Kháng cự lỏng hóa tuần hoàn của cát được xử lý bằng MICP và EICP trong điều kiện cắt đơn giản: so sánh với trạng thái phê phán của cát chưa xử lý

Acta Geotechnica
Isaac Ahenkorah1, M.F. Rahman2, Md. Rajibul Karim2, Simon Beecham2
1Department of Geotechnical Engineering, Rio Tinto Iron Ore, WA, 6751, Australia
2UniSA STEM, University of South Australia, Mawson Lakes, SA, 5000, Australia

Tóm tắt

Tóm tắt

Trong nghiên cứu này, hành vi tuần hoàn không thoát nước của cát được xử lý sinh học bằng phương pháp kết tủa carbonat dẫn xuất từ vi sinh vật và enzyme được nghiên cứu cho một loạt các tỷ lệ rỗng ban đầu sau khi kết nén ($$e_{0}$$ e 0 ), ứng suất bình thường hiệu quả ban đầu ($$\sigma^{\prime }_{{{\text{N}}_{0} }}$$ σ N 0 ′ ) và hàm lượng cacbonat canxi (CC) trong điều kiện thử nghiệm cắt đơn giản trực tiếp (DSS). Khung cơ học đất trạng thái phê phán cho cát chưa xử lý được thiết lập lần đầu tiên bằng cách sử dụng một loạt các thử nghiệm thoát nước và không thoát nước (khối lượng không đổi), tạo thành một mốc để đánh giá hành vi lỏng hóa tuần hoàn không thoát nước của cát chưa xử lý và cát được xử lý sinh học. Kết quả chỉ ra rằng tham số trạng thái ban đầu đã được điều chỉnh ($$\psi_{{{\text{m}}_{{0}} }}$$ ψ m 0 ) trong điều kiện DSS cho thấy có mối tương quan tốt với các trạng thái không ổn định và chuyển biến pha dưới tác động của cắt đơn điệu. Trong điều kiện tải trọng DSS tuần hoàn không thoát nước, các mẫu hiển thị tính di động tuần hoàn được chỉ ra bởi sự tích lũy đột ngột của biến dạng lớn hoặc $$\sigma^{\prime }_{{N_{0} }}$$ σ N 0 ′ tạm thời đạt đến không hoặc sự tích lũy đột ngột của áp lực nước lỗ rỗng dư thừa. Mối liên kết giữa lỏng hóa tĩnh và tuần hoàn đã được thiết lập cho các vật mẫu cát chưa xử lý và được xử lý sinh học dựa trên sự tương đương của các trạng thái đất đặc trưng. Số chu kỳ trước khi lỏng hóa (NL) cho các mẫu cát được xử lý sinh học chủ yếu được kiểm soát bởi tỷ lệ ứng suất tuần hoàn, $$e_{0}$$ e 0 , $$\sigma^{\prime }_{{{\text{N}}_{{0}} }}$$ σ N 0 ′ và CC. Đối với một trạng thái ban đầu tương tự trước khi tải trọng tuần hoàn không thoát nước, các mẫu được xử lý sinh học yêu cầu một NL lớn hơn so với cát chưa xử lý. Tỷ lệ kháng cự tuần hoàn tại NL = 15 (CRR15) tăng lên khi giảm $$\psi_{{{\text{m}}_{{0}} }}$$ ψ m 0 đối với cát chưa xử lý, trong khi CRR15 của cát được xử lý sinh học tăng lên cùng với việc tăng CC và giảm $$\sigma^{\prime }_{{N_{0} }}$$ σ N 0 ′ .

Từ khóa


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