Bài viết phân tích và thiết kế cầu tiếp cận kè bằng cách sử dụng EPS Geofoam, được áp dụng trên nền đất yếu mà không cần phải xử lý nền đất yếu bên dưới. Kết quả cho thấy: Các tấm đệm EPS Geofoams sản xuất tại Việt Nam với tỷ trọng 20 ± 1 kg/m3 có thể ứng dụng để thi công cầu tiếp cận kè trên nền đất yếu; Nền đường trong các giai đoạn xây dựng và sử dụng đảm bảo yêu cầu về khả năng chịu lực theo tiêu chuẩn Việt Nam. Mời các bạn cùng tham khảo! | NGHIÊN CỨU GIẢI PHÁP XÂY DỰNG ĐƯỜNG VÀO CẦU BẰNG VẬT LIỆU NHẸ GEOFOAM TRÊN ĐẤT YẾU P AN P ƢỚC V N TRẦN NGUYỄN OÀNG NG Investigation of light weight Geofoam to construct bridge approaching embankments on soft ground Abstract Most of bridge abutments in Vietnam have been applied on soft ground especially in the Southern Vietnam. After bridge abutments were used almost all constructions have occurred differential settlement of bridge abutments which has caused difficultly for traveling of vehicles and reduced the traffic capacity on the route. Some current solutions to treat differential settlement of bridge abutments are often costly and time- consuming. EPS Geofoam lightweight materials were used to apply for highway embankments in developed countries such as the USA Japan and European countries. However EPS Geofoam has little known as construction materials for transportation structures in Vietnam. This paper attempts to analysis and design bridge approaching embankment by using EPS Geofoam which is applied on soft ground without having to treat the soft ground below. The results show that 1 EPS Geofoams made in Vietnam with density 20 1 kg m3 can be applied to construct bridge approaching embankments on soft ground 2 The road foundation in construction and used stages ensures bearing capacity requirements according to Vietnam standard 3 The load applied to EPS Geofoam is less than its compressive strength with safety factor FS 7 Bridge abutment ensures the instant settlement when there are dynamic loads and settlement caused by primary consolidation ensures the requires according to Vietnam standard 5 The slope stability was ensured with FS 1 4 6 The buoyancy stability was ensured with FS 1 2. Keywords EPS Geofoam lightweight material bridge abutment bridge approaching embankment Soft ground improvement. 1. G Ớ T ỆU biệt rút ngắn thời gian thi công. Geofoam đƣợc Vật liệu nhẹ EPS Geofoam có nhiều tiềm sản xuất và cung cấp từ các nhà sản xuất mút năng để ứng .
