轮胎加筋砂垫层抗液化性能振动台试验研究  

Shaking table tests on the liquefaction resistance of tire-reinforced sand cushions

作　　者：李博文 鲁洋[1] 刘斯宏[1] 沈超敏[1] 方斌昕 LI Bowen;LU Yang;LIU Sihong;SHEN Chaomin;FANG Binxin(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,Jiangsu,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《地震工程学报》2024年第2期369-375,共7页China Earthquake Engineering Journal

基　　金：国家重点研发计划(2017YFE0128900);国家自然科学基金(52109123);中国博士后科学基金(2021M690878)。

摘　　要：将废弃橡胶轮胎内填充散体材料形成加筋土结构,已被应用于地基、挡土墙和边坡加固等工程,表现出较好的减震隔振效果,而轮胎加筋土的抗液化性能尚缺乏研究。开展3组小型振动台试验,通过改变轮胎垫层的排水条件,验证轮胎加筋砂垫层的抗液化效果。结果表明:轮胎加筋砂垫层具有良好的抗液化效果,与刚性垫层相比,超静孔压比峰值差值范围在0.01~0.19,残余超静孔压比差值范围在0.08~0.16,轮胎加筋砂垫层提供的排水通道具有抑制超静孔隙水压力发展和加速超静孔隙水消散的作用,孔隙水会沿着轮胎与下部土体的界面以及胎间的排水通道排出;采用量测侧向动土压力的方法,定义土体液化程度量化指标,进一步验证轮胎加筋砂垫层抗液化效果;振动过程中轮胎加筋垫层表面沉降范围为11.3~15.7 mm,表现出较好的变形协调性能。Waste rubber tires are filled with bulk materials to form reinforced earth structures,which have been applied to soil foundations,retaining walls,and guard reinforcement projects,showing an obvious effect on vibration isolation.However,few studies have addressed the liquefaction resistance of tire-reinforced soil.Three groups of small shaking table tests were performed to verify the liquefaction resistance of tire-reinforced sand cushions by changing the drainage conditions of the tire cushion.The results show that tire-reinforced sand cushions have a good liquefaction resistance effect.Compared with a rigid cushion,the differences in the peak excess pore pressure ratio and residual excess pore pressure ratio range between 0.01-0.19 and 0.08-0.16,respectively.The drainage channels provided by tire-reinforced sand cushions inhibit the development of excess pore water pressure and accelerate the dissipation of excess pore water.Pore water is discharged along the interface between the tires and the soil below and the drain channels between the tires.The quantitative index of the soil liquefaction degree is defined by measuring lateral earth pressure,further verifying the liquefaction resistance of tire-reinforced sand cushions.During the vibration process,the tire-reinforced sand cushions have a surface settlement range of 11.3-15.7 mm,showing good deformation coordination performance.

关 键 词：轮胎 加筋 抗液化 振动台试验 

分 类 号：TU411.8[建筑科学—岩土工程]