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以京津高铁和杭州地铁沿线的两种典型粉质黏土为研究对象,并采用英国GDS多功能三轴仪完成了静、动力强度测试,研究了两种土的静力不排水抗剪强度和在交通荷载高振次循环下的动强度、临界动应力比、应变发展模式以及振后抗剪强度等方面的差异。对比发现,长期循环荷载作用下两种土的应变发展和振后强度均有很大不同。与京津地区粉质黏土相比,杭州地铁沿线土含水率高、孔隙比大、密度低、灵敏度高、强度低。两种原状土在小幅振动后土体强度略有增大,而随振幅增大,振后强度将低于未经历振动时的不排水强度值;而重塑土振后强度均低于静剪强度。
Taking the two typical silty clay along the Beijing-Tianjin high-speed rail and the Hangzhou subway as the research object, static and dynamic tests were carried out by using the British GDS multi-purpose triaxial apparatus. Static and undrained shear strengths The dynamic strength, the critical dynamic stress ratio, the mode of strain development and the post-vibration shear strength of the traffic load under high vibration cycles are different. It is found that the strain development and post-vibration strength of the two kinds of soil under long-term cyclic loading are all very different. Compared with the silty clay in Beijing-Tianjin area, the soil moisture along the Hangzhou subway has a high ratio of porosity, low density, high sensitivity and low strength. The soil strength of the two undisturbed soils slightly increases, but with the increase of the amplitude, the post-vibration strength will be lower than that of undrained undrained strength. However, the strength of the remodeled soils is lower than the static shear strength .