新夏港双线船闸双排对拉板桩结构受力特性

为研究新夏港双线船闸闸室中隔墙双排对拉板桩结构的受力特性,利用ABAQUS有限元软件进行双闸室完整建模分析。采用修正剑桥模型模拟两侧闸室土体的同步开挖,对比分析施工期对拉板桩与单锚板桩的结构特性差异。运行期对双排板桩施加水压力,研究中隔墙整体变形特征、桩间土承载变形特性。结果表明:施工完建期,对拉板桩位移远小于单锚板桩,但两者变形相似,弯矩和土压力分布规律一致,且差值极小。运行期,宽矮的中隔墙在向低水侧闸室的侧向位移中,以剪切变形为主。板桩土压力增量与各自承受的净水压分布有关,还受上部连杆传力和低水侧横撑反力的影响。桩间土在传递、扩散侧向压力时,产生侧向压缩,并可分担中隔墙的大部分剪力。中隔墙弯矩主要由两道板桩分担。现有的双排板桩结构简化计算方法,尚无法反映桩间土抗剪的作用,值得进一步研究。

Mechanical behavior of counter-pulled sheet pile structure in Xinxia Port double-lane ship lock

In order to analyze the mechanical characteristics of counter-pulled sheet pile structure in Xinxia Port double-lane lock,we model the structure of the dual chamber ABAQUS finite element software.We simulate the double-track synchronous excavation with modified Cam-Clay model,compare and analyze the difference of the structural characteristics of counter-pulled sheet pile and single-anchor sheet pile during the construction period.During the operating period,we bring water pressure to bear on the double sheet pile,and study the global deformation characteristic of mid-partition wall and the bearing and deformation characteristics of earth among piles.The results show that the displacement of counter-pulled sheet pile is far less than that of single-anchor sheet pile,but the deformation of them are similar,and the regularities of distribution of bending moment and earth pressure are coincident with little difference.During the operating period,the main lateral displacement to low water side chamber of the wide and shallow mid-partition wall is shear deformation.The increment of earth pressure on piles is related to the distribution of net hydrostatic pressure on them,and also affected by the force passed by the upper connecting rod and the counter-force of the lateral brace in low water side.Lateral compression is produced when the earth among piles deliver and diffuse the lateral pressure,the earth among piles can share most responsibility for shear force.The bending moment of the earth among piles is mainly bear by the two piles.The existing simplified calculating method of the double sheet pile cannot yet reflect the shearing resistance of the earth among piles,and it is worth studying further.