Nghiên cứu chế tạo cát nhân tạo từ bùn không độc hại nạo vét trong TP Hà Nội

Nghiên cứu chế tạo cát nhân tạo từ bùn không độc hại nạo vét trong TP Hà Nội - Đặc tính kháng cắt

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: TRI THỨC PHẠM, HUY ĐÔNG PHAN, VĂN BA PHAN, THANH TÙNG TRẦN

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.76

Bộ sưu tập: Báo, Tạp chí

ID: 381164

Thêm vào giỏ Liên kết toàn văn

Based on the results of triaxial compression tests under consolidated drained conditions, this paper presents the shear strength characteristics of granular fill material (GFM) produced from dredged sediment in Hanoi City. The GFM material in the experiments was prepared from the same type of sediment (B), cement (X), and polymer (P) under the same conditions and following the same laboratory preparation procedure. The research results show that the shear strength of the GFM material increases with the cement content
at the same strain level, the stress and strain increase with the confining pressure
at low confining pressures, the sample exhibits dilatancy and increases in volume, which gradually decreases and stops completely with increasing confining pressure. At the initial stage of the shearing process, when the strain is still small, the stress ratio decreases sharply with increasing strain, however, immediately after that, the stress ratio increases proportionally with the strain until the sample fails. The GFM material has an internal friction angle ofφ’ = 35°÷38° which is directly proportional to the cement content. Although it is a granular material, the GFM material has a relatively high cohesion value of c’ = (15÷38) kPa, indicating that it differs from natural sand. Keywords: Artificial sand
granular fill material (GFM)
shear strength characteristics.Từ kết quả thí nghiệm nén ba trục theo sơ đồ cố kết, thoát nước, bài báo đã trình bày đặc tính kháng cắt của vật liệu đắp dạng hạt chế tạo từ bùn nạo vét trong TP Hà Nội (Granular Fill Material: GFM). Trong các thí nghiệm vật liệu GFM được chế tạo từ cùng một loại bùn (B), xi măng (X) và polymer (P) ở cùng một điều kiện, theo cùng một quy trình chế bị trong phòng thí nghiệm. Các kết quả nghiên cứu cho thấy khả năng chống cắt của vật liệu GFM tăng theo hàm lượng xi măng
ở cùng một mức biến dạng, ứng suất và biến dạng tăng theo cấp áp lực
khi cấp áp lực nhỏ, mẫu có hiện tượng nở, tăng thể tích, hiện tượng này giảm dần và dừng hoàn toàn khi tăng dần cấp áp lực hông. Tại khoảng thời gian đầu của quá trình cắt, khi biến dạng còn nhỏ, hệ số ứng suất giảm mạnh khi biến dạng tăng, tuy nhiên, ngay sau đó hệ số ứng suất tăng tỷ lệ thuận với biến dạng cho đến khi mẫu phá hoại. Vật liệu GFM có góc ma sát trong ϕ’ ≅ (350 ÷ 380) tỷ lệ thuận với hàm lượng xi măng, là vật liệu rời nhưng lực dính có giá trị khá lớn c’ ≅ (15 ÷ 38) kPa cho thấy vật liệu GFM có sự khác biệt so với cát tự nhiên. Từ khóa: Cát nhân tạo
vật liệu đắp dạng hạt (GFM)
đặc tính kháng cắt.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR