湿度变化下纤维纱加筋土动力响应试验研究  

Experimental Study on the Dynamic Characteristics of Soil Reinforced with Fiber Yarn under Different Humidity Conditions

作　　者：褚峰 薛沛柯 张宏刚 邓国华[3,4] Chu Feng;Xue Peike;Zhang Honggang;Deng Guohua(College of Urban Planning and Municipal Engineering,Xi'an Polytechnic University,Xi'an 710048,P.R.China;China Coal Engineering Ecological Environment Technology Co.LTD,Beijing 100013,P.R.China;Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710048,P.R.China;Xi'an Loess Underground Engineering Technology Consulting Co.,Ltd.,Xi'an 710061,P.R.China)

机构地区：[1]西安工程大学城市规划与市政工程学院,西安710048 [2]中煤科工生态环境科技有限公司,北京100013 [3]西安理工大学岩土工程研究所,西安710048 [4]西安黄土地下工程技术咨询有限公司,西安710061

出　　处：《地下空间与工程学报》2025年第1期140-149,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金资助项目(52178355);陕西省自然科学基础研究计划资助项目(2020JM-572);西安市碑林区科技计划资助项目(GX2148)。

摘　　要：在实际工程中,湿度的变化会显著影响土体的动力变形特性。以纤维纱加筋黄土为研究对象,利用动三轴仪对不同含水量条件下的纤维纱加筋黄土进行动应力应变、动强度及震陷特性试验研究,分析了湿度的不同对纤维纱加筋黄土动应力应变关系、动强度及残余应变(即震陷系数)的影响规律。结果表明:同一围压、同一动剪应变条件下,纤维纱加筋黄土动剪应力随着含水量的增大呈先增大后减小的变化趋势;同一振次条件下,随着含水量的增大,动剪应力呈先增大后减小的变化趋势;当含水量在塑限含水量附近时,纤维纱加筋黄土的动剪应力最大;同一振次条件下,纤维纱加筋黄土的残余应变随着含水量的增大呈先减小后增大的变化趋势;当含水量在塑限含水量附近时,残余应变最小,当含水量超过塑限含水量后,残余应变受含水量增大的影响逐渐减弱;随着振次的增加,含水量的增大对于纤维纱加筋黄土震陷特性的影响逐渐减弱。研究可为纤维纱加筋黄土工程的施工提供指导。In practical engineering,the change of humidity will significantly affect the dynamic deformation characteristics of soil.Taking the fiber yarn reinforced loess as the research object,the dynamic triaxial apparatus was used to test the dynamic stress-strain,dynamic strength and seismic subsidence characteristics of fiber yarn reinforced loess under different water content conditions.The influence of different humidity on the dynamic stress-strain relationship,dynamic strength and residual strain(i.e.seismic subsidence coefficient)of fiber yarn reinforced loess is analyzed.The test results show that:Under the same confining pressure and dynamic shear strain,the dynamic shear stress of fiber reinforced loess first increases and then decreases with the increase of water content;Under the same vibration times,with the increase of water content,the dynamic shear stress first increases and then decreases;When the moisture content is near the plastic limit moisture content,the dynamic shear stress of fiber reinforced loess is the largest;Under the same vibration times,the residual strain of fiber yarn reinforced loess decreases first and then increases with the increase of water content;When the water content is near the plastic limit water content,the residual strain is minimum,when the water content exceeds the plastic limit water content,the influence of the increase of water content on the residual strain decreases gradually;With the increase of vibration times,the influence of the increase of water content on the seismic subsidence characteristics of fiber reinforced loess is gradually weakened.The research has important theoretical and practical significance for the construction of fiber yarn reinforced loess project.

关 键 词：黄土 纤维纱加筋 湿度 动应力-动应变 动强度 残余应变 影响规律 

分 类 号：TU411[建筑科学—岩土工程]