含水率及干湿循环作用对青海湖西岸“水草地”粉土的抗剪强度指标的影响研究  

Influence of Moisture Content and Drying-Wetting Cycles on the Shear Strength of Silty Soil Sample from“Meadow Land”in the West Bank of Qinghai Lake

作　　者：连小良 刘建正 钟小春 杨启慧 廖燚 张蕾[5] LIAN Xiaoliang;LIU Jianzheng;ZHONG Xiaochun;YANG Qihui;LIAO Yi;ZHANG Lei(The 23rd Metallurgical Construction Group Co.Ltd.,China Minmetals,Changsha 410014;Qinghai China Railway Highway Construction Management Co.Ltd.,China Minmetals,Xining 810000;China Railway No.5 Engineering Group Co.Ltd.,Guiyang 550003;Qinghai Provincial Transportation Planning Design and Research Institute Co.Ltd.,Xining 810000;School of Construction Engineering,Kunming University of Science and TechnologyKunming 650500)

机构地区：[1]五矿二十三冶建设集团有限公司,长沙410014 [2]青海五矿中铁公路建设管理有限公司,西宁810000 [3]中铁五局集团有限公司,贵阳550003 [4]青海省交通规划设计研究院有限公司,西宁810000 [5]昆明理工大学建筑工程学院,昆明650500

出　　处：《土工基础》2022年第5期791-795,共5页Soil Engineering and Foundation

基　　金：青海省科技成果转化专项项目(2021-SF-168)。

摘　　要：以沿青海湖西岸建设的公路工程实例为研究背景,以青海湖西岸典型“水草地”粉土为研究对象,通过土工试验、干湿循环试验及直剪试验,研究含水率及干湿循环作用对粉土的抗剪强度及其指标的影响规律。研究表明,原状粉土的抗剪强度指标c、φ值随含水率的增加先增大后减小,抗剪强度的最优含水率约为30%;重塑粉土的c、φ值及抗剪强度随干湿循环次数的增加而降低,当循环超过5次后,含水率对抗剪强度基本没有影响。This paper presents a highway construction engineering case history along the west bank of Qinghai Lake.The study selected a typical silty soil from the“Meadow Land”from the west bank of Qinghai Lake.The influence of the moisture content and the drying and wetting cycles on the shear strength parameters was evaluated throughout the index property tests,drying and wetting tests and dire shear tests.The results show that the shear strength indices C andφof the unmodified silt first increase and then decrease with the increase of moisture content,and the optimal moisture content in the soil sample for the best the shear strength is about 30%.The values of C,φand the shear strength of remolded silt decrease with the increase of wetting-drying cycles.When the cycles exceed 5 times,the moisture content has little effect on the shear strength.

关 键 词：青海湖 水草地 含水率 干湿循环作用 抗剪强度指标 

分 类 号：TU411[建筑科学—岩土工程]