Phân tích quá trình biến dạng của mô hình dốc đất trong quá trình thấm nước sử dụng BOTDA

Bulletin of Engineering Geology and the Environment - Tập 76 - Trang 947-959 - 2016
Jun-fan Yan1, Bin Shi1, Farhad Ansari2, Hong-hu Zhu1, Zhan-pu Song1, Ebrahim Nazarian2
1School of Earth Sciences and Engineering, Nanjing University, Nanjing, China
2Department of Civil and Material Engineering, University of Illinois at Chicago, Chicago, USA

Tóm tắt

Thấm nước mưa có thể là nguyên nhân chính dẫn đến sự cố trượt đất. Trong bài báo này, một mô hình dốc đất trong nhà đã được xây dựng; một sợi cảm biến phân tán được thiết kế dựa trên phân tích thời gian quang học Brillouin (BOTDA). Hai đầu dò độ ẩm đất đã được cắm vào và một thử nghiệm thấm nước mưa đã được mô phỏng để thu thập dữ liệu về quá trình thấm và biến dạng của dốc đất dưới tác động của nước mưa. Hàm lượng nước thể tích theo miền thời gian của dốc được theo dõi cùng với sự thay đổi biến dạng theo phương thẳng đứng và ngang. Kết quả đo độ ẩm cho thấy đường đi của nước thấm và có sự gia tăng rõ rệt tại bề mặt trượt của dốc. Kết quả từ sợi quang cho thấy có sự tập trung biến dạng rõ ràng gần khu vực cắt trượt của dốc và vùng chuyển tiếp biến dạng; quy luật biến dạng đất có mối quan hệ không gian gần gũi với đường thấm nước trong đất. Ngoài việc xác định chính xác bề mặt trượt, một bề mặt cắt thứ cấp cũng đã được phát hiện bởi hệ thống BOTDA. Những kết quả này cung cấp thông tin quý giá liên quan đến cơ chế trượt và dự đoán sự cố trượt đất.

Từ khóa

#thấm nước #biến dạng đất #dốc đất #Brillouin #BOTDA #mô hình thí nghiệm #cơ chế trượt

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