库水作用下滑坡土体渗流与蠕变耦合试验研究

王力; 孙文铎; 王世梅; 胡秋芬; 陈玙珊; 南芳芸

doi:10.11988/ckyyb.20221071

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长江科学院院报 ›› 2024, Vol. 41 ›› Issue (2) : 128-134. DOI: 10.11988/ckyyb.20221071

岩土工程

库水作用下滑坡土体渗流与蠕变耦合试验研究

王力^1,2,3,4, 孙文铎^1,2, 王世梅^1,2, 胡秋芬^1,2, 陈玙珊^1,2, 南芳芸^1,2

作者信息 +

Seepage and Creep Coupling of Landslide Soil under Reservoir Water Action

WANG Li^1,2,3,4, SUN Wen-duo^1,2, WANG Shi-mei^1,2, HU Qiu-fen^1,2, CHEN Yu-shan^1,2, NAN Fang-yun^1,2

Author information +

文章历史 +

摘要

水库滑坡变形具有显著的渗流与蠕变耦合效应。为此,采用自主研发的渗流与蠕变耦合三轴试验仪,分别开展了渗流对蠕变的影响以及变形对渗流的影响试验研究,并改进GDS三轴仪完成了高精度控制和量测的渗流与蠕变耦合试验。结果表明:渗流作用下,土样体积变形随时间先逐渐增大后缓慢减小,主要原因是超孔隙水压力导致围压卸荷,使得土样产生回弹变形,但渗透压力持续作用于土体,使得土样体积持续缓慢减小;获取了渗流过程中土样体积的变化结果,分别建立了渗流开始前试样e-k(孔隙比-渗透系数)关系曲线及渗流稳定后试样e-k关系曲线,结果表明考虑变形影响的e-k关系曲线更能反映土体的流固耦合效应。研究成果可望为水库滑坡变形演化预测提供更加科学严密的理论和方法。

Abstract

The deformation of reservoir landslides exhibits a significant coupling effect between seepage and creep. In this study, we investigated the influence of seepage on creep and the impact of deformation on seepage using a self-developed seepage and creep coupling triaxial apparatus. By redesigning and improving the GDS triaxial apparatus, we conducted seepage and creep coupling tests with precise control and measurement. Our findings reveal that under the influence of seepage, the volume deformation of soil samples gradually increases with time and then slowly decreases. This behavior is attributed to excess pore water pressure leading to the unloading of confining pressure, resulting in rebound deformation of the soil sample. Despite this, the ongoing effects of seepage pressure continue to act on the soil, contributing to a gradual decrease in sample volume. Furthermore, we obtained the data of volume changes of soil samples during the seepage process and established the void ratio-permeability coefficient (e-k) relationship curve before seepage and after achieving seepage stability. The results demonstrate that considering the influence of deformation yields a more accurate e-k relationship curve, better reflecting the fluid-solid coupling effect of the soil. These research findings are expected to contribute to the development of a more scientific and rigorous theory and method for predicting the evolution of deformation in reservoir landslides.

导出引用

王力, 孙文铎, 王世梅, 胡秋芬, 陈玙珊, 南芳芸. 库水作用下滑坡土体渗流与蠕变耦合试验研究[J]. 长江科学院院报. 2024, 41(2): 128-134 https://doi.org/10.11988/ckyyb.20221071

WANG Li, SUN Wen-duo, WANG Shi-mei, HU Qiu-fen, CHEN Yu-shan, NAN Fang-yun. Seepage and Creep Coupling of Landslide Soil under Reservoir Water Action[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(2): 128-134 https://doi.org/10.11988/ckyyb.20221071

中图分类号： TU41

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