Phân tích ứng xử cố kết nền đất yếu gia cố PVD có xét đến sự giảm khả năng thoát nước phi tuyến theo chiều sâu

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Tác giả: Bá Phú Nguyễn

Ngôn ngữ: Vie

Ký hiệu phân loại: 624 Civil engineering

Thông tin xuất bản: Tạp chí Khoa học Công nghệ Xây dựng, 2020

Mô tả vật lý: 84-92

Bộ sưu tập: Metadata

ID: 420493

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Nhiều nghiên cứu cho thấy rằng tốc độ cố kết nền đất yếu có gia cố bấc thấm (PVD) chịu ảnh hưởng trực tiếp tới khả năng thoát nước của PVD. Tuy nhiên, khả năng thoát nước của PVD (qw) thường giảm đáng kể theo độ sâu cắm bấc, điều này dẫn đến làm chậm quá trình cố kết trong nền. Bài báo này tiến hành phân tích cố kết thấm đối xứng trục của khối đất trụ tròn có gia cố PVD, trong đó qw được xem như giảm phi tuyến theo chiềusâu cắm PVD. Kết quả phân tích cho thấy rằng sự giảm phi tuyến theo chiều sâu của qw gây cản trở đáng kể cho quá trình cố kết của đất nền, và kết quả này thể hiện rõ hơn ở độ sâu lớn hơn trong nền đất yếu. Tuy nhiên, qw càng lớn thì sự ảnh hưởng này càng nhỏ. Lời giải giải tích được sử dụng phân tích các công trình thực tế với trường hợp chiều dày lớp đất yếu lớn, kết quả cho thấy rằng việc dự đoán ứng xử cố kết xét đến sự giảm phi tuyến của qw cho kết quả phù hợp với dữ liệu quan trắc tại hiện trường., Tóm tắt tiếng anh, Many researchers reported that consolidation rate of prefabricated vertical drain (PVD)-installed ground is closely related to the discharge capacity of PVD (qw), which decreases with increasing lateral effective stress. Therefore, the consolidation procedure of PVD-improved ground can be delayed due to the reduction of qw. This paper carried out an analysis of consolidation of PVD-improved ground considering a variation of qw, in which the nonlinear reduction of qw with depth was considered. The analysis results indicated that the consolidation of PVD-improved ground was significantly delayed with nonlinear reduction of qw. This result was obvious at deep depth in ground. The result also showed that when the qw increased, the effects of reduction of qw with depth on consolidation behavior were insignificant. The analysis was performed on field behavior of embankments on soft deposits with a thick soft ground. The results obtained from the analytical solution considering the nonlinear reduction of qw were in good agreement with the observed data.

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