水上栈桥和平台在人造覆盖层中的优化设计

Optimal Design of Temporary Water Bridge and Platform Located in Artificial Covering Layer

研究目的:通过分析人造覆盖层中入岩深度和不同边界条件下结构的整体稳定性,提供深水裸岩河床条件下人造覆盖层中水上栈桥和平台的优化设计方法,确保其安全性和可靠性。研究结论:(1)为减少爆破工作量,裸岩河床人造覆盖层中可以采用短桩形式,且短桩条件下采用"拉列琴假定"计算的入岩深度可以确保其安全性和可靠性;(2)因无法准确计算人造覆盖层对栈桥桩和平台桩的侧向抗力,桩的底部约束可按铰结和固结两种方式计算,实际情况介于这两者的计算结果之间;(3)若栈桥桩与平台桩在独立状态下不能满足安全性和可靠性,应增加二者之间的连接系,连接系的规格、数量和位置需通过整体强度及稳定性分析确定。

Research purposes： By analyzing the depth into the rock of artificial covering layer and the overall stability of structure under different boundary conditions, and providing an optimal design method that is used to temporary water bridge and platform in the condition of deepwater＇ s bare rock bed, their safety and reliability are ensured. Research conclusions： （1） To reduce the workload of blasting, the form of short piling can be used in the artificial covering layer at bare rock bed. The depth into rock, that is calculated by using ＂Lalyqin hypothesis＂ in the short piling condition, can make sure their safety and reliability; （2） Because inability to accurately calculate the artificial covering layer for bridge pile and piles of lateral resistance platform, two constraint ways of hinge end and consolidation at the bottom of pile can be used for calculation. The actual results are between their two results ; （3） If temporary bridge piles and platform piles can＇ t meet the safety and reliability requirements in an independent state, the connection between the two systems should be increased. The specifications, quantity and location of the connection system need to be analyzed by the overall analysis of system＇ s strength and stability.