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随着中国高速公路不断向西部山区发展,经常会遇到以土石混合料为填料的路堤及边坡。土石混合体其物理力学性质较为复杂且试样难以采集,目前对于此类土干湿循环状态下强度的研究还不够深入。笔者以某高速公路路基施工现场的8个野外大面积土石混合体水平推剪试验为基础,得出了天然及浸水饱和条件下土石混合体的强度参数并分析了这两种状态下土石混合体应力-应变曲线及剪切变形机理,为山区高速公路设计及施工提供依据。
As China’s highways continue to develop in the western mountainous regions, they often encounter embankments and slopes filled with soil-stone mixture. The physical and mechanical properties of soil-rock mixture are complex and the samples are difficult to collect. At present, the research on the strength of soils under wet-dry conditions is not deep enough. Based on the horizontal push-shear tests of eight large-scale large-area soil-rock mixes at the construction site of a highway, the authors obtained the strength parameters of the rock-soil mix under natural and saturated water saturation conditions and analyzed the relationship between the soil- Stress-strain curve and shear deformation mechanism, provide the basis for the design and construction of mountain expressway.