摘要
随着沥青混凝土心墙堆石坝的快速发展,建设200m级超高沥青混凝土心墙堆石坝是未来的必然趋势,但目前既没有超高沥青混凝土心墙堆石坝的筑坝经验,也没有与之相适应的设计规范可供参考。首先基于朗肯土压力理论探讨超高沥青混凝土心墙堆石坝不同时期的受力可行性,细划心墙的受力状态,改进基于被动土压力理论求解心墙应力水平的算法;然后确定超高沥青混凝土心墙堆石坝的安全控制标准,据此推算适宜建设超高沥青混凝土心墙堆石坝的心墙和过渡料的合理材料参数取值范围;最后探索提高心墙安全性的工程措施。研究结果表明,建设200m级超高沥青混凝土心墙堆石坝是可行的,但需将心墙内摩擦角和黏聚力、过渡料内摩擦角控制在合理范围:φa≥30.5°,Ca≥0.25 MPa和φt≤43.5°,且随坝高的增长梯度按0.5%,1.5%和-0.5%/(25m)进行调整,即通过增大心墙内摩擦角和黏聚力、降低过渡料内摩擦角的工程措施,达到建设超高沥青混凝土心墙堆石坝的目的。旨在为将来建设200m级超高沥青混凝土心墙堆石坝提供借鉴作用。
With the rapid development of asphalt concrete core rockfill dams,the construction of 200 m ultra-high asphalt concrete core rockfill dams(UACCRDs)are inevitable in the future.However,there are neither experience for the construction of UACCRDs,nor corresponding design codes for reference.Based on the Rankine’s earth pressure theory,the mechanical feasibility of UACCRDs is analyzed at different periods.The stress states of asphalt concrete core(ACC)are divided detailedly and the algorithm that calculates the stress level of ACC is improved via the passive earth pressure theory.The safety control standard of UACCRDs is determined.And the reasonable material parameters of ACC and transition material for the suitable construction of UACCRDs are back calculated.Besides,the engineering measures that improve the safety of ACC are given.The results show that it is feasible to build 200-m UACCRDs.However,the internal friction angle and cohesion of ACC,and the internal friction angle of transition material are necessarily controlled within the reasonable range:φa≥30.5°,Ca≥0.25 MPa andφt≤43.5°,with the growth gradient adjusted by 0.5%,1.5%and-0.5%/(25 m).That is,the purpose that builds UACCRDs can be achieved by the engineering measures that increase the internal friction angle,cohesion of ACC and reduce the internal friction angle of transition material.The purpose of this paper is to provide a reference for the construction of 200 m UACCRDs.
作者
党发宁
高俊
任劼
方建银
薛海斌
DANG Faning;GAO Jun;REN Jie;FANG Jianyin;XUE Haibin(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an,Shaanxi 710048,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第S02期3690-3700,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51979225,51679199)
水利部公益性行业科研专项基金资助项目(201501034-04)。
关键词
水利工程
超高沥青混凝土心墙堆石坝
朗肯土压力理论
应力水平
材料参数
工程措施
hydraulic engineering
asphalt concrete core rockfill dam
Rankine’s earth pressure theory
stress level
material parameter
engineering measure
