板桩加固护岸受力机制的现场试验研究

结合长湖申航道湖州段板桩加固护岸实体工程，在板桩预制过程中将土压力计埋入板桩侧面，底板施工时将土压力计埋入底板下，测试了在板桩混凝土凝固硬化过程中土压力计的受力情况、护岸荷载下板桩桩身两侧土压力的分布规律及护岸底板下土压力分布规律。试验结果表明，混凝土凝固硬化过程对埋入板桩两侧的土压力计会产生较大拉压应力并逐步趋于稳定，板桩两侧土压力及底板下土压力受施工荷载的影响在沉桩及底板施工初期存在较大调整并逐步趋于稳定；板桩靠岸侧和临水侧土压力分布存在明显差别，靠岸侧主动土压力分布呈现先增大后减小、然后增大的非线性分布规律，临水侧被动土压力基本呈线性分布。《板桩码头设计与施工规范》1]中推荐的土压力计算方法计算靠岸侧主动土压力和临水侧被动土压力标准值均较实测值小，基本呈现随着深度的增加差别逐渐增大的规律；在护岸荷载作用下底板下土压力呈现两端大中间小的抛物线分布规律。

Field experimental study of stress mechanism of sheet pile reinforced revetment

Based on the revetment reinforcement project at Huzhou section of Chang-Hu-Shen Waterway using sheet piles,soil pressure cells were buried on both sides of sheet pile during the precast period and at the bottom floor of revetment during constructing revetment.The pressure variation of earth pressure cell in the course of concrete setting and hardening,the rule of earth pressure distribution at both sides of sheet piles and the bottom floor of revetment were tested and analyzed.The results show that the cour...