Ảnh hưởng của hàm lượng hạt nhựa tới khả năng hóa lỏng của cát: tải trọng tuần hoàn

Meisam Goudarzy1, Debdeep Sarkar1, Torsten Wichtmann1
1Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Ruhr-Universität Bochum, Bochum, Germany

Tóm tắt

Tóm tắtBài báo trình bày một nghiên cứu thực nghiệm về tác động của hàm lượng hạt nhựa tới hành vi không thoát nước và khả năng hóa lỏng của hỗn hợp cát-hạt nhựa dưới tải trọng tuần hoàn. Kết quả của các thí nghiệm trục quay không thoát nước được tiến hành trên các hỗn hợp cát Hostun với các hàm lượng (0–20%) và loại hạt nhựa (đất sét và bentonite calcigel) khác nhau sẽ được trình bày. Các mẫu thí nghiệm được chuẩn bị với các mật độ ban đầu khác nhau bằng phương pháp nén ẩm, được nén dưới áp lực hiệu quả đồng nhất là 100 kPa và chịu tác động của các biên độ ứng suất sai khác nhau. Từ các quan sát thực nghiệm, phát hiện rằng các hỗn hợp cát-đất sét với hàm lượng 10% hoặc 20% đất sét cho thấy khả năng chống hóa lỏng tuần hoàn thấp hơn so với cát nguyên chất. Hơn nữa, sự giảm tỷ lệ ứng suất tuần hoàn dẫn đến hóa lỏng sau hai mươi chu kỳ lớn hơn đối với hỗn hợp cát-đất sét so với cát-bentonite calcigel. Những lời giải thích khả thi được cung cấp.

Từ khóa


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