Soil Engineering and Foundation

Soil Engineering and Foundation ›› 2019, Vol. 33 ›› Issue (6): 690-692.

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Shear Strength Characteristics of Fill Soil Grouted Through Steel Pipes

The shear strength characteristics of fill soil grouted through steel pipes and conventional permeable grouting methods are studied throughout laboratory and field direct shear tests. This paper presents the comparative studies of grouted soils from a building site in Zhuzhou City, Hunan Province. The laboratory studies were concentrated on the grouting reinforcement through steel pipes and the cement slurry in the soil on the shear strength. The test results indicated that the grouting reinforcement can enhance the shear strength of improved soil to 1.29 times of the original soils. The shear strength of soil improved with permeable grouting was proportional to the cement content. When the cement ratio is at 6%, the shear strength of improved soil could be twice of the original soils. The field insitu tests indicated that the grouting improved soil could have a shear strength nine times of the original soils. It is therefore concluded that, in addition to the grouted column formed through the grout operation and the soil shear strength improvement, the cementation of cement slurry between the boulders, gravels and other material could also contribute the shear strength increase.   

  1. (1.School of Geosciences and InfoPhysics, Central South University, Changsha 410083;
    2.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083;
    3.Zhuzhou Xiangjian Real Estate Development Co. Ltd., Zhuzhou, 412000)
  • Received:2019-03-11 Revised:2019-04-07 Online:2019-12-28 Published:2019-12-28

Abstract: The shear strength characteristics of fill soil grouted through steel pipes and conventional permeable grouting methods are studied throughout laboratory and field direct shear tests. This paper presents the comparative studies of grouted soils from a building site in Zhuzhou City, Hunan Province. The laboratory studies were concentrated on the grouting reinforcement through steel pipes and the cement slurry in the soil on the shear strength. The test results indicated that the grouting reinforcement can enhance the shear strength of improved soil to 1.29 times of the original soils. The shear strength of soil improved with permeable grouting was proportional to the cement content. When the cement ratio is at 6%, the shear strength of improved soil could be twice of the original soils. The field insitu tests indicated that the grouting improved soil could have a shear strength nine times of the original soils. It is therefore concluded that, in addition to the grouted column formed through the grout operation and the soil shear strength improvement, the cementation of cement slurry between the boulders, gravels and other material could also contribute the shear strength increase.

Key words: Grouting Through Steel Pipes, Fill Soils, Laboratory and Field Tests

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