CFRP补强水工压力隧洞内压分载比例参数敏感性分析  

Parameter Sensitivity Analysis for Bearing Ratio of Internal Water Pressure in Hydraulic Pressure Tunnel Strengthened with CFRP

作　　者：秦敢 陈锐 金典琦 曹生荣[3] 杨帆 QIN Gan;CHEN Rui;JIN Dian-qi;CAO Sheng-rong;YANG Fan(School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;Shenzhen Urban Public Safety and Technology Institute,Shenzhen 518000,China;School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]哈尔滨工业大学(深圳)土木与环境工程学院,广东深圳518055 [2]深圳市城市公共安全技术研究院有限公司,广东深圳518000 [3]武汉大学水利水电学院,武汉430072

出　　处：《长江科学院院报》2023年第3期151-157,165,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发计划项目(2019YFC0810702);中央高校基本科研业务费专项(JZ2020HGQA0141)。

摘　　要：采用CFRP加固水工压力隧洞时,CFRP除了要承担变化的外部水土荷载,还要承担部分内水压力。为了明确“CFRP-胶层-衬砌混凝土”复合结构的内压分载规律,建立了“实体-弹簧-实体”三维有限元模型,并结合模型试验的实测结果验证了有限元模型的有效性。基于该模型,分析了胶层的弹性模量(E_(a))、胶层的厚度(t_(a))、CFRP的弹性模量(E_(c))和CFRP的厚度(t_(c))等参数变化时,衬砌混凝土和CFRP之间承担内水压力比例的变化规律。计算分析结果表明:t_(c)和E_(c)是影响衬砌混凝土承担内水压力比例的主要因素。对于粘贴1~3层的计算工况,当t_(c)由0.1 mm逐渐增加到2 mm的过程中,衬砌混凝土承担内水压力的比例分别减小了34.25%、47.776%、53.931%;当E_(c)由100 GPa增加到600 GPa的过程中,衬砌混凝土的承载比例分别减小了6.482%、11.945%、16.509%。极差分析结果也表明,衬砌混凝土承担内水压力的比例对上述4个参数的敏感性由高到低依次为t_(c)>E_(c)>E_(a)>t_(a)。因此,若要降低衬砌混凝土承担内水压力的比例并提高CFRP材料的利用率,提高所选用的CFRP的厚度与弹性模量是关键。Carbon Fibre Reinforced Polymer(CFRP)bears not only the varying external soil and water loads,but also part of the internal water pressure when used in strengthening pressure tunnels.To investigate the joint bearing mechanism of the composite structure containing CFRP,adhesive lining,and concrete under internal water pressure,we established a“solid-spring-solid”3D finite element model of pressurized water conveyance tunnel strengthened with CFRP,and verified the validity of the model via model test.By using this model,we examined the ratio of bearing internal water pressure between lining concrete and CFRP under varying conditions including elastic modulus of adhesive layer(E_(a)),thickness of adhesive layer(t_(a)),elastic modulus of CFRP(E_(c)),and thickness of CFRP(t_(c)).Results reveal that t_(c)and E_(c)are dominant factors that affect the bearing ratio.In the presence of 1-3 layers of CFRP,with t_(c)gradually increasing from 0.1 mm to 2 mm,the percentage of internal water pressure borne by lining concrete declined by 34.25%,47.776%,and 53.931%,respectively;when E_(c)grew from 100 GPa to 600 GPa,that percentage dropped by 6.482%,11.945%,and 16.509%,respectively.Range analysis also manifest that the percentage of internal water pressure borne by lining concrete is most sensitive to t_(c),followed by E_(c),E_(a),and t_(a)in descending order.In conclusion,improving the thickness and modulus of CFRP is the key to enhancing the utilization of CFRP and to reducing the percentage of internal water pressure borne by lining concrete.

关 键 词：压力隧洞 CFRP加固隧洞 复合结构 内压分载比例 参数分析 

分 类 号：TV332[水利工程—水工结构工程]