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采用双线法,对十堰—天水高速公路安康西段的变质软岩路堤填料,在两种密度条件下进行了大型三轴试验,同一竖向偏应力下饱和与风干状态填料应变的差值即为湿化引起的应变,对其变化规律进行分析,结果表明:填料的湿化变形发展呈两个阶段,临界湿化应变的大小与竖向偏应力和围压的比值密切相关,同一密度、不同围压条件下的各曲线变化点的湿化应变值较为一致;填料密度增大,则变化点的湿化应变值增加,说明密度和围压不仅影响湿化变形的大小,还影响其发展规律。根据3种围压条件下的试验结果,对两种密度的填料,分别建立了填料湿化变形发展规律的公式,并用新的第4种围压条件下的试验结果进行校核,吻合程度较好。该公式可用于分析高速公路施工中路堤湿化变形的大小及发展规律。
The double-line method was used to conduct a large-scale triaxial test on the metamorphic soft rock embankment packing of Ankang west section of Shiyan-Tianshui expressway. The difference between the strain of saturated and air-dried packing under the same vertical deviatoric stress The results show that the wet deformation of filler is in two stages. The critical wetting strain is closely related to the ratio of vertical deviatoric stress and confining pressure. The same density, Under different confining pressures, the values of wetting strain at each curve change point are consistent. When the packing density increases, the wetting strain at the changing point increases, indicating that density and confining pressure not only affect the size of wetting deformation but also affect its development law. According to the test results under the three kinds of confining pressure conditions, the formula of the law of development of wetting deformation of filler was established respectively for the two kinds of packing, and the result of the test under the fourth confining pressure condition was checked. it is good. The formula can be used to analyze the size and development of embankment wet deformation in highway construction.