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Direct Shear Test on Cement-Modified Sandy Silt at Negative Temperature

Author: PengGuangTang
Tutor: LiuJianKun
School: Beijing Jiaotong University
Course: Geotechnical Engineering
Keywords: Seasonal permafrost zone Frost heave Cement improved soil Before freezing moisture Direct shear tests Cement ratio Shear strength index
CLC: U412.22
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 0
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Abstract


The most common diseases seasonally frozen subgrade frost heave , and the main reason for the decline of the subgrade soil shear strength due to frost heave generated Frothing Therefore take measures to improve and improve the roadbed soil shear strength become the focus of the Highway cold regions research . This article is west transportation construction projects under dynamic load western road frost heave Frothing mechanism and its control ( 200831879524 ) in a research direction , Qinghai Province seasonal permafrost of State Road 109 line eraser Hill section serious frost heave The Frothing subgrade soil as the object of this study . Early through on-site test of the understanding of disease causes and influencing factors , and indoor test , analysis of cement improved soil frost heave characteristics proposed take the cement modified method of on-site soil and analyze the shear strength of the relevant factors changes in the trend of cement specific incorporation of improved soil conditions . Cement improved soil research , summed up the cement improved soil research and analysis of the domestic and foreign research status on cement improved soil , to carry out the study seasonal permafrost zone cement improved soil shear strength properties have important theoretical value and practical significance . Frost heave characteristics of the soil , carried out in the low - temperature laboratory frost heave test specimen under static loads , research before freezing moisture replenishment conditions , cement ratio heave Character prime soil , test and analysis of frost heave characteristics and cement improved soil frost heave characteristics . Research before freezing moisture related factors affect cement improved soil shear strength , direct shear tests carried out in a low temperature environment cement improved soil cement ratio , the freezing temperature and curing time of cement improved soil shear environment strength characteristics .

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CLC: > Transportation > Road transport > Road works > Planning, surveying and design > Survey > Soil,geological and geographical investigation
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