摘要
为了更合理地评价地震作用下热锚管框架支护多年冻土边坡的稳定性,基于波动理论和极限分析上限定理,并结合似黏聚力理论和冻土边坡失稳破坏模式,推导了地震波在冻融双层介质交界面处的波形转换和透射反射系数,给出了P波或SV波作用下的热锚管框架冻土边坡体系地震动力稳定性计算方法,并结合算例进行了分析与验证。结果表明:新型热锚管支护技术与热棒、锚杆相比其可靠性更好,能够从热学和力学2个方面共同提高冻土边坡的稳定性,其换热能力越强、极限锚固力越大,冻土边坡稳定性也就越高;入射地震波强度增加,热锚管冻土边坡体系的稳定性降低,且提出的地震稳定性分析方法与动力强度折减法和传统拟静力法结果总体趋势较为一致。研究结果可为热锚管框架支护冻土边坡的抗震设计提供科学合理的依据。
To more reasonably evaluate the stability of permafrost slopes supported by thermal anchor pipe frames under seismic action,the waveform conversion and transmission reflection coefficient of seismic waves at the freeze-thaw double-layer media interface were derived.The calculation was based on wave theory and the upper limit theorem of limit analysis and combined with the theory of quasi cohesion and failure mode of permafrost slopes.A method for calculating the seismic dynamic stability of thermal anchor pipe frame permafrost slope systems under the action of P-or SV-waves was proposed.Analysis and verification were conducted based on numerical examples.The results show that the new thermal anchor pipe support technology has better reliability than heat pipes and anchor rods and improves the stability of permafrost slopes against both thermal and mechanical aspects.Furthermore,the stronger the heat transfer capacity and greater the ultimate anchoring force,the higher the permafrost slope stability.An increase in incident seismic wave intensity leads to a decrease in the stability of the thermal anchor pipe frozen soil slope system.Moreover,the results of the proposed seismic stability analysis method are generally consistent with those of the dynamic strength reduction and traditional quasi-static methods.The results provide a scientific and reasonable basis for the seismic design of thermal anchor pipe frame supports for permafrost slopes.
作者
吴晓磊
董建华
王璐
杨博
杨晓宇
杨伟乐
WU Xiao-lei;DONG Jian-hua;WANG Lu;YANG Bo;YANG Xiao-yu;YANG Wei-le(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;CCCC First Highway Fifth Engineering Co.Ltd.,Beijing 100024,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2023年第10期106-118,共13页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51778275,52178335)
中央引导地方科技发展资金项目(YDZX20216200001739)
水利部重大科技项目(SKS-2022166)
陇原青年创新创业人才(团队)项目(2020RCXM120)
兰州市十大科技创新项目(2020-2-11)
甘肃省知识产权局高价值专利培育和转化项目(20ZSCQ034)。
关键词
路基工程
地震作用
热锚管框架结构
冻土边坡
波动理论
动力稳定性
subgrade engineering
seismic action
thermal anchor pipe frame structure
permafrost slopes
wave theory
dynamic stability
