[1]祁昊,冯文凯,陈建峰,等.降雨作用下欢喜坡冰水堆积体角砾土强度特性[J].水文地质工程地质,2017,44(4):78-84.
 QI Hao,FENG Wenkai,CHEN Jianfeng,et al.Strength characteristics of the breccia soil in the Huanxipo outwash deposit under rainfall[J].Hydrogeology & Engineering Geology,2017,44(4):78-84.
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降雨作用下欢喜坡冰水堆积体角砾土强度特性()
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《水文地质工程地质》[ISSN:1000-3665/CN:11-2202/P]

卷:
44卷
期数:
2017年4期
页码:
78-84
栏目:
OA栏目
出版日期:
2017-07-15

文章信息/Info

Title:
Strength characteristics of the breccia soil in the Huanxipo outwash deposit under rainfall
作者:
祁昊12冯文凯2陈建峰13白慧林2周强2曾琇舒2
1 同济大学地下建筑与工程系,上海200092;2 成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川 成都610059;3 同济大学岩土及地下工程教育部重点实验室,上海200092
Author(s):
QI Hao12 FENG Wenkai2 CHEN Jianfeng13 BAI Huilin2 ZHOU Qiang2 ZENG Xiushu2
1 Department of Geotechnical Engineering, Tongji University, Shanghai200092, China; 2 State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, Sichuan610059, China; 3 Key laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai200092, China
关键词:
冰水堆积体角砾土降雨现场剪切试验非饱和土强度
Keywords:
breccia soil in outwash deposits rainfall in-situ shear test unsaturated soil shear strength
分类号:
TU413.1
文献标志码:
A
摘要:
为探究降雨作用下欢喜坡冰水堆积体角砾土的强度变化规律,进行了天然和4种不同降雨历时条件下的角砾土现场剪切试验,并结合土水特征曲线探讨了该类特殊土体的非饱和强度特性。降雨作用对欢喜坡冰水堆积体角砾土的抗剪强度有着显著的影响,其近似饱和时的黏聚力和内摩擦角比天然含水率情况分别降低64.3%和22.5%;降雨入渗使角砾土基质吸力迅速降低,因此在短时强降雨条件下会导致角砾土抗剪强度丧失过大,容易诱发浅层土体滑坡;建立了欢喜坡冰水堆积体角砾土非饱和黏聚力与含水率参数χ(w)的关系式,实际应用时可采用多项式函数来确定χ(w)。
Abstract:
In order to investigate the variation in strength of the breccia soil in the Huanxipo outwash deposit under the action of rainfall, in-situ shear tests of the breccia soil are conducted under the natural condition and under four different rainfall duration conditions. The unsaturated strength characteristics of this special soil are discussed by combining the soil water characteristic curve. Rainfall has a significant effect on the shear strength of the breccia soil in the Huanxipo outwash deposit. When it is approximately saturated, the cohesion and internal friction angle are 64.3% and 22.5% respectively lower those in the case of natural water content. The infiltration of rainfall rapidly reduces the matric suction of the breccia soil, and the heavy rainfall in a short time will lead to too much loss of the shear strength of the soil, which is liable to induce the landslide of the shallow soil. The equation of the relationship between the unsaturated cohesion and the water content parameter χ(w)of the breccia soil in the Huanxipo outwash deposit is established. In practice, the polynomial function can be used to determine the parameter χ(w).

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备注/Memo

备注/Memo:
收稿日期: 2016-12-04; 修订日期: 2017-02-13
基金项目: 国家自然科学基金项目资助(41572291)
第一作者: 祁昊(1994-),男,硕士研究生,主要从事岩土加固与测试工作。E-mail:1393601984@qq.com
通讯作者: 冯文凯(1974-),男,教授,博士生导师,主要从事区域稳定及与岩体稳定以及地质灾害评价与防治教学与研究工作。E-mail:fwkhyl@163 com
更新日期/Last Update: 2017-07-15