超深防渗墙连接槽段接头管拔管技术数值模拟研究

Numerical simulation based study on pulling-out of joint-pipe for construction of joint section of super-deep cut-off wall

以西藏旁多水电站大坝防渗墙施工为依托,研究了超深防渗墙施工中槽段连接的难点和关键点,合理确定了接头管的起拔时间、起拔力等参数。在混凝土"稳固"特性基础上,采取数值模拟技术研究了接头管的最佳拔管时机,确定了不同条件下的拔管力,以便为工程设计与施工提供相关技术依据。

Based on the construction of the cut-off wall in the dam of Pangduo Hydropower Station in Tibet, the difficulties and key points from the construction of the joint section of the super-deep cut-off wall are studied herein; in which the parameters such as the pulling time, pulling force for pulling out of the joint-pipe, etc. are reasonably determined. In accordance with the stabilized characteristics of concrete, the optimum time for pulling-out of the joint-pipe is studied based on a numerical simulation, and then the relevant pulling forces under various conditions are determined as well, so as to provide the related technical basis for both the design and construction of the project concerned.