Experimental Study on Strength of Split Grouting Pile Core Stone Body in Collapsible Loess Areas

Abstract

Abstract: In order to study the mechanical properties of the split grouting pile core stone body in the collapsible loess areas, five different grouting grouts with different mix ratios were carried out to test the compressive strength of test blocks of standard maintenance, test blocks of same conditions and pile core stone body of 3 d, 7 d, 14 d, 28 d, 56 d, 90 d. The results show that the compressive strength of the pile core stone body decreases with the increase of the water-binder ratio, and increases logarithmically with the increase of the curing age. The water separation rate of the grouting slurry has a greater impact on the compressive strength of the pile core stone body. The density and moisture content of the loess and the depth of the pile core stone body in the loess have a slight influence on its compressive strength. Based on the influencing factors, correlation of compressive strength between the pile core stone body and the same grout 3 d standard curing test block is derived, which predicts the effect of the foundation reinforcement project in the collapsible loess area, and provides a reference for the compressive strength of the pile core stone body for the foundation reinforcement project in the collapsible loess area.

Key words: collapsible loess, split grouting, pile core stone body, compressive strength, correlation, foundation reinforcement

CLC Number:

TU444

ZHOU Mingru, LI Ning, ZHONG Lin, LI Shaofei. Experimental Study on Strength of Split Grouting Pile Core Stone Body in Collapsible Loess Areas[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1147-1153.

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