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我国南方地区边坡广泛分布有土石混合的残积土层,残积土层下卧有基岩,常由于降雨和地下水渗流导致坡体失稳。依据这一工程背景开展了室内模型试验研究,利用衡阳某隧道花岗岩残积土和级配碎石混合来模拟现场残积土,用医用滴管来模拟降雨,用预埋的接自来水的带孔PVC管模拟潜水,研究了潜水单独渗流然后经历不同降雨强度的边坡土体内部沉降、土压力和土体含水量的变化。试验表明,随着潜水渗流和降雨的进行,土体含水量不断增加,但不同位置增加程度不一,边坡中间层含水量最大,土压力和土体内部沉降不明显,边坡破坏主要表现为潜蚀。
There are a lot of residual soil layers mixed with soil and stone in the southern slope of our country. There are bedrock under the residual soil layer, and the slope is often unstable due to rainfall and groundwater seepage. Based on the background of this project, the indoor model test was conducted. The remnant soil of the site was simulated by mixing granite remnant soil and graded macadam in a tunnel in Hengyang. The medical drip pipe was used to simulate the rainfall. An embedded PVC pipe with tap water Simulated diving, the subsidence of submerged submerged and then subjected to different rainfall intensities within the slope soil subsidence, earth pressure and soil moisture content changes. The results show that with the progress of submersion seepage and rainfall, the water content of soil increases continuously, but the degree of increase in different positions is different. The water content of middle slope is the largest, soil pressure and internal settlement are not obvious, For the potential erosion.