软岩填料湿化变形规律

Wetting Deformation Characteristics of Soft Rock Filler

分别对风干和饱和状态软岩填料进行了中型三轴压缩试验,得到了不同围压条件材料的变形规律。采用双线法,以同一轴向偏应力下风干及饱和状态材料的应变差值作为其湿化变形,主要分析了围压对其变化规律的影响,得到了以下规律:①相对于风干状态,围压对饱和状态填料变形规律影响更大;②湿化变形发展分为两个阶段,以湿化变形发展到临界值为分界,后一阶段湿化变形显著增大;③在湿化变形发展到临界值之前的初始阶段中,围压不是其主要影响因素,第二阶段中围压对其影响明显;④给出了湿化变形分析回归公式并进行了验证。

Medium triaxial compression tests of air-dried and saturated soft rock fillers were carried out,and the deformation of materials under different confining pressure conditions were obtained.Using double-line method,the strain difference of air-dried and saturated materials under the same axial deviatoric stress was taken as the wetting deformation,and the influence of confining pressure on its variation was analyzed.Results show that:①compared with air-dried state,confining pressure had a greater influence on the deformation of saturated state fillers.②The development of wetting deformation could be divided into two stages,before and after the wetting deformation value reached the critical value as the boundary value.③In the first stage,the confining pressure was not the main influencing factor while in the second stage the confining pressure was an obvious factor,during which wetting deformation increased significantly.④At last,the regression equation of wetting deformation was given and verified.