有压单向冻结橡胶加筋膨胀土的动力特性研究  

Study on dynamic characteristics of unidirectional frozen rubber-reinforced expansive soil under confining pressure

作　　者：程兆杰 杨忠年[1] 王阳阳 崔郁雪 凌贤长[1,3] 孙振兴 王荣昌 CHENG Zhaojie;YANG Zhongnian;WANG Yangyang;CUI Yuxue;LING Xianzhang;SUN Zhenxing;WANG Rongchang(Department of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Shandong Provincial No.4 Institute of Geological and Mineral Survey,Shandong Weifang 261021,China;Department of Civil Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]山东省第四地质矿产勘查院,山东潍坊261021 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150001

出　　处：《西安建筑科技大学学报(自然科学版)》2024年第6期819-828,共10页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金(4217071578);国家重大仪器开发项目(41627801)。

摘　　要：废旧橡胶在岩土工程和环境地质工程中已得到广泛应用,许多学者利用橡胶进行土体的改良.然而橡胶加筋膨胀土有着更加复杂的力学性质,尤其是动力特性方面仍处于空白.因此本文利用自研温控动三轴设备,探究了有压单向冻结条件下冻结温度及橡胶粒径对橡胶加筋膨胀土动力特性的影响.结果表明:(1)有压冻结条件下,随温度的降低动剪切模量呈先增加后减小的趋势,当T=-12℃时,动剪切模量达到最大.(2)相同掺量下随着橡胶粒径增加,橡胶加筋膨胀土最大动剪切模量出现的负温也随之提高.粒径为0.25 mm时最大动剪切模量出现在-4℃,而粒径为0.43 mm时出现在-8℃.(3)橡胶粒径从2 mm降至0.18 mm,橡胶加筋膨胀土应力应变曲线的线弹性阶段范围略有增加,线弹性范围增加了0.283%.Waste rubber has been widely used in geotechnical engineering and environmental geological engineering,and many scholars have used waste rubber for soil improvement.However,rubber-reinforced expansive soils have more complex mechanical properties,especially in terms of its dynamic characteristics,which remain unexplored.In this paper,the effects of freezing temperature and rubber particle size on the dynamic properties of rubber-reinforced expansive soil under confining pressure are investigated by using self-developed temperature-controlled dynamic triaxial equipment.The results show that:(1)Under confining pressure,the dynamic shear modulus tends to increase and then decrease with decreasing temperature.When T=-12℃,the dynamic shear modulus reaches the maximum.(2)With the increase of rubber particle size under the same mixture,the negative temperature for the maximum dynamic shear modulus of rubber-reinforced expansive soil also increases.When the particle size is 0.25 mm,the maximum dynamic shear modulus appears at-4℃,and when the particle size is 0.43 mm,it appears at-8℃.(3)When the rubber particle size decreases from 2 mm to 0.18 mm,and the range of linear elastic phase of rubber reinforced expanded soil stress-strain curve increases slightly,and the range of linear elasticity increases by 0.283%.

关 键 词：膨胀土 橡胶加筋 有压单向冻结 橡胶粒径 骨干曲线 动剪切模量 

分 类 号：TU432[建筑科学—岩土工程]