Influencing Factors and Corresponding Values of Ultimate Shaft Resistance and Tip Resistance Coefficients for Piles of Rock-Socketed Sections

LU Xianlong; QIAN Zengzhen; YANG Wenzhi

doi:10.3724/j.gyjzG22091705

Volume 54 Issue 7

Jul. 2024

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LU Xianlong, QIAN Zengzhen, YANG Wenzhi. Influencing Factors and Corresponding Values of Ultimate Shaft Resistance and Tip Resistance Coefficients for Piles of Rock-Socketed Sections[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(7): 181-187. doi: 10.3724/j.gyjzG22091705

Citation:

LU Xianlong, QIAN Zengzhen, YANG Wenzhi. Influencing Factors and Corresponding Values of Ultimate Shaft Resistance and Tip Resistance Coefficients for Piles of Rock-Socketed Sections[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(7): 181-187. doi: 10.3724/j.gyjzG22091705

Citation:

LU Xianlong, QIAN Zengzhen, YANG Wenzhi. Influencing Factors and Corresponding Values of Ultimate Shaft Resistance and Tip Resistance Coefficients for Piles of Rock-Socketed Sections[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(7): 181-187. doi: 10.3724/j.gyjzG22091705

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Influencing Factors and Corresponding Values of Ultimate Shaft Resistance and Tip Resistance Coefficients for Piles of Rock-Socketed Sections

doi: 10.3724/j.gyjzG22091705

1. China Electric Power Research Institute, Beijing 100192, China;
2. China University of Geosciences, Beijing 100083, China

Received Date: 2022-09-17
Available Online: 2024-08-16

Abstract

Abstract

The assumed composition of the ultimate compression and uplift bearing capacity of rock-socketed piles is essentially the same in current Chinese codes. In addition, the same method is adopted to calculate the ultimate shaft resistance and tip resistance of piles for rock-socketed sections by using the ultimate shaft resistance coefficient ξ_s and tip resistance coefficient ξ_b to multiply uniaxial compressive strength f_ucs of rock. However, the values of the aforementioned ξ_s and ξ_b in the criteria are quite different. Based on test data of rock-socketed piles under compression loads, influence laws of pile diameters, rock-socketed depths, ratios of rocketed depths to diameters, and uniaxial strength of rock on ultimate shaft resistance and shaft resistance coefficients as well as ultimate tip resistance and ultimate tip resistance coefficients of rock-socketed sections were analyzed. It was indicated that there was no significant correlation between pile diameters and ultimate shaft resistance coefficients as well as ultimate tip resistance coefficients of rock-socketed piles. With increase in rock-socketed depths and ratios of rocketed depths to diameters, the ultimate shaft resistance and ultimate tip resistance of rock-socketed piles generally decreased. There was an optimum rock-socketed depths and a ratio of rocketed depths to diameters, which could make the ultimate shaft resistance and tip resistance of rock-socketed sections played their roles most fully and coordinately. The ultimate shaft resistance and tip resistance increased but the ultimate shaft resistance coefficients and tip resistance coefficients decreased with increase in the uniaxial compressive strength of rock. The strength of rock was a significant factor to determine the coefficients of shaft resistance and tip resistance. There was a good statistical correlation between them, which could be respectively fitted as ξ_s=0.436 f_ucs^-0.68 and ξ_b=4.183 f_ucs^-0.79.

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References(26)

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