摘要
为研究高温加热对分散土的力学特性的影响,采用直接剪切试验、崩解试验、渗透试验、颗粒分析试验和矿物分析试验,对不同温度下加热处理的分散土试样进行研究,并综合分析高温改性土体的内在机制.结果表明:加热处理后,分散土的黏聚力、内摩擦角及抗剪强度均大幅增加,渗透系数增大,崩解突变性消失,稳定性得到提高.加热400℃时,土样的黏聚力、内摩擦角、抗剪强度分别比常温状态下的土样提高了811%、154%和664%,此外,加热400℃的土样在水中不崩解,渗透系数比常温状态下增大12.6 倍.这些变化主要归因于高温加热导致的土体失水收缩、矿物烧结形变以及分散性的减弱.高温加热是一种方便可行的分散土原位处置技术,具有良好的应用前景.
Abstract
To investigate the impact of high-temperature heating on the mechanical properties of dispersive soil,direct shear tests,disintegration tests,permeability tests,particle analysis tests,and mineral analysis tests were employed to study dispersive soil samples heated at various temperatures,and the internal mechanism of high-temperature modified soil was comprehensively analyzed.The results show that after heat treatment,the cohesion,internal friction angle,and shear strength of dispersive soil all increase significantly,the permeability coefficient increases,the disintegration mutation disappears,and the stability is improved.When heated at 400℃,the cohesion,internal friction angle,and shear strength of the soil samples increase by 811%,154%and 664%compared to those at normal temperature,re-spectively.In addition,the soil sample heated at 400℃does not disintegrate in water,and the permeability coeffi-cient increases by 12.6 times compared to the soil at normal temperature.These changes are mainly attributed to the soil shrinkage due to water loss,mineral sintering deformation,and reduction in dispersivity,which are caused by high-temperature heating.In summary,high-temperature heating is a convenient and feasible in-situ treatment technol-ogy for dispersive soil,which has good application prospects.
NETL
NSTL
维普
万方数据