高岩温发电引水隧洞支护结构全过程温度场分析

Analysis of whole process temperature distribution of supporting structures in diversion tunnel with high rock temperature power

针对我国西北地区出现的高岩温引水发电隧洞,以布伦口—公格尔水电站的高岩温引水发电隧洞为背景,基于施工过程仿真,以110℃,90℃和60℃的初始岩温、5℃和10℃运行水温对引水发电隧洞全过程温度场分布规律的影响进行研究,揭示围岩不同初始温度场和设计运行水温对高岩温引水隧洞全过程温度场分布影响规律。结果表明初始岩温越高,支护结构内外温差越大;受运行低水温冲击作用,运行初期支护结构1d内出现了高速率的降温,严重影响支护结构安全性;设计运行水温对支护结构温度场分布有一定影响。

Exemplified with the diversion tunnel with high rock temperature power at Bulunkou\|Gonggeer Hydropower Station,we studied the division tunnel with high rock temperature power occurring at northwestern part of China.Based on the construction simulation,the whole process temperature distribution of different rock temperature with 110℃,90℃and 60℃,and the different operation water temperature with 5℃and 10℃are presented in the paper,and the regulation of temperature distribution is revealed.It is indicated that the temperature difference of supporting structures was higher with the rise of rock temperature;that high rate cooling appeared during the first day in initial operation,and the safety of supporting structures would be seriously affected;and that the designed operation water temperature would exert some influence on the temperature distribution of the supporting structures.