NGHIÊN CỨU XÁC ĐỊNH GÓC MA SÁT TIẾP XÚC MÓNG ĐẬP XÀ LAN TRÊN NỀN ĐẤT YẾU CHỊU TẢI TRỌNG PHỨC HỢP ĐỨNG, NGANG VÀ MÔ MEN

Abstract

A movable dam based on an extended width principle helps to reduce the stress of the foundation so that it can be directly constructed on a soft soil foundation without treatment requirement. Vertical loads acting on the foundation of the movable dam are low but horizontal loads and moments are larger because of the large difference between the water levels in up- and down-stream of the dam. Thus, the stability of the movable dam constructed on the soft soil requires detailed studies. This paper presents a study on the soil-concrete friction angle of a foundation on the soft soil as a basis to clarify the interacting mechanism and elements addressed in Ngo Tran (1996) in order to prove the suitable application on clay. Determining the interface friction angle is very essential to construct the dimensionless failure surface of the movable dam. The authors have performed a sliding experiment for a pressed concrete slab of 0.2 x 0.3 x 0.4 m; each experiment is performed with three vertical loading scales and slid until instability. The sliding experiment results to define the soil-concrete friction angle are important inputs for studying on the failure surface of the movable dam.