小型加筋土试件电阻率响应特征

赵亚文¹，刘勇^1*，刘长青²

1.山东交通学院交通土建工程学院，山东 济南  250357；2.临沂恒佳物业管理有限公司，山东 临沂  276000

摘要：为研究加筋土试件电阻率随加载时间、荷载及筋带应变变化的耦合关系，采用万能压力机和模具配合压制加筋土试件，在设计位置埋设CPE3020型钢塑复合拉筋带，采用万用表测量加筋土试件电阻率变化，研究其电阻率响应特性。试验结果表明：加筋土试件电阻率随加载时间、荷载和筋带应变的增大而减小；相同压实度下，含水率越高，加筋土试件电阻率越小；相同含水率下，压实度越大，加筋土试件电阻率越小；压实度越小，加筋土试件电阻率突变越早，试件承载能力越弱；压实度越大，加筋土试件电阻率突变越晚，试件承载能力越强；加筋土试件破坏时，电阻率突变对预测加筋土试件破坏程度问题有较好的响应特征。

关键词：加筋土；压实度；含水率；电阻率；响应特征；土体稳定性

Response characteristics of resistivity in small reinforced soil specimens

ZHAO Yawen¹，LIU Yong^1*，LIU Changqing²

1.School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China;

2.Linyi Hengjia Property Management Co., Ltd., Linyi 276000, China

Abstract: To study the coupling relationship between the resistivity of reinforced soil and the loading time, load magnitude, and strain of the reinforcement, a universal testing machine and mold are used to compress reinforced soil specimens. CPE3020 type steel-plastic composite reinforcement strips are embedded at designated positions, and a multimeter is used to measure the changes in resistivity of the soil specimens, investigating the resistivity response characteristics of small reinforced soil specimens. The experimental results indicate: the resistivity of the soil specimens decreases with the increase of loading time, load, and strain of the reinforcement; under the same degree of compaction, higher moisture capacity results in lower soil specimens resistivity; under the same moisture capacity, greater compaction leads to lower soil specimens resistivity; the smaller the degree of compaction, the earlier the sudden change in soil specimens resistivity occurs, and the weaker the bearing capacity of the specimen; the greater the degree of compaction, the later the sudden change in soil specimens resistivity occurs, and the stronger the bearing capacity of the specimen; when the reinforced soil specimens fails, the sudden change in resistivity has a good response characteristic for predicting the damage degree of the reinforced soil body.

Keywords: reinforced soil; degree of compaction; moisture capacity; resistivity; response characteristics; soil stability