Hiệu Suất Thủy Lực của Các Đơn Vị Địa Kỹ Thuật Thông Thường và Hình Nón Lọc Hai Loại Đất Đường Cao Tốc

S. C. Ryoo1, A. H. Aydilek1
1Department of Civil and Environmental Engineering, University of Maryland, College Park, USA

Tóm tắt

Hơn 1/3 các trường hợp thất bại của tường chắn đường cao tốc trên toàn thế giới xảy ra do thiếu hoặc hệ thống thoát nước không đầy đủ. Một nghiên cứu đã được tiến hành để xác định hiệu suất của hệ thống giảm áp lực lỗ chân lhon mới phát triển thông qua việc sử dụng các đơn vị địa kỹ thuật hình nón lọc đất đắp tường chắn được sử dụng trong môi trường đường cao tốc. Một mô hình số dựa trên hệ phương trình động lực học chất lỏng tính toán và phương pháp phần tử rời rạc (CFD-DEM) đã được phát triển để mô phỏng chuyển động của hạt trong đất và sự chảy qua các địa kỹ thuật. Mô hình này được sử dụng cho cả hệ thống lọc địa kỹ thuật thông thường và địa kỹ thuật hình nón sử dụng các loại địa kỹ thuật dệt và không dệt để lọc đất đắp marginal với hàm lượng bột cao và vật liệu đắp sỏi thông thường. Cả vùng tiếp xúc giữa đất và địa kỹ thuật cũng như độ thấm của hệ thống đều bị ảnh hưởng bởi sự thay đổi hàm lượng bột trong vật liệu đắp. Việc sử dụng bộ lọc hình nón đã làm tăng độ thấm của hệ thống lên đến 2,6 lần, trong khi tỷ lệ chảy tăng gần 10 lần do việc sử dụng bộ lọc hình nón. Tỷ lệ giữ lại đã thành công trong việc dự đoán tỷ lệ chảy cho các loại địa kỹ thuật dệt và không dệt khác nhau với độ sai lệch phần trăm từ 13–30%, và đã được sử dụng để phát triển các biểu đồ hiệu suất đơn giản. Các biểu đồ đã phát triển này có thể hữu ích cho các chuyên gia thực hành, và phương pháp phát triển có thể được áp dụng để mở rộng các giải pháp biểu đồ này cho các loại đất và địa kỹ thuật khác.

Từ khóa

#tường chắn #địa kỹ thuật #hệ thống thoát nước #hiệu suất thủy lực #mô hình số

Tài liệu tham khảo

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