. The rock content is the most important factor affecting the erosion differentiation characteristics of soil-rock mixtures. Based on the seepage erosion tests of soil-rock mixtures with different rock content，the erosion differentiation characteristics and mechanism of soil-rock mixtures are revealed. The results show that there are four random states in the process of seepage erosion of soil-rock mixtures：erosion intensification，erosion mitigation，internal block structure reorganization and erosion stability. The rock content has a significant effect on the erosion differentiation characteristics. The permeability coefficient of soil-rock mixture increases at first，then decreases subsequently，and then increases again with the increasing rock content，and the lowest value is observed at the rock content of 60%，which was less than 1×10－2 cm/s and cause a slight fluctuation. Whereas，the permeability coefficient of soil-stone mixtures at a high rock content is nearly unchanged before and after seepage，with a change rate less than 10%. The amount of erosion increases with the increasing hydraulic gradient. On the basis of change of erosion amount，the seepage erosion is divided into three stages：violent erosion，slow erosion and stable seepage stage. The critical hydraulic gradient decreases with increasing rock content. The rock content affects the permeability of the soil-rock mixtures by affecting the filling form of the soil-rock structure，and the full-filled structure has the best impermeability，which provides ideas and references for revealing the mechanism of hydraulic instability of the colluvial slope.

Key words： geotechnical test soil-rock mixtures rock content erosion differentiation soil-rock structure hydraulic erosion

引用本文:

杨忠平1，2，3，李勇华1，李诗琪1，刘浩宇1，高宇豪1. 不同含石率土石混合体水力侵蚀分异特征及机制[J]. 岩石力学与工程学报, 2024, 43(1): 133-145.
YANG Zhongping1，2，3，LI Yonghua1，LI Shiqi1，LIU Haoyu1，GAO Yuhao1. Differentiation characteristics and mechanism of hydraulic erosion of soil-rock mixtures with different rock contents. , 2024, 43(1): 133-145.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0246 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I1/133

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