纤维增强柔性混凝土压气储能地下洞室力学响应研究  

Mechanical response of fiber reinforced flexible concrete for compressed air energy storage underground caverns

作　　者：鲁青云 徐英俊 夏才初 刘少华 LU Qing-yun;XU Ying-jun;XIA Cai-chu;LIU Shao-hua(Institute of Rock Mechanics,Ningbo University,Ningbo,Zhejiang 315211,China;Ningbo Key Laboratory of Energy Geostructure,Ningbo University,Ningbo,Zhejiang 315211,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]宁波大学岩石力学研究所,浙江宁波315211 [2]宁波大学宁波市能源地下结构重点实验室,宁波浙江315211 [3]同济大学土木工程学院,上海200092

出　　处：《岩土力学》2024年第12期3566-3575,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.U23B20145,No.52278402);国家重点研发计划政府间重点专项(No.2024YFE0105800);宁波大学研究生科研创新项目(No.IF2024039)。

摘　　要：高内压作用下压气储能地下洞室极易开裂,严重威胁洞室稳定性和密封性。为充分传递内压荷载、增强洞室变形能力,发挥围岩的承载能力,提出了柔性衬砌的设计理念:采用低弹性模量的柔性混凝土作为压气储能地下洞室衬砌层。通过室内试验研究了不同配比下柔性混凝土的力学性能,据此提出了柔性混凝土的修正损伤-塑性本构关系模型(concrete damaged plasticity,CDP),并建立了柔性混凝土的压气储能地下洞室力学计算模型。为论证柔性混凝土用于压气储能地下洞室的可行性,以某在建的压气储能地下洞室工程为背景,比较了采用不同衬砌形式以及不同柔性混凝土配比对压气储能地下洞室力学响应规律的影响,结果表明:采用低弹性模量的柔性混凝土可以有效地降低在高内压压气储能地下洞室混凝土衬砌的拉应力,减少衬砌开裂,充分实现了传递内压荷载、增强洞室变形能力,发挥围岩承载能力的作用。High internal pressure can readily cause cracking in the underground cavern of compressed air energy storage(CAES),posing a significant threat to its stability and sealing.To effectively transfer internal pressure loads,enhance cavern deformation capacity,and leverage the bearing capacity of surrounding rock,we propose a flexible lining design using low-elastic modulus flexible concrete as the lining layer for CAES underground caverns.The mechanical properties of flexible concrete under various proportions are initially investigated through laboratory tests.Building on these findings,we propose a modified concrete damage-plasticity(CDP)constitutive model for flexible concrete and establish a mechanical calculation model for underground caverns utilizing flexible concrete.To demonstrate the feasibility of using flexible concrete in CAES underground caverns,this study compares the mechanical response of these caverns with different lining forms and varying flexible concrete ratios.This comparison is conducted within the context of an ongoing CAES underground cavern project.The results indicate that low-elastic modulus flexible concrete can effectively reduce tensile stress in the concrete lining of high-pressure CAES underground caverns.This stress reduction minimizes lining cracking,facilitates internal pressure load transfer,enhances cavern deformation capacity,and leverages the bearing capacity of surrounding rock.

关 键 词：压气储能 柔性混凝土 地下洞室 稳定性 

分 类 号：TU93[建筑科学—结构工程]