黏性土和纤维对风积沙改性土热膨胀特性的影响  

Effect of Clayey Soil and Fiber on Thermal Expansion of Aeolian Sand Modified Soil

作　　者：周富彪 苏占东[1] 田梦楠 李高[4] 陈祥[5] 孙进忠 ZHOU Fubiao;SU Zhandong;TIAN Mengnan;LI Gao;CHEN Xiang;SUN Jinzhong(Geotechnical Research Center,Institute of Disaster Prevention,Langfang 065201,China;Institute of Karst Geology,Chinese Academy of Geologecal Sciences,Guilin 541004,China;College of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;China Non-ferrous Metals Resource Geological Survey,Beijing 100012,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]防灾科技学院岩土工程研究中心,廊坊065201 [2]中国地质科学院岩溶地质研究所,桂林541004 [3]中国地质大学(北京)工程技术学院,北京100083 [4]有色金属矿产地质调查中心,北京100012 [5]北京交通大学土木建筑工程学院,北京100044

出　　处：《硅酸盐通报》2020年第1期199-205,共7页Bulletin of the Chinese Ceramic Society

基　　金：中央高校基本科研业务费-创新团队基金(ZY20180106)

摘　　要：风积沙改性土的热膨胀特性对评价风积沙改性土路基温度稳定性至关重要。通过在风积沙中掺入不同质量的水泥、黏性土或聚丙烯纤维制成不同配比的改性土,测试改性土的热膨胀系数,研究外加材料的掺入量对改性土热膨胀特性的影响。试验结果表明:改性土的平均线膨胀系数随着水泥掺入量的增加总体呈增大趋势,随着聚丙烯纤维掺入量的增加而减小,随着黏性土掺入量的增加而增大。聚丙烯纤维的掺入可有效降低改性土的热膨胀系数。研究成果可为进一步优化改性土提供研究方向,为高温差沙漠地区工程建设中风积沙改性土温度裂缝的控制提供试验依据。The thermal expansion properties of aeolian sand modified soil are critical to estimate the thermal stability of the modified soil embankment.The coefficient of thermal expansion of modified soil with different quality of cement,clayey soil or polypropylene fiber material were tested,and the influence of the amount of material doping on the properties of the modified soil were studied.The experimental results show that the average coefficient of linear expansion of modified soil increases with the increase of the amount of cement or the increase of the amount of clayey soil,but decreases with the increase of the amount of polypropylene fiber.The mixing of polypropylene fiber can effectively reduce the coefficient of thermal expansion of modified soil.The results can provide a research direction for the further optimization of the modified soil,and an experimental basis to control the temperature crack of aeolian sand modified soil of engineering construction in the high temperature difference desert areas.

关 键 词：风积沙改性土 水泥 黏性土 聚丙烯纤维 热膨胀系数 

分 类 号：TU411.2[建筑科学—岩土工程]