[1]杨志全,丁 攀,雨德聪,等.基于孔隙率的延安黄土抗剪强度模型[J].山地学报,2019,(03):392-399.[doi:10.16089/j.cnki.1008-2786.000432]
　YANG Zhiquan,DING Pan,YU Decong,et al.Shear Strength of Yan'an Loess Interpreted by Porosity[J].Mountain Research,2019,(03):392-399.[doi:10.16089/j.cnki.1008-2786.000432]
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基于孔隙率的延安黄土抗剪强度模型()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2019年03期
页码:
392-399
栏目:
山地灾害
出版日期:
2019-07-20

文章信息/Info

Title:
Shear Strength of Yan'an Loess Interpreted by Porosity
文章编号:
1008-2786-(2019)3-392-08
作者:
杨志全1; 丁 攀2; 雨德聪1; 杨 溢1*; 朱颖彦3; 韩用顺4
1.昆明理工大学 公共安全与应急管理学院,昆明 650093; 2.昆明理工大学 国土资源工程学院,昆明 650093; 3.中国科学院、水利部成都山地灾害与环境研究所,成都 610041; 4.湖南科技大学 资源环境与安全工程学院,湘潭 411201
Author(s):
YANG Zhiquan1;  DING Pan2;  YU Decong1;  YANG Yi1*;  ZHU Yingyan3;  HAN Yongshun4
1. Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, China; 2. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China; 3. Chengdu Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China; 4. College of Resources, Environment and Safety engineering, Hunan University of Science and Technology, Xiangtan 411201, China
关键词:
延安;  黄土;  孔隙率;  粘聚力;  内摩擦角;  抗剪强度
Keywords:
Yan'an;  Loess;  porosity;  cohesion;  internal friction angle;  shear strength
分类号:
TU 444
DOI:
10.16089/j.cnki.1008-2786.000432
文献标志码:
A
摘要:
孔隙率对黄土抗剪强度具有非常重要的影响,然而,孔隙率对黄土抗剪强度影响效果的认识并不充分。本文以陕西省延安黄土为研究对象,开展不同孔隙率的黄土直剪试验研究,探讨了孔隙率对粘聚力与内摩擦角的定量变化关系; 并以此为基础,构建了基于孔隙率的延安黄土抗剪强度模型,并对其进行了验证。研究结果表明:(1)延安黄土粘聚力与孔隙率间呈幂函数变化关系;(2)延安不同孔隙率黄土内摩擦角取值呈现出两个区间,当孔隙率n≥0.4时,其内摩擦角在25±2.5°的范围内变动,而当孔隙率n<0.4时,其内摩擦角在29.5±2°的范围内变动;(3)通过分析得到了基于孔隙率的延安黄土抗剪强度模型,且该模型得到的黄土抗剪强度理论值与实测值间的误差较小,相对误差均在7%以内,具有较高的精确度。研究成果不仅能为延安黄土抗剪强度研究等提供技术支持,而且还能为该地区的工程建设等方面提供理论参考。
Abstract:
Porosity has a very important effect on the shear strength of loess. However, the specific effect of porosity on the shear strength of loess is not fully understood. In this paper, the Yan'an loess in Shaanxi Province was taken as research object, and a series of direct shear tests of loess with different porosity were carried out. The quantitative relationship between porosity with internal friction angle as well as cohesive force were carefully discussed. Based on this, a shear strength model of Yan'an loess based on porosity was constructed and verified by comparison with observations. By this research, it found that:(1)there was a power function relationship between cohesion and porosity of Yan'an loess; The values of internal friction angles of Yan'an could be defined by two sections in terms of certain porosity. As porosity n≥0.4, its internal friction angle varied within the range of 252.5 whereas as porosity n<0.4, its internal friction angle changed within the range of 29.52;(3)Through analysis, the Yan'an loess shear strength model based on porosity was obtained, and the errors between theoretical values and measured values of loess shear strength obtained by the model was small, with a relative error lower than 7%, suggesting the high accuracy of the model. The research results can not only provide technical support for the shear strength research of Yan'an loess, but also provide theoretical reference for the engineering construction in this area.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-05-05; 改回日期(Accepted date):2019-06-26
基金项目(Foundation item):云南省万人计划“青年拔尖人才”专项(YNWR-QNBJ-2018-321); 国家自然科学基金联合基金重点项目(U1502232); 国家自然科学基金项目(41402272); 中国地质调查局西安地质调查中心科研项目([2018]01-21)。[Yunnan Ten Thousand Talents Plan Young & Elite Talents Project(YNWR-QNBJ-2018-321); National Natural Science Foundation Joint Fund Key Project(U1502232); National Natural Science Foundation of China(41402272); Research Project of Xi'an Geological Survey of China Geological Survey([2018]01-21)]
作者简介(Biography):杨志全(1983-),男,博士,教授,主要研究方向:灾害起动机理与水土保持方面研究。[YANG Zhiquan(1983-), male, Ph.D, professor, research on disaster start mechanism and soil and water conservation research] E-mail: yzq1983816@163.com
*通讯作者(Corresponding author):杨溢(1965-),男,博士,教授,主要研究方向:灾害起动机理与水土保持方面研究。[YANG Yi(1965-), male, Ph.D, professor, specialized in hydrology, disaster start mechanism and soil and water conservation research] E-mail: 2919847230@qq.com
更新日期/Last Update: 2019-05-30