IN-SITU SOAKING TEST ON THE DISTURBED LOESS SITE AT LANZHOU METRO, GANSU PROVINCE, CHINA

LIANG Qingguo; FANG Jun; ZHANG Jindong; ZHANG Yanjie; PU Jianjun; WANG Fei

doi:10.12090/j.issn.1006-6616.2018.24.06.083

Volume 24 Issue 6

Dec. 2018

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Article Navigation > Journal of Geomechanics > 2018 > 24(6): 803-812

LIANG Qingguo, FANG Jun, ZHANG Jindong, et al., 2018. IN-SITU SOAKING TEST ON THE DISTURBED LOESS SITE AT LANZHOU METRO, GANSU PROVINCE, CHINA. Journal of Geomechanics, 24 (6): 803-812. DOI: 10.12090/j.issn.1006-6616.2018.24.06.083

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IN-SITU SOAKING TEST ON THE DISTURBED LOESS SITE AT LANZHOU METRO, GANSU PROVINCE, CHINA

doi: 10.12090/j.issn.1006-6616.2018.24.06.083

LIANG Qingguo^{1, 2
,},
FANG Jun^{2
,
,},
ZHANG Jindong^{2, 3},
ZHANG Yanjie^{1, 2},
PU Jianjun²,
WANG Fei³

1.
National Demonstration Center for Experimental Civil Engineering Education(Lanzhou Jiaotong University), Lanzhou 730070, Gansu, China
2.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
3.
China Railway First Survey & Design Institute Group Co., Ltd., Xi'an 710043, Shannxi, China

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Received: 2017-07-03
Revised: 2018-08-02
Published: 2018-12-01

Abstract

Abstract

The underlying soil under the engineering construction on the levy and removing sites in cities is quite different from the soil on the sites with primitive landform and strata distributions due to the disturbing influence of loading and reloading caused by long-term water seepage from precipitation and drainage, previous construction & demolition, traffic loading and so on. Although there are a lot of published researches on the in-situ soaking test for loess sites, most of which are for the intact loess sites, very little research has been devoted to the disturbed loess sites. An in-situ soaking test on the loess test pit were carried out on the construction site of car depot of rail transit in Donggang, Lanzhou and the observation last for over 100 days. Combined with the laboratory experiments and the in-situ test, the settlement deformation patterns due to the soaking of the loess at this disturbed site were discussed. The results indicate that the characteristics of the settlement deformation of the loess site can be generalized as the process of 'slow increasing-sudden increasing-tending to be stable', and the total settlements are much less than those obtained from other similar studies, which can be interpreted as the broadly-defined humidifying collapsibility including the compressive deformation and collapsible deformation with the approximate proportion of 7:3 between them. The relatively low void ratio caused by previous disturbances and unloading resulted from excavation of test pit are the main reasons that the total settlements are quite small, but much attentions should be paid to the sudden collapsibility settlement during the development of settlement deformation due to soaking and differential settlement due to uneven distribution of soil strata. The result would help to comprehend the collapsible deformation and water stability of loess and provide reference to select the measures of foundation treatment and waterproof & drainage for loess site.
- Lanzhou,
- disturbed site,
- loess,
- in-situ soaking test

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IN-SITU SOAKING TEST ON THE DISTURBED LOESS SITE AT LANZHOU METRO, GANSU PROVINCE, CHINA

doi: 10.12090/j.issn.1006-6616.2018.24.06.083

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IN-SITU SOAKING TEST ON THE DISTURBED LOESS SITE AT LANZHOU METRO, GANSU PROVINCE, CHINA

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