地下洞室施工期顶拱变形破坏机理及处置对策研究  

Mechanism of Deformation and Damage of Top Arch During Underground Cavern Construction and Disposal Countermeasures

作　　者：任韬哲 吕风英 何军 张雨霆[2] REN Tao-zhe;LV Feng-ying;HE Jun;ZHANG Yu-ting(Pumped-Storage Technological&Economic Research Institute,State Grid Xinyuan Company Ltd.,Beijing 100761,China;Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]国网新源控股有限公司抽水蓄能技术经济研究院,北京100761 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《水电能源科学》2024年第12期139-142,170,共5页Water Resources and Power

基　　金：国网新源集团(控股)有限公司科技项目(SGXYKJ-2023-057);国家自然科学基金项目(U2340229);北京江河水利发展基金会水利青年科技英才项目(JHYC202305);中国博士后科学基金面上项目(2023M730367)。

摘　　要：喷混凝土层是地下厂房洞室群中普遍采用的一种防护结构。喷层材料开裂、空鼓、掉块等现象,不仅影响地下厂房洞室群的施工安全,也使原支护体系受损,给地下厂房洞室群的稳定性带来不确定性。以抽水蓄能电站大型地下洞室群为例,首先分析了主厂房顶拱围岩的变形破坏特征;其次,分别从洞室围岩变形特点、混凝土强度及其粘结性能进行分析,明确了顶拱变形破坏的主要原因,并揭示了顶拱破坏区域和围岩显著变形区域的关联性;然后,将顶拱变形破坏机理划分为结构面变形引起的喷层剪切破坏和岩体蚀变引起的喷层弯折破坏两类;最后,提出了顶拱变形破坏工程问题的处置对策,为类似工程问题的解决提供了参考。Sprayed concrete layer is a kind of protective structure commonly used in underground plant cavern group.The phenomena such as cracking,hollowing and falling of sprayed layer materials not only affect the construction safety of underground plant cavern group,but also damage the original support system and bring uncertainty to the stability of underground plant cavern group.Taking the large underground cavern group of pumped storage power station as an ex-ample,the deformation and damage characteristics of the top arch surrounding rock of the main plant were analyzed.The deformation characteristics of the surrounding rock of the cavern chamber and the strength of concrete and its bonding properties were analyzed respectively to clarify the main reasons for the deformation and damage of the top arch and reveal the correlation between the top arch damage area and the peripheral rock significant deformation area.Then,the top arch deformation damage mechanism was divided into two categories:shear damage of spray layer caused by deformation of structural surface and bending damage of spray layer caused by rock erosion.Finally,the disposal countermeasures of top arch deformation damage engineering problems were proposed,which provide reference for the solution of similar engi-neering problems.

关 键 词：地下洞室 顶拱 喷混凝土 开裂 破坏机理 

分 类 号：TV731.6[水利工程—水利水电工程]