西藏某水电站导流隧洞塌方过程与稳定性分析  

Collapse Process and Stability Analysis of Diversion Tunnel of a Hydropower Station in Xizang

作　　者：秦波 戴宇辰 范洋辉 QIN Bo;DAI Yuchen;FAN Yanghui(Huadong Engineering(Fujian)Corporation Limited,Fuzhou 350003,China;Power China Huadong Engineering Corporation,Hangzhou 311122,China)

机构地区：[1]华东勘测设计院(福建)有限公司,福建福州350003 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《河南科技》2024年第21期49-52,共4页Henan Science and Technology

摘　　要：【目的】为了确定水电站导流隧洞塌方段的安全性,需要对塌方段施工期、运行期的稳定性及相应处理措施进行研究。【方法】以西藏某水电站为典型案例,结合其导流隧洞塌方过程进行分析,通过计算最小岩体覆盖厚度、相邻隧洞最小围岩厚度和衬砌结构配筋等3个指标来分析隧洞塌方段运行期的稳定性。【结果】计算得出,1号导流隧洞塌方段岩体实际厚度大于理论最小围岩覆盖厚度,相邻隧洞最小围岩厚度大于2倍开挖洞径(洞宽),实际配筋面积大于理论配筋面积。【结论】在水电站导流隧洞设计施工过程中,通过3个指标的计算分析表明该隧洞满足施工期和运行期的稳定性要求。[Purposes]In order to investigate the safety of the collapsed section of hydropower station diversion tunnels,it is necessary to study the stability of the collapsed section during the construction and operation periods and the corresponding treatment measures.[Methods]Taking a hydropower station in Xizang as a typical case and analyzing the collapse process of its diversion tunnel,the stability of the collapsed section of the tunnel during the operation period was analyzed by calculating the three indexes of minimum rock cover thickness,minimum surrounding rock thickness of adjacent tunnels,and reinforcement of the lining structure.[Findings]Calculations show that the actual thickness of the rock body in the collapsed section of No.1 diversion tunnel is greater than the theoretical minimum perimeter rock cover thickness,the minimum perimeter rock thickness of the neighboring tunnels is greater than two times the excavation diameter(hole width),and the actual reinforcing area is greater than the theoretical reinforcing area.[Conclusions]In the process of designing and constructing the diversion tunnel of the hydropower station,the calculation and analysis of three indicators show that the tunnel meets the stability requirements during the construction and operation periods.

关 键 词：导流隧洞 隧洞塌方 稳定性分析 围岩厚度 衬砌配筋 

分 类 号：TV223.4[水利工程—水工结构工程] TV672.1