安徽省石台抽水蓄能电站高压隧洞衬砌型式分析与评价

Analysis and evaluation of high pressure tunnel lining types in Shitai Pumped Storage Power Station in Anhui Province

为了准确选定安徽省石台抽水蓄能电站高压隧洞的衬砌型式,通过分析场区的工程地质条件,结合现场试验以及三维应力场回归分析结果,采用“三大准则”与外水压力对高压隧洞进行评价。结果表明:石台高压隧洞满足挪威准则与最小主应力准则,但围岩初始劈裂压力在引水隧洞上竖井下弯段以下局部洞段小于洞内静水压力,存在渗透变形破坏风险。提出在上竖井下弯段首部以下洞段采用钢板衬砌的地质建议。研究结果对确保引水隧洞围岩渗透稳定的前提下优化工程投资具有参考价值。

To accurately select the lining type of high-pressure tunnel of Shitai Pumped Storage Power Station in Anhui Province,the"Three Criteria"and external water pressure measures were used to evaluate the high-pressure tunnel by analyzing the engineering geological conditions of the site,combining with on-site tests and three-dimensional stress field regression analysis results.The results showed that the Shitai high-pressure tunnel met the Norwegian criteria and minimum principal stress criteria,but the initial splitting pressure of the surrounding rock was lower than the hydrostatic pressure in the local section below the lower bend of the upper vertical shaft of the headrace tunnel,posing a risk of seepage deformation and failure.The geological suggestion was proposed to use steel plate lining for the tunnel section below the head of the upper vertical shaft and lower bending section.The research results can provide a reference for optimizing engineering investment while ensuring the stability of surrounding rock permeability in the diversion tunnel.