锚碇沉箱基础与升浆基床摩擦性能研究

针对国内首个采用沉箱基础的海上悬索桥,主要对水下预填骨料抛石升浆基床与混凝土之间的摩擦性能,以及碎石基床与混凝土结构的摩擦因数展开研究.首先通过室内和现场实验得到碎石基床与混凝土结构的摩擦因数,在此基础上采用数值分析方法得到水下预填骨料抛石升浆基床与混凝土结构之间的摩擦性能.结果表明,普通碎石基床与混凝土沉箱之间的摩擦因数在设计规范规定的0.5~0.6内,而预填骨料抛石升浆基床与混凝土沉箱之间的摩擦因数为0.7~0.8,如考虑混凝土之间的黏结力膜作用,摩擦因数可达0.9.

Research on friction property between anchorage caisson foundation and grouting bed

According to the first domestic offshore suspension bridge using caisson foundation, the friction property between prepacked aggregate riprap grouting bed and concrete under water, the friction coefficients between gravel bed and concrete structure are mainly studied. Firstly, the friction coefficients between gravel bed and concrete structure are obtained by laboratory and field experiments, and then, the friction property between prepacked aggregate riprap grouting bed and concrete structure under water is acquired by the numerical analysis method. The experimental results show that the friction coefficients between the common gravel bed and the concrete caisson are in the range of 0.5-0.6, which meets the corresponding code, and the friction coefficient between the prepacked aggregate riprap grouting bed and the concrete caisson is within 0.7-0.8, or even 0.9 considering the film cohesive force of concrete.