粉土与粉质黏土互层中静压桩桩土界面孔隙水压力

doi:10.13278/j.cnki.jjuese.20210041

Abstract

Abstract: In order to study the distribution of pore water pressure at the pile-soil interface in the process of static pressure pile sinking in a layered clay, based on a pile foundation project in Dongying, Shandong Province, a full scale static pressure pile test was carried out. The variation law of pore water pressure at the pile-soil interface was analyzed, the distribution characteristics of excess pore water pressure at the pile-soil interface were discussed, and the dissipation characteristics of pore water pressure and excess pore water pressure at the pile-soil interface were clarified. Combined with the theory of hydraulic fracturing and the theory of hole expansion, the distribution pattern of excess pore water pressure at the pile-soil interface along the direction of pile length during the process of pile sinking was revealed. The experimental results show that pore water pressure and excess pore water pressure are closely related to soil layer properties. Both of them increase slowly in the silt soil layer and faster in the silty clay layer. At the same depth, both of them are obviously dissipated, and the degree of dissipation in silty soil is obviously greater than that in silty clay. The variation law of excess pore water pressure along the direction of pile length calculated by hydraulic fracturing theory combined with hole expansion theory is consistent with the test value. The greater the penetration depth of pile, the closer the theoretical calculation value of excess pore water pressure is to the field measured value.

Key words: jacked pile, pile-soil interface, pore water pressure, excess pore water pressure, field test

CLC Number:

TU473.11

Sang Songkui, Wang Yonghong, Zhang Mingyi, Kong Liang, Wu Wenbing, Chen Zhixiong, Li Zhaolong, Zhang Qijun. Pore Water Pressure at Pile-Soil Interface of Jacked Pile in Silty Soil and Silty Clay[J].Journal of Jilin University(Earth Science Edition), 2021, 51(5): 1551-1559.

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Pore Water Pressure at Pile-Soil Interface of Jacked Pile in Silty Soil and Silty Clay

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