Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Đặc tính biến dạng động của đất sét đông lạnh dưới sự quay trục ứng suất chính thuần túy
Tóm tắt
Trong thực tế, sự quay trục ứng suất chính là một hiện tượng phổ biến được gây ra bởi tải trọng động. Việc xác định các đặc tính biến dạng động của đất đông lạnh là vô cùng quan trọng để thiết kế một cấu trúc có xem xét sự quay trục ứng suất chính dưới điều kiện tải trọng đa trục. Trong nghiên cứu này, các thí nghiệm cắt xoay tần suất chu kỳ đã được thực hiện với sự xem xét các quay trục của trục ứng suất chính đối với các giá trị khác nhau của CSR và tần số, bằng cách sử dụng thiết bị xilanh rỗng đông lạnh (FHCA-300) để điều tra các đặc điểm biến dạng động của đất sét đông lạnh. Từ các kết quả thí nghiệm, các đặc điểm phát triển của biến dạng nhựa tích lũy, các vòng chu trình, mô đun đàn hồi động và tỷ số tiêu tán đã được phân tích. Các phát hiện đã chỉ ra rằng việc tăng CSR làm tăng tốc độ phát triển của biến dạng nhựa tích lũy, suy giảm độ cứng và làm tăng năng lượng tiêu tán. Tần số tải thấp hơn dẫn đến biến dạng nhựa tích lũy lớn hơn tại một chu kỳ tải nhất định, sự suy giảm độ cứng tăng lên khi tần số tải giảm và khả năng hấp thụ năng lượng tiêu tán cũng tăng theo. Hơn nữa, mô đun đàn hồi giảm đáng kể vào giai đoạn đầu của tải trọng, sau đó nó từ từ tăng lên. Điều này ngụ ý rằng một cấu trúc đất ổn định đã được hình thành thông qua những thay đổi liên tục trong hướng phân tử, sự định hình lại và tái sắp xếp trong suốt những chu kỳ đầu tiên và rằng tải trọng chu kỳ đã thúc đẩy việc làm dày mẫu vật.
Từ khóa
#biến dạng động #đất sét đông lạnh #quay trục ứng suất chính #thí nghiệm cắt xoay tần suất chu kỳTài liệu tham khảo
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