分离卸荷式板桩码头中地下连续墙的性状

Behaviors of underground diaphragm wall of sheet pile wharf with separated relieving platform

针对分离卸荷式板桩码头中地下连续墙内力和变形情况复杂且无完善的计算理论的现状,利用原型观测技术获取某港区10万t级分离卸荷式板桩码头在港池浚深期及码头运营1a期内的监测数据,探究新型板桩码头结构中地下连续墙在各种工况下的工作性状。基于原型观测数据,推算分析地下连续墙和遮帘桩的水平位移,拉杆拉力,地下连续墙海、陆侧土压力及地下连续墙海、陆侧竖向钢筋应力,混凝土应变和弯矩。结果表明:分离卸荷式承台和遮帘桩能够起到卸荷作用,减小地基土层对地下连续墙的侧向压力;地下连续墙内力和水平位移较小,码头实际运行状态良好;码头进入满载期的地下连续墙弯矩绝对值最大,最大正负弯矩分别为891kN.m和-693kN.m(弯矩以墙体海侧受拉为正)。

Because of the complexity of the internal force and deformation of the underground diaphragm wall of the sheet pile wharf with a separated relieving platform, there are no perfect computational theories. To solve this problem, prototype observation was conducted to obtain data on the 100 O00-ton class diaphragm sheet pile wharf in the stage of basin deepening during one year＇s of operation, and the properties of the underground diaphr^cn wall of the new sheet pile wharf in a variety of conditions were analyzed. Based on the prototype observation data, the horizontal displacement of the underground diaphragm wall and the pile, the tensile force of the pull rod, the lateral earth pressure of the underground diaphragm wall, reinforced stress, concrete strain, and the bending moment of the underground diaphragm wall were calculated. The results show that the separated relieving platform and the barrier piles could reduce the lateral earth pressure on the underground diaphragm wall, and the internal force and horizontal displacement of the underground diaphragm wall decreased, proving that the actual operation of the wharf was in good conditior~. During operation of the dock, the largest positive and negative bending moments were 891 kN·m and -693 kN·m, respectively （when the sea side of the wall was pulled, the bending moment was positive）.