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Số người truy cập: 107,023,807

 Evaluating the Performance of Large Diameter Bored Piles Socketed in Weathered Rock
Tác giả hoặc Nhóm tác giả: Do Huu Dao1, Tran Q. Thien1, Surya S. C. Congress2, Anand J. Puppala2, Nguyen Minh Hai3, Young Sang Kim4
Nơi đăng: Indian Geotechnical Journal (Springer); Số: ISSN 0971-9555 (Q3);Từ->đến trang: 1-12;Năm: 2022
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The current design practice of the bored piles socketed in rock often ignores the end-bearing resistance and relies only on the side shaft resistance. This is due to the accumulation of soft soils as a result of improper cleaning of the slurry suspension at the bottom of the pile construction. This design practice significantly increases the length and cost of the pile foundation. The current study presents the bidirectional load test results on the large diameter bored piles socketed in weak rocks at the Cua Dai bridge project, Quang Ngai province, Vietnam. The soil profile consists of medium loose to very dense silty sand underlain by the weathered granite rock. The test results and analyses showed that the ultimate shaft resistance and the maximum end-bearing resistance of the granite rock layer are much smaller than those estimated from the unconfined compressive strength of intact rock. The low shaft resistances are attributed to the presence of the slurry filter cake at the interface between the pile shaft and surrounding rock, while the low toe resistances are due to the presence of the soft soils below the pile toe. The importance of the allowable pile toe settlement and the presence of soft soils below pile toe have been addressed to consider the inclusion of end-bearing resistances in design
ABSTRACT
The current design practice of the bored piles socketed in rock often ignores the end-bearing resistance and relies only on the side shaft resistance. This is due to the accumulation of soft soils as a result of improper cleaning of the slurry suspension at the bottom of the pile construction. This design practice significantly increases the length and cost of the pile foundation. The current study presents the bidirectional load test results on the large diameter bored piles socketed in weak rocks at the Cua Dai bridge project, Quang Ngai province, Vietnam. The soil profile consists of medium loose to very dense silty sand underlain by the weathered granite rock. The test results and analyses showed that the ultimate shaft resistance and the maximum end-bearing resistance of the granite rock layer are much smaller than those estimated from the unconfined compressive strength of intact rock. The low shaft resistances are attributed to the presence of the slurry filter cake at the interface between the pile shaft and surrounding rock, while the low toe resistances are due to the presence of the soft soils below the pile toe. The importance of the allowable pile toe settlement and the presence of soft soils below pile toe have been addressed to consider the inclusion of end-bearing resistances in design
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