超长大直径钻孔灌注桩桩端后压浆试验研究

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Abstract For the reason of construction，some deterring factors will be brought out such as residue and mud cake for bored pile. Post grouting under pile tip can reduce the deterring factor，and the bearing performance of the bored pile will be improved. Effect on the bearing performance of the super-long and large-diameter bored pile by post grouting under the pile tip was studied by a series of tests including the static loading test，CT test and coring test. The self-balanced method was adopted in the static loading test. The bearing performances of the same pile before grouting and after grouting were compared. In the same field，the bearing performances of the piles were compared. Dimensions of the piles were the same，one had been post grouted under the pile tip and the other had not been post grouted. According to the results of the static loading tests，the resistance of the pile tip was raised，and the friction of a finite scope of pile side above pile tip was also raised. So the whole bearing capacity of the pile was raised. By the post grouting under the pile tip，not only the bearing capacity of the whole pile was raised，but also the rigidity of the pile was raised which make the settlement of pile be easier to control. CT test and coring test both approved the effect of post grouting under pile tip. The effect of post grouting would be better when the grout was injected in the sand layer.

Key words： soil mechanics bored pile pile tip post grouting static loading test bearing capacity

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	Articles by authors
	CHENG Ye1
	2
	GONG Weiming1
	ZHANG Xigang3
	DAI Guoliang1

Cite this article:

CHENG Ye1,2,GONG Weiming1, et al. EXPERIMENTAL RESEARCH ON POST GROUTING UNDER SUPER-LONG AND LARGE-DIAMETER BORED PILE TIP[J]. , 2010, 29(S2): 3885-3892.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3885

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