水利学报2024，Vol.55Issue(6)：686-697,12.DOI:10.13243/j.cnki.slxb.20230494
剪切大变形条件下心墙沥青混凝土渗透特性研究
Permeability study of asphalt concrete in core wall under shear large deformation conditions
摘要
Abstract
In order to study the permeability characteristics of asphalt concrete of heart wall under large shear de-formation conditions,based on a set of triaxial shear axial seepage test system developed independently,triaxial shear seepage tests with different combinations of peripheral and permeation pressures were carried out on asphalt concrete of No.70 and No.110,and the optimal model for inversion of permeability coefficient of asphalt concrete was proposed based on the global optimization algorithm.The results show that:(1)the shear expansion effect causes the opening and expansion of cracks,which increases the permeability coefficient significantly.The axial strain of two different grades of asphalt concrete reaches 8％to 30％under different circumferential pressures,and the increase of permeability coefficient reache 2 to 3 orders of magnitude.(2)The strain state and strain increment affect the permeability of asphalt concrete,and the permeability coefficient changes with the strain field.In the compaction stage,with the increase of axial strain,the volume increment ratio is negative and the permeability co-efficient decreases;in the crack development stage,the volume increment ratio is positive and the permeability co-efficient increases.(3)Perimeter pressure has a significant effect on the permeability of asphalt concrete.The axial strain corresponding to the two grades of asphalt concrete specimens reaching the impermeability safety thresh-old is small at low perimeter pressure,and shows an increasing trend with the increase of perimeter pressure.When the perimeter pressure was loaded to 1.0 MPa and the axial strain increased to 30％,the impermeability coefficient of asphalt concrete still did not exceed the impermeability safety threshold.关键词
水工沥青混凝土/大剪切变形/渗透特性/轴向应变/反演模型Key words
hydraulic asphalt concrete/large shear deformation/permeability characteristics/axial strain/in-version model分类
信息技术与安全科学引用本文复制引用
何建新,李豪,杨武,刘亮..剪切大变形条件下心墙沥青混凝土渗透特性研究[J].水利学报,2024,55(6):686-697,12.基金项目
新疆维吾尔自治区自然科学基金项目(2022D01A199,2021D01A100) （2022D01A199,2021D01A100）
