冻融循环作用下钢渣粉改良膨胀土的膨胀与压缩性能试验  

Experiment on expansion and compression properties of expansive soil improved by steel slag powder under freeze-thaw cycles

作　　者：吴燕开[1,2] 王浩 于佳丽 史可健 韩天 李丹丹 曹玉鹏 WU Yankai;WANG Hao;YU Jiali;SHI Kejian;HAN Tian;LI Dandan;CAO Yupeng(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;College of Transportation, Shandong University of Science and Technology, Qingdao, Shandong 266590, China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590 [3]山东科技大学交通学院,山东青岛266590

出　　处：《中国科技论文》2020年第2期160-166,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(51608312);山东科技大学科研创新团队支持项目(2015KYDT104)。

摘　　要：通过掺加水泥、钢渣粉及氢氧化钠改良膨胀土,进行无荷膨胀率试验、无侧限抗压强度试验及三轴压缩试验。研究冻融循环条件下水泥改良膨胀土(ES-C)、钢渣粉水泥改良膨胀土(ES-SSP-C)及钢渣粉水泥氢氧化钠改良膨胀土(ES-SSP-C-SH)的力学性能。结果表明:各改良土的自由膨胀率排序为ES-SSP-C试样<ES-C试样<ES-SSP-C-SH试样;各改良土的初始强度排序为ES-SSP-C-SH试样>ES-C试样>ES-SSP-C试样;随龄期的增长,各试样的强度均呈持续上升态势,相同循环次数的试样强度也随龄期的增长而增大。三轴压缩时,改良后的膨胀土的破坏面并未贯穿整个试样。研究表明钢渣粉改良膨胀土具有较大优势,掺加钢渣粉具有抵抗冻融侵蚀的作用。The swelling rate test,unconfined compressive strength test and triaxial compression test were carried out for the expansive soil improved by adding cement,steel slag powder and sodium hydroxide.The mechanical properties of cement modified expansive soil(ES-C),steel slag powder cement modified expansive soil(ES-SSP-C)and steel slag powder cement sodium hydroxide modified expansive soil(ES-SSP-C-SH)under freeze-thaw cycles were studied.The results show that the order of free expansion rate of each improved soil is ES-SSP-C sample<ES-C sample<ES-SSP-C-SH sample;the order of initial strength of each improved soil is ES-SSP-C-SH sample>ES-C sample>ES-SSP-C sample.With the increase of age,the strength of each sample keeps rising,and the strength of samples with the same number of cycles also increases with the increase of age.Under triaxial compression,the failure surface of the improved expansive soil does not penetrate the whole specimen.The results show that the improvement of expansive soil with steel slag powder has great advantages,and the addition of steel slag powder has the effect of resisting freeze-thaw erosion.

关 键 词：冻融循环 改良膨胀土 无荷膨胀率 无侧限抗压强度 三轴压缩试验 钢渣粉 

分 类 号：TU443[建筑科学—岩土工程]