不同桩芯微型桩抗弯承载力试验研究  

Experimental Study on Flexural Capacity of Micro⁃piles with Different Pile Cores

作　　者：谢财进 饶军应[1] 刘灯凯 聂崇欣 XIE Caijin;RAO Junying;LIU Dengkai;NIE Chongxin(School of Civil Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025

出　　处：《防灾减灾工程学报》2021年第3期540-548,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51608141);贵州省科技计划项目(黔科合基础[2016]1041);土木工程一流学科项目(QYNYL[2017]0013)资助。

摘　　要：为研究不同桩芯微型桩在隧道洞口不良地质边坡中的治理效果,拟对钢筋‑混凝土、工字钢‑混凝土、钢管‑钢筋‑混凝土、钢管‑工字钢‑混凝土微型桩开展抗弯极限承载力试验。研究表明,工字钢‑混凝土微型桩相比钢筋‑混凝土微型桩极限抗弯承载力不仅大幅度提升,其抵抗位移变形的能力也有所增加。钢筋‑混凝土微型桩和工字钢‑混凝土微型桩桩径由140 mm变化到203 mm,韧性分别提高25%、50%,抗弯承载力分别提高89%、91%。钢管微型桩的韧度、极限抗弯承载力都明显强于裸露混凝土桩,即使变形已非常显著,仍能继续受力。钢管‑钢筋‑混凝土微型桩、钢管‑工字钢‑混凝土微型桩桩径由140 mm变化到203 mm,抗弯承载力分别提高近256%、265%。In order to study the treatment effect of micro-piles with different pile cores for stabilizing tunnel slopes in adverse geological conditions,a series of bending flexural tests have been conducted on micro-piles made of steel bar-concrete,steel I-beam-concrete,steel pipe-steel bar-concrete,steel pipe-steel I-beam-concrete,respectively.The test results show that both the ultimate flexural capacity and deformation resistance of the steel I-beam-concrete micro-pile are larger than those of the steel barconcrete micro-piles.When the diameters of the steel bar-concrete and the steel I-beam-concrete mi‑cro-piles increase from 140 mm to 203 mm,the toughness is increased by 25%and 50%,respective‑ly,and the flexural capacity is increased by 89%and 91%,respectively.The toughness and ultimate bending capacity of the steel pipe micro-pile are significantly greater than the bare concrete pile,and the loading capacity remains even when the deformation is very large.If the diameters of steel pipesteel bar-concrete and steel pipe-steel I-beam-concrete micro-piles increase from 140 mm to 203 mm,the flexural capacity increase by nearly 256%and 265%,respectively.

关 键 词：不同桩芯微型桩 抗弯极限承载力试验 隧道洞口边坡 治理效果 

分 类 号：TU758.11[建筑科学—建筑技术科学]