冻融循环作用下混合土回填层力学性质变化及对基础稳定性的影响  

The Change of Mechanical Property of Mixed Soil Backfill Layer under Freezing and Thawing Cycle and Its Influence on Foundation Stability

作　　者：刘欢 LIU Huan(China Road&Bridge Corporation,Beijing 100011,China)

机构地区：[1]中国路桥工程有限责任公司,北京100011

出　　处：《工程技术研究》2024年第23期19-21,共3页Engineering and Technological Research

摘　　要：混合土回填层在冻融循环作用下会发生力学性质变化,进而影响基础稳定性。文章通过室内冻融循环试验和现场监测,研究了不同冻融循环次数下混合土的强度、变形特性变化规律。结果表明,随着冻融循环次数的增加,混合土的强度逐渐降低,变形量增大。基于试验数据,建立了混合土力学性质与冻融循环次数的关系模型,并分析了这种变化对基础承载力和基础沉降的影响,可为寒区混合土回填基础的设计和施工提供参考。The mechanical properties of the mixed soil backfill layer will change under the action of freezing and thawing cycle,which will affect the stability of the foundation.This paper studies the change law of the strength and deformation characteristics of mixed soil under different numbers of freezing and thawing cycles by indoor freezing and thawing cycle test and field monitoring.The results show that with the increase of the number of freezing and thawing cycles,the strength of mixed soil decreases gradually and the deformation increases.Based on the test data,the relationship model between the mechanical properties of mixed soil and the number of freezing and thawing cycles is established,and the influence of this change on the bearing capacity and settlement of the foundation is analyzed,which can provide reference for the design and construction of mixed soil backfill foundation in cold regions.

关 键 词：混合土回填层 冻融循环 基础稳定性 

分 类 号：TU43[建筑科学—岩土工程]