In order to deeply study the failure mechanism of red clay slope engineering under the influence of gradients and natural environment, Guizhou red clay was chosen as the research object and two slope models with different gradients were established respectively. The indoor dry-wet cycle test of the red clay slope was conducted. With the finite element software, this study examined the evolution of slope displacement, moisture content, and pore water pressure with time at different angles. It also analyzed the failure modes of slopes at different angles. The results showed that: (1) the forms of slope failure were mainly splashing, surface erosion and gully, and the slope failure was caused by the combination of rainwater infiltration and runoff erosion; (2) under the same climatic conditions, when the slope became steeper, the influence of rain infiltration and sunshine was greater. Besides, there was an increase in the overall value of the moisture content, pore water pressure, and amplitude of variation. Furthermore, the internal soil strength decreased, while the horizontal displacement accelerated exponentially; and (3) no obvious sliding surface was found during the test. The displacement increased from the crest of the slope to the toe of the slope. The collapse began to occur from the toe of the slope, and the coalescence of multiple disintegrations caused the landslide.

为了深入研究红土边坡工程在坡度和自然环境影响下的破坏机理，以贵州红土为研究对象，分别建立了两个坡度不同的边坡模型。进行了红土边坡的室内干湿循环试验。使用有限元软件，本研究检查了不同角度下坡度位移，水分含量和孔隙水压力随时间的变化。还分析了不同角度的边坡破坏模式。结果表明：（1）边坡破坏的形式主要为飞溅，表面侵蚀和沟壑，边坡破坏是雨水入渗与径流侵蚀相结合引起的；（2）在相同的气候条件下，当坡度变陡时，雨水入渗和日照的影响更大。此外，水分含量，孔隙水压力和变化幅度的总值有所增加。此外，内部土壤强度降低，而水平位移呈指数级增长。（3）试验过程中未发现明显的滑动面。位移从斜坡的顶部到斜坡的脚趾增加。塌方开始从斜坡的脚趾开始，多次崩塌的合并导致滑坡。（3）试验过程中未发现明显的滑动面。位移从斜坡的顶部到斜坡的脚趾增加。塌方开始从斜坡的脚趾开始，多次崩塌的合并导致滑坡。（3）试验过程中未发现明显的滑动面。位移从斜坡的顶部到斜坡的脚趾增加。崩塌从斜坡的脚趾开始发生，多次崩解的合并导致滑坡。