Nghiên cứu khả năng đầm chặt và kháng cắt của đất gia cường bằng sợi PP

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: NHƯ ÁNH DƯƠNG NGUYỄN, SỸ HÙNG NGUYỄN, THỊ PHƯƠNG HUYỀN TRẦN

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.156

Bộ sưu tập: Metadata

ID: 452102

Thêm vào giỏ Liên kết toàn văn

Bài báo tập trung vào ứng xử của đất cát pha sét gia cường bằng sợi PP (Polypropylene). Đất thí nghiệm được tạo từ hỗn hợp 70% cát và 30% bụi và sét, sau đó được phối trộn với sợi PP có ba chiều dài khác nhau (10, 15 và 20mm) ở các tỷ lệ khối lượng khác nhau (0.5, 1, và 1.5%). Trước hết, với từng tổ hợp chiều dài sợi - tỷ lệ sợi, đất gia cường được thí nghiệm đầm chặt để xác định độ ẩm tối ưu và dung trọng khô lớn nhất. Sau đó tiến hành các thí nghiệm cắt trực tiếp và thí nghiệm nén ba trục CU trên các mẫu được đầm chặt tối đa theo kết quả thí nghiệm đầm chặt. Việc chuẩn bị vật liệu và mẫu thí nghiệm theo một quy trình chặt chẽ để tạo ra các mẫu với sợi được phân bố đều theo thể tích, hướng của sợi phân tán đều theo các phương. Kết quả thí nghiệm cho thấy việc trộn sợi PP vào đất cát pha sét có thể cải thiện đáng kể các thông số của đất bao gồm dung trọng khô lớn nhất, lực dính và góc ma sát trong thí nghiệm cắt đất trực tiếp, ứng suất lệch tối đa và biến dạng tương ứng trong thí nghiệm nén ba trục CU. Các thông số trên đạt giá trị lớn nhất khi hàm lượng sợi là 1% và chiều dài sợi là 15mm đến 20mm. Tuy nhiên, các thông số trên sẽ cho giá trị nhỏ nhất nếu hàm lượng sợi cao (1,5%) và chiều dài sợi lớn nhất 20mm. Từ khóa: Gia cường sợi
polypropylene
thí nghiệm ba trục
thí nghiệm đầm chặt
thí nghiệm cắt trực tiếp.This study examines the impact of Polypropylene (PP) fibers on clayey sand soil reinforcement. The experimental soil consisted of a mixture of 70% sand and 30% silt and clay, with PP fibers of 10, 15, and 20mm in length. The fibers were mixed into the soil in three weight ratios of 0.5%, 1%, and 1.5%. Initially, the reinforced soil was tested for compaction to determine the optimal moisture content and maximum dry density for each combination of fiber length and ratio. Next, direct shear tests and CU triaxial compression tests were conducted on maximally compacted samples based on the compaction test results. The preparation of materials and experimental samples followed a meticulous and strict process to create samples with fibers evenly distributed in volume and direction. The results showed a significant increase in soil parameters such as maximum dry density, cohesion, and friction angle in the direct soil shear test when PP fibers were mixed with clayed sand. The maximum deviatoric stress and corresponding strain in the CU triaxial compression test also increased. These parameters reached their highest value when the fiber content was 1% and the fiber length was 15mm to 20mm. However, if the fiber content was high (1.5%) and the maximum fiber length was 20mm, the above parameters would give the smallest value. Keywords: Fibre-reinforced
triaxial test
compaction test
polypropylene fiber
direct shear test.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR