Khả năng chống lỏng của hỗn hợp cát và tro bay tăng cường bởi sợi polypropylene dưới thử nghiệm triaxial tuần hoàn kiểm soát biến dạng

Innovative Infrastructure Solutions - Tập 7 - Trang 1-24 - 2022
Deepak Kumar1, Siddhartha Sengupta1
1Civil & Environmental Engineering, Birla Institute of Technology, Mesra, Ranchi, India

Tóm tắt

Bài báo này khám phá ảnh hưởng của việc thêm hạt mịn (tro bay) và tăng cường polypropylene để giảm thiểu khả năng lỏng hóa của cát. Những phát hiện trước đây về lỏng hóa của cát dưới tác động của hạt mịn dường như là mâu thuẫn và trái ngược nhau. Nghiên cứu hiện tại cố gắng nhận ra tác động của tro bay (hạt mịn không nhựa) trong việc kháng lại sự nhạy cảm với lỏng hóa của cát bằng cách tiến hành các thử nghiệm triaxial tuần hoàn kiểm soát biến dạng trên các mẫu được tăng cường bằng sợi polypropylene và không được tăng cường. Tro bay được trộn lẫn với các tỉ lệ khác nhau (đến 50%) so với trọng lượng khô của cát. Ba bộ thí nghiệm độc lập đã được thực hiện trên hỗn hợp cát-tro bay. Trong bộ thứ nhất, hỗn hợp cát-tro bay không có tăng cường; thứ hai bằng cách thêm sợi polypropylene @ 0.5% trọng lượng của cát; và bộ thứ ba bằng cách trộn sợi trong tỷ lệ trên, xem xét tổng trọng lượng của hỗn hợp cát-tro bay. Các mẫu được thử nghiệm dưới biến dạng trục 0.5% (biến dạng cắt 0.75%) và tần số 1 Hz. Kết quả được tóm tắt để hiểu tác động của các yếu tố khác nhau như hàm lượng tro bay, độ rỗng tương đối, và sự tăng cường lên lỏng hóa. Kết quả chỉ ra rằng có một mối tương quan không nhất quán giữa khả năng chống lỏng hóa của cát và tỷ lệ hàm lượng tro bay. Số chu kỳ để khởi đầu lỏng hóa ban đầu giảm và sau đó tăng lên và lại giảm khi tăng tỷ lệ tro bay. Mô đun cắt của hỗn hợp cũng tuân theo một xu hướng tương tự. Việc thêm sợi polypropylene đã giúp trì hoãn việc khởi đầu lỏng hóa và đáng kể hoãn sự biến dạng của ma trận cát-tro bay.

Từ khóa

#lỏng hóa #tro bay #polypropylene #thử nghiệm triaxial #cát

Tài liệu tham khảo

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