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该文以某高速公路土钉支护边坡工程为依托,通过大量三轴试验和FLAC3D数值模拟,深入分析了水对路堑边坡变形的影响,得出如下结论:水-土作用和水-钉作用降低了边坡土体的摩阻力和内聚力,削弱了钉土界面的粘摩阻力,使边坡趋于不稳定;随着土体含水量的增加,粘土的强度大大降低,但粘聚力和内摩擦角与含水量并不呈线性关系;土钉支护边坡可减少1/3的水平位移,且未支护边坡的最大位移发生在坡脚,土钉支护边坡的最大位移发生在坡顶,设计时宜适当加长边坡上部土钉的长度,边坡与土钉单元构成一个整体,失稳时趋向于整体式破坏。
Based on the project of soil nailing support slope on a highway, the paper deeply analyzes the influence of water on the deformation of cutting slope through a large number of triaxial tests and numerical simulation of FLAC3D, and draws the following conclusions: water-soil interaction and water- The nailing reduces the friction and cohesion of the slope soil, weakens the viscous-friction resistance of the soil-nail interface and makes the slope unstable. With the increase of soil water content, the strength of the clay is greatly reduced, but the cohesion The linear relationship between force and internal friction angle and water content is not linear. The soil nailing slope can reduce the horizontal displacement by 1/3, and the maximum displacement of the unsupported slope occurs at the foot of slope, soil nailing slope The maximum displacement occurred at the top of the slope. The design should be appropriate to lengthen the length of the soil nail above the slope, and the slope and the soil nail unit form a whole, and tend to be monolithic in the event of instability.