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谭   俊1 ,2 ,  赵伟玲1 ,2 ,   张正昊3  ,  太娇阳1 ,2 ,  朱小龙1 ,2 ,

王志广1 ,2 ,  吴   斌4 ,  文学渊5

 

(1 . 河北省地质环境监测院 ，石家庄 050021 ;  2.  河北省地质资源环境监测与保护重点实验室 ，石家庄 050021 ;3 .  河海大学 水利水电学院 ，南京 210024 ;  4.  新藏铁路公司筹备组 ，拉萨 850000 ;

5 .  中铁三局集团第四工程有限公司 ，北京 102300)

摘   要 ：为了研究降雨渗透作用对砂质边坡剪切特性的影响 ，通过开展降雨作用下砂质边坡的模型试验，研究了不同降雨强度下砂质边坡不同位置处在降雨全过程的竖向和水平位移变化规律。结果表明： 不同位置砂质边坡土体竖向位移在降雨全过程中表现出先快速后缓慢增加的趋势 ， 同一深度土体竖向位移大小关系为坡顶  > 坡底＞坡中 ；而各位置砂土体水平位移在降雨的不同阶段变化明显 ， 降雨初期坡顶位置处变化明显 ， 降雨中后期水平位移以坡中为主 ；同一法向应力下峰值剪切应力和峰值剪切位移与含水率变化呈负相关 ，含水率的增加使颗粒间的咬合作用降低 ，含水率从 5% 增加至 30% ,  内摩擦角从 34. 4 °减小至 22. 7 °。直剪试验结果较好地验证了降雨渗透作用下砂质边坡的变形特性及失稳机理。

关键词： 降雨渗透 ；模型试验 ；边坡含水率 ；剪切特性

中图分类号：TU391 . 3           文献标志码：A            文章编号： 1005- 8249  (2025)  04- 0068- 07

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .04.013

 

 

TAN Jun1 , 2  ,  ZHAO Weiling1 , 2  ,  ZHANG Zhenghao3  ,  TAI Jiaoyang1 , 2  ,  ZHU Xiaolong1 , 2  ,

WANG Zhiguang1 , 2  ,  WU Bin4 ,  WEN Xueyuan5

( 1 . Hebei Environmental Geology Exploration Institute , Shijiazhuang 050021 , China; 2. Hebei Key Laboratory

of Geological Resources and Environment Monitoring and Protection , Shijiazhuang 050021 , China;

3 . College of Water Conservancy and Hydropower Engineering , Hohai University , Nanjing 210024 , China;

4. Preparatory Group of Xinjiang - Tibet Railway Company , Lasa 850000 , China; 5 . China Railway

No. 3 Engineering Group Fourth Engineering Co . , Ltd. , Beijing 102300 , China)

Abstract : In order to study the influence of rainfall infiltration on the shear characteristics of sandy slopes , this paper conducted a model test of sandy slopes under rainfall to investigate the vertical and horizontal displacement variation laws of sandy slopes at different positions during the entire rainfall process under different rainfall intensifies . The results show that the vertical displacement of the soil on the sandy slope at different positions showed a trend of increasing rapidly at first and then slowly throughout the entire rainfall process . The relationship of the magnitude of the vertical displacement of the soil at the same depth was the top of the slope > the bottom of the slope > the middle of the slope; However , the horizontal displacement of the sandy soil at each position changed significantly at different stages of rainfall. The change was obvious at the top of the slope in the early stage of rainfall , and the horizontal displacement was mainly in the middle of the slope in the middle and later stages of rainfall; Under the same normal stress , the peak shear stress and peak shear displacement are negatively correlated with the change of moisture content. The increase of moisture content reduces the interlocking effect between particles . When the moisture content increases from 5% to 30% , the internal friction Angle decreases from 34. 4 °to 22. 7 °. The direct shear test results have well verified the deformation characteristics and instability mechanism of sandy slopes under rainfall infiltration.

Key words : rainfall infiltration; model test; slope water content; shear characteristics

作者简介：谭   俊  (1982—) ,   男 ，硕士 ，高级工程师 ，研究方向：水文地质 、工程地质 、环境地质。

通信作者：朱小龙  (1981 —) ,  男 ，本科 ，高级工程师 ，研究方向：水文地质 、环境工程。

收稿日期：2025 - 01 - 15