膨润土改性砂土工程性质及其在盾构施工中的应用

doi:10.11896/cldb.19070200

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Abstract Because of the characteristics of sand soil, such as small cohesion, large friction, loose structure and so on, many engineering risks are often caused. In shield construction, the sand soil is generally treated with conditioner. However, due to the lack of understanding of the enginee-ring properties of the modified sand, there are still large problems in the construction, such as large tool wear, pressure chamber blockage, unearthing and so on. In order to study the change rule of permeability coefficient, shear strength and slump of the soil in the process of improving the water rich sand layer with bentonite slurry, the mix proportion test, the soil improvement test and the efficiency test of the admixture were carried out for the soil in the water rich sand layer, and the reliability of the test results was verified with the typical engineering application. The results show that: (i) The viscosity and specific gravity of the sodium-bentonite mud at the same mass fraction are better than that of the calcium-based bentonite. When the mass fraction of bentonite mud is more than 11.0%, the viscosity of the mud increases significantly with the expansion time, and the optimum expansion time of the bentonite mud is 16—18 h; (ii) The permeability coefficient of soil decreases nonlinearly with the increase of slurry injection ratio, and the friction angle, cohesion and collapse of soil are linearly related to the slurry injection ratio. Among them, the improved internal friction angle and cohesion of gravel sand are most sensitive to the change of slurry injection ratio; (iii) The incorporation of cellulose sodium in the process of bentonite mud expansion can improve the mud performance, and the incorporation of Q₃ loess in the sand improvement process can significantly improve the soil improvement effect.

Key words： earth pressure balance shield water rich sand layer soil improvement test bentonite mud site excavation

Published: 14 July 2020

CLC number:

TU521.1

Fund:This work was financially supported by the Natural Science Foundation of China (51408463), Shaanxi Provincial Department of Education Special Scientific Research Project (17JK0424).

About author:: Yuan Mei, associate professor of Xi'an University of Architecture and Technology, graduated from Xi'an University of Architecture and Technology in June 2013 with a Ph.D. degree in engineering. He is mainly engaged in the research and teaching of civil engineering construction and management. In recent years, he has presided over 1 National Natural Science Fund project, 1 provincial and ministerial level scientific research project, 4 departmental and bureau level projects, 1 monograph published, and participated in the Shaanxi Provincial Standard and participated in the construction operation guide. More than 30 papers have been published in high-level journals or conferences at home and abroad, and more than 10 national patents have been approved.
Xinyu Tian, a postgraduate student of Xi'an University of Architecture and Technology. Mainly engaged in the study of civil engineering construction and geotechnical mechanics.

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	MEI Yuan
	TIAN Xinyu
	HU Changming
	LIU Jianguo
	YANG Yunfei
	ZHU Jun

Cite this article:

MEI Yuan,TIAN Xinyu,HU Changming, et al. Engineering Properties of Bentonite Modified Sand and Its Application in Shield Construction[J]. Materials Reports, 2020, 34(14): 14087-14092.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19070200 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14087

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