Phân tích ứng xử cố kết nền đất yếu có lớp cát mỏng gia cố bằng bấc thấm=Consolidation analysis of pvd-improved soft ground with presence of sand seam layers

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Bá Phú Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ (ĐH Công nghiệp TP. HCM), 2024

Mô tả vật lý: tr.97-107

Bộ sưu tập: Metadata

ID: 245003

Thêm vào giỏ

In soft ground engineering, the thin sand layer (or sand seam) in the soft soil layer can be formed naturally or artificially. The thin sand layer is deposited in the natural ground between clay layers (e.g., Busan clay). However, the effects of sand seam on consolidation behavior (settlement and pore water pressure dissipation) predicted from analytical models was often ignore due to the complexity in those analytical solutions. Therefore, this paper carries out an analysis of the consolidation behavior of the composite foundation of prefabricated vertical drains (PVDs) system combined with thin sand layer system. A series of numerical analysis is conducted to analyze the influence of thin sand layer on the consolidation settlement of the composite foundation. Analytical solution is also performed and compared with the results of numerical simulations. The obtained results show that the consolidation process of soft ground with the thin sand layer presence occurs faster than that of soft ground without sand seam (or homogeneous ground). The consolidation rate of composite ground depends on the quantity of thin sand layers in the ground. The presence of a thin layer of sand also affects the dissipation of excess pore water pressure in the horizontal direction. The results of numerical analysis show that the settlement of soft ground with the thin sand layer is smaller than that of soft ground without sand seam layer. When the total thickness of the thin sand layers in composite foundation is the same, the settlements tend to be the same.Thực tế, trong một số trường hợp lớp cát mỏng phân bố trong nền tự nhiên giữa các lớp sét có chiều dày lớn (ví dụ như sét Busan). Tuy nhiên quá trình dự báo lún và phân tích sự tiêu tán áp lực nước lỗ rỗng thường bỏ qua lớp cát mỏng này do sự phức tạp trong một số lời giải giải tích. Do đó, bài báo này tiến hành phân tích ứng xử cố kết của nền với hệ thống bấc thấm đứng (PVD) kết hợp với hệ thống lớp cát mỏng. Một số mô phỏng số sẽ được tiến hành để phân tích ảnh hưởng của đặc điểm lớp cát mỏng đến quá trình lún cố kết của nền. Lời giải giải tích cũng được thực hiện và so sánh với kết quả của mô phỏng số. Các kết quả phân tích đều cho thấy nền có sự hiện diện lớp cát mỏng xảy ra quá trình cố kết nhanh hơn, tốc độ cố kết phụ thuộc vào số lượng lớp cát mỏng trong nền. Sự hiện diện lớp cát mỏng cũng ảnh hưởng đến sự tiêu tán áp lực nước lỗ rỗng tăng thêm theo phương ngang. Kết quả phân tích số cho thất nền có sự hiện diện lớp cát mỏng có độ lún nhỏ hơn nền đồng nhất và độ lún này có xu hướng bằng nhau khi tổng chiều dày của các lớp cát mỏng bằng nhau.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR