丰宁抽水蓄能电站二期地下厂房施工期围岩变形规律分析  

Analysis on Deformation Law of Surrounding Rock During Construction of Underground Powerhouse of Fengning Pumped Storage Power Station PhaseⅡ

作　　者：王兰普 吕凤英 王波[2] 黄子康 WANG Lanpu;LV Fengying;WANG Bo;HUANG Zikang(Hebei Fengning Pumped Storage Co.Ltd.,Fengning 068350,China;School of Emergency Technology and Management,North China Institute of Science and Technology,Sanhe 101601,China)

机构地区：[1]河北丰宁抽水蓄能有限公司,河北省丰宁县068350 [2]华北科技学院应急技术与管理学院,河北省三河市101601

出　　处：《水电与抽水蓄能》2023年第2期106-114,共9页Hydropower and Pumped Storage

基　　金：国家自然科学基金(51404105);河北省自然科学基金(E2019508088);国网新源控股有限公司科技项目(SGXY-2020F09-2-37)。

摘　　要：丰宁抽水蓄能电站地下厂房具有规模大、结构复杂等特点,围岩稳定性控制难度大,做好围岩变形监测,则是保障地下厂房开挖过程中围岩稳定的重要措施。本文基于二期地下厂房开挖过程中的围岩变形监测数据,对围岩变形规律进行分析,得出以下结论:(1)顶拱洞室围岩变形主要变现为一期施工所引起的时效变形,但由于及时采取支护措施,并未对二期施工产生较大影响;(2)洞壁围岩相对于洞壁内部围岩变形较为明显,施工过程中应着重加强对洞壁围岩的监测与支护;(3)地下厂房出现围岩变形的原因是内部岩体性质、蚀变带发育、岩体结构面应力重分布、施工因素等多因素共同作用的结果,为确保地下厂房的正常运行,对变形较大区域进行长期监测并对及时采取支护措施尤为重要。以上结论为后期丰宁抽水蓄能电站地下厂房围岩支护提供了理论依据,同时也为类似大型抽水蓄能电站的施工及加固设计提供了借鉴。The underground powerhouse of Fengning Pumped Storage Power Station has the characteristics of large scale and complex structure.It is difficult to control the stability of surrounding rock.Monitoring the deformation of surrounding rock is an important measure to ensure the stability of surrounding rock during the excavation of underground powerhouse.Based on the monitoring data of the surrounding rock deformation during the excavation of the second-stage underground powerhouse,this paper analyzes the deformation law of the surrounding rock and draws the following conclusions:①The surrounding rock deformation of the vault cavern is mainly manifested as the timedependent deformation caused by the first-stage construction,but due to the timely adoption of supporting measures,it does not have a great impact on the second-stage construction;②The deformation of the surrounding rock of the tunnel wall is more obvious than that of the internal surrounding rock of the tunnel wall,and the monitoring and support of the surrounding rock of the tunnel wall should be strengthened in the construction process.③The reason of surrounding rock deformation of underground powerhouse is the result of multiple factors such as the nature of internal rock mass,the development of alteration zone,the stress redistribution of rock structural plane,and construction factors.In order to ensure the normal operation of underground powerhouse,it is necessary to monitor the large deformation area in time and take supporting measures.The above conclusions provide a theoretical basis for the surrounding rock support of underground powerhouse in Fengning Pumped Storage Power Station,and also provide a reference for the construction and reinforcement design of similar large pumped storage power stations.

关 键 词：地下洞室 变形监测 围岩变形 洞室支护 

分 类 号：TV52[水利工程—水利水电工程]