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在滇黔地区公路建设中,沿线边坡表层经常广泛分布着红棕色玄武岩风化土,厚度较大,风化程度较高,降雨作用对边坡的稳定影响较大。土质边坡的稳定性在很大程度上取决于土的抗剪强度指标,但目前对玄武岩风化土的强度缺乏系统深入的研究,给该地区工程建设带来了挑战。通过现场原位推剪试验和一系列室内土工试验,得出了该红棕色玄武岩风化土的抗剪强度指标变化规律、含水量对土体强度的影响、峰值强度和残余强度之间的差异,为边坡稳定性分析提供了必要的参考依据。
In the highway construction in Yunnan, Guizhou, red-brown basalt weathering soil is often widely distributed along the surface of slope, with thicker thickness and higher degree of weathering. Rainfall has a great influence on slope stability. The stability of soil slope depends largely on the shear strength index of soil. However, the current research on the strength of basalt weathering soil lacks a systematic and in-depth study, which brings challenges to the engineering construction in this area. The in-situ shear test and a series of indoor geotechnical tests were carried out to determine the variation of shearing strength index, the influence of water content on soil strength, the difference between peak intensity and residual strength of reddish brown basalt weathering soil, It provides the necessary reference for slope stability analysis.