Đánh giá tác động của hạt mịn không dính đến khả năng hóa lỏng của đất cát=Evaluating the effect of non-plastic fine content on the liquefaction potential of sandy soils

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Tác giả: Đức Khiêm Nguyễn, Đồng Kiếm Lam Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.134

Bộ sưu tập: Metadata

ID: 484008

Thêm vào giỏ

Công trình nghiên cứu ảnh hưởng của hàm lượng hạt mịn không dẻo (FC) đến khả năng chống hóa lỏng của đất cát thông qua một loạt thí nghiệm cắt đơn giản tuần hoàn (CDSS). Nghiên cứu xem xét sự hình thành áp lực nước lỗ rỗng thặng dư (EPP) và số chu kỳ tải cần thiết để đạt trạng thái hóa lỏng trong các hỗn hợp cát-hạt mịn với hàm lượng hạt mịn thay đổi từ 0% đến 40%. Kết quả cho thấy EPP có xu hướng tăng theo số chu kỳ tải cho tất cả các mẫu, nhưng tỷ lệ tăng trưởng thay đổi tùy thuộc vào hàm lượng hạt mịn. Đặc biệt, mẫu có 20% hạt mịn cho thấy EPP cao nhất trong các chu kỳ giữa, cho thấy sự tương tác đáng kể giữa cát và hạt mịn ở mức này. Về khả năng chống hóa lỏng, mẫu đất cát sạch (FC = 0%) thể hiện khả năng kháng hóa lỏng cao nhất, yêu cầu nhiều chu kỳ tải nhất để đạt trạng thái hóa lỏng. Tuy nhiên, khi hàm lượng hạt mịn tăng lên 20%, số chu kỳ cần thiết để đạt hóa lỏng giảm mạnh, cho thấy rằng chỉ cần một lượng nhỏ hạt mịn cũng có thể làm giảm đáng kể khả năng chống hóa lỏng. Đáng chú ý, khi hàm lượng hạt mịn vượt quá 30%, khả năng chống hóa lỏng lại được cải thiện, làm nổi bật mối quan hệ phức tạp giữa hàm lượng hạt mịn và hành vi của đất. Những phát hiện này cho thấy hàm lượng hạt mịn đóng vai trò quan trọng trong việc ảnh hưởng đến khả năng hóa lỏng của đất cát. Từ khóa: Khả năng chống hóa lỏng
hàm lượng hạt mịn không dẻo
thí nghiệm cắt đơn giản tuần hoàn
áp lực nước lỗ rỗng thặng dư
chu kỳ tải.This paper investigates the influence of non-plastic fine content (FC)on the liquefaction resistance of sandy soils through a series of cyclic direct simple shear (CDSS) tests. The study examines the development of excess pore water pressure (EPP) and the number of loading cycles required for liquefaction in sand-fine mixtureswith varying fine content (0% to 40%). The results show that EPP tends to increase with the number of loading cycles for all samples, but the rate of increase varies depending on the fine content. Notably, the sample with 20% fine content exhibits the highest EPP during mid-cycles, indicating significant interaction between sand and fine particles at this level. Regarding liquefaction resistance, the clean sand sample (FC = 0%) demonstrates the highest resistance, requiring the most loading cycles to reach liquefaction. However, as the fine content increases to 20%, the number of cycles needed for liquefaction decreases sharply, suggesting thateven a small amount of fine content can significantly reduce liquefaction resistance. Interestingly, when the fine content exceeds 30%, the liquefaction resistance improves again, highlighting the complex relationship between fine content and soil behavior. These findings suggest that fine content plays a critical role in influencing the liquefaction potential of sandy soils. Keywords: Liquefaction resistance
fine content
cyclic direct simple shear test
excess pore pressure
number of cycles.

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