爆炸与冲击2026，Vol.46Issue(4)：146-160,15.DOI:10.11883/bzycj-2024-0474
落石冲击下地面混凝土垫层对埋地管道的防护作用
Protective effect of ground concrete bedding layer on buried pipelines under rockfall impact
摘要
Abstract
To investigate the protective effect of ground concrete cushion layers on buried pipelines used for water transmission,field rockfall impact tests were conducted by pre-burying multi-section bell-and-spigot concrete pipelines and casting in-situ concrete cushions on the ground.Combined with the DH8302 dynamic strain testing system,the spatial distribution characteristics of dynamic strain in the pipeline body and the variation law of earth pressure at the bell-and-spigot joints were analyzed.The LS-DYNA numerical simulation software was used to establish a detailed model of the rockfall impact test,and the reliability of the numerical model was verified by comparing simulation results with test results.By increasing the impact energy of rockfalls,the failure characteristics of buried bell-and-spigot concrete pipelines were studied.The influence mechanism of concrete cushion parameters(thickness and strength)on the protective effect was further analyzed by varying these parameters.The results show that under the condition of a burial depth of 2 m,unstable crack propagation in the pipeline body is more likely to cause leakage of bell-and-spigot concrete pipelines under rockfall impact.The peak tensile strain in the pipeline body decreases nonlinearly with the increase of cushion thickness and strength.The cushion thickness must exceed a critical value(15 cm)to significantly dissipate energy,and there is an optimal strength range(C30-C35).Excessive strength enhancement will reduce protective efficiency.Cushion thickness accounts for 74%of the protective effect contribution,indicating that the design principle of"geometry prior to material"should be followed.It is recommended to use a concrete cushion with a strength of C30-C35 and a thickness large than 0.2 m,which can significantly reduce the risk of pipeline impact damage and provide a quantitative design basis for pipeline protection in mountainous areas.关键词
埋地混凝土管道/落石冲击/混凝土垫层/动力响应Key words
buried concrete pipeline/rockfall impact/concrete bedding/dynamic response分类
数理科学引用本文复制引用
刘天豪,蒋楠,周传波,姚颖康,杨锋,吕国鹏..落石冲击下地面混凝土垫层对埋地管道的防护作用[J].爆炸与冲击,2026,46(4):146-160,15.基金项目
湖北省自然科学基金杰出青年项目(2024AFA092) （2024AFA092）
国家自然科学基金资助项目(52578584、U25A20355、52478525) （52578584、U25A20355、52478525）
湖北省"智能建造"青年科技人才联合项目(2025DJA118) （2025DJA118）
