NGHIÊN CỨU KHẢ NĂNG CHỊU TẢI CỦA CỌC ỐNG THÉP TRONG NỀN CÁT SẠN SAN HÔ XÉT ĐẾN ẢNH HƯỞNG KHOẢNG CÁCH CÁNH XOẮN=LOAD-BEARING CAPACITY OF STEEL PIPE PILES IN CORAL GRAVELLY SAND CONSIDERING THE EFFECT OF HELICAL PLATE DISTANCE

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Tác giả: Quốc Văn Nguyễn, Thanh Sang Nguyễn, Tương Lai Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Special Construction Engineering, 2024

Mô tả vật lý: tr.63

Bộ sưu tập: Metadata

ID: 251768

Thêm vào giỏ

Các công trình xây dựng trên nền địa chất, đặc biệt là san hô có ý nghĩa quan trọng về an ninh - quốc phòng và phát triển kinh tế biển. Tuy nhiên, đến nay việc áp dụng những công nghệ mới, kết cấu móng cọc cải tiến cho các công trình này còn hạn chế. Bài báo tập trung nghiên cứu đánh giá và xây dựng hàm tương quan giữa khả năng chịu tải của cọc ống thép truyền thống được bổ sung 2 cánh xoắn với sự thay đổi khoảng cách các cánh xoắn đó dọc theo chiều sâu của cọc trong nền cát sạn san hô, các tác giả sử dụng mô hình nền Mohr-Coulomb theo phương pháp phần tử hữu hạn. Kết quả nghiên cứu cho thấy, trong phạm vi nghiên cứu cọc ống thép có 2 cánh xoắn làm tăng khả năng chịu tải từ 2,1 đến 3,3 lần so với cọc tròn trơn truyền thống và kiến nghị khoảng cách cánh xoắn phù hợp cùng với hàm tính toán khả năng chịu tải của cọc đơn ống thép cải tiến trong móng công trình khi xây dựng trong điều kiện địa chất là nền san hô và tính chất thuỷ hải văn đặc trưng trên các vùng biển đảo xa bờ của Việt Nam.Construction projects on geological grounds, particularly coral reefs, hold significant importance for national security, defense, and marine economic development. However, the application of new technologies and enhanced pile foundation structures in these projects has been limited. This study focuses on researching and evaluating the correlation between the load capacity of traditional steel pipe piles, which are supplemented with two helical plates, and the variations in the distance of these helical plates along the depth of the pile in coral gravelly sand using Mohr-Coulomb model by finite element method. The results of this study conclude that the load-bearing capacity of piles with two helical plates is 2.1 to 3.3 times higher than that of traditional plain round piles. In addition, a calculation function for the load-bearing capacity of the improved steel single-pipe pile in relation to the appropriate distance for the helical plates is proposed. This function is essential for projects built under the geological conditions of coral and the typical hydrological properties found in the offshore seas and islands of Vietnam.

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