库水作用下滑坡土体渗流与蠕变耦合试验研究  

Seepage and Creep Coupling of Landslide Soil under ReservoirWater Action

作　　者：王力[1,2,3,4] 孙文铎 王世梅 胡秋芬[1,2] 陈玙珊[1,2] 南芳芸 WANG Li;SUN Wen-duo;WANG Shi-mei;HU Qiu-fen;CHEN Yu-shan;NAN Fang-yun(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education,China Three Gorges University,Yichang 443002,China;College of Civil Engineering&Architecture,China Three Gorges University,Yichang 443002,China;Badong National Observation and Research Station of Geohazards,China University of Geosciences,Wuhan 430074,China;Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education,Hohai University,Nanjing 210024,China)

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]中国地质大学(武汉)湖北巴东地质灾害国家野外科学观测研究站,武汉430074 [4]河海大学岩土力学与堤坝工程教育部重点实验室,南京210024

出　　处：《长江科学院院报》2024年第2期128-134,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(U21A2031);湖北巴东地质灾害国家野外科学观测研究站开放基金项目(BNORSG-202207);岩土力学与堤坝工程教育部重点实验室开放基金项目(2023003);中国博士后科学基金项目(2021M701969)。

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。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.

关 键 词：水库滑坡 蠕变 渗流 流固耦合 体积应变 

分 类 号：TU41[建筑科学—岩土工程]