增湿对斥水土壤压实性的影响研究  

Effect of humidification on the compactness of water-repellent soil

作　　者：穆璇 吴玉琴 MU Xuan;WU Yuqin(College of Water Conservancy,Yunnan Agricultural University,Kunming 650201,Yunnan,China)

机构地区：[1]云南农业大学水利学院,云南昆明650201

出　　处：《水利水电技术（中英文）》2021年第10期199-208,共10页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(41867038,41662021)。

摘　　要：土壤的变形特性是工程领域中要考虑的一大因素,其直接影响着工程施工与安全。本文在增湿和不增湿条件下对不同初始干密度的斥水、亲水土试样进行了压缩试验,试验结果表明:相同荷载作用下,初始干密度相同的斥水土壤的抗压实能力要强于亲水土壤。当土壤初始干密度较小时,增湿会明显增加亲水土壤的压缩性,但增湿对土壤压实的影响会随着土壤干密度的增大而减小。即使土壤干密度较小,增湿对斥水土试样的压缩性影响也很小。当外荷载小于400 kPa,亲水或斥水试样的孔隙比e和外荷载p的关系可以用直线拟合。较大初始荷载基础上增加荷载所引起的土壤沉降量可能大于也可能小于较小初始荷载基础上增加相同荷载所引起的沉降量。因此增湿或不增湿条件下的斥水土壤和亲水土壤的压实特性都有较为明显的差别。研究成果为斥水土合理运用于实际生产活动提供依据和参考。Deformation characteristics of soil is a major factor to be considered in the field of engineering,which directly affects engineering construction and safety.In this paper,the compression tests of hydrophilic and water-repellent soil samples with different initial dry densities are carried out under the conditions of humidification and non-humidification.The study results show that under the same load,water-repellent soil with the same initial dry density has stronger compaction resistance than hydrophilic soil.When the initial dry density of the soil is small,humidification will obviously increase the compressibility of the hydrophilic soil,but the impact of humidification on soil compaction will decrease with the increase of the dry density of the soil.Even if the dry density of the soil is small,humidification has little effect on the compressibility of water-repellent soil samples.When the external load is less than 400kPa,the relationship between the pore ratio e and the external load p of the hydrophilic or water-repellent samples can be fitted with a straight line.The amount of soil settlement caused by the increase of the load on the basis of a larger initial load may be greater or may also be less than the amount of settlement caused by the increase of the same load on the basis of a smaller initial load.Therefore,the compaction characteristics of water-repellent soil and hydrophilic soil under humidified or non-humidified conditions are significantly different.The research results provide a basis and reference for the rational use of water-repellent soil in actual production activities.

关 键 词：压实 压缩试验 增湿 斥水土 E-P曲线 

分 类 号：TV16[水利工程]