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青藏铁路在多年冻土南界地区,夏季强降雨后的入渗,不仅破坏了冻土路基内地温场,降低了土体的强度,同时入渗产生的渗透压力降低了斜坡路基的稳定性。文章采用有限元对青藏铁路安多段多年冻土斜坡路基进行降雨入渗的模拟,并将渗流分析结果作为路基稳定性计算的水力条件。计算结果表明,该冻土斜坡稳定性系数在降雨结束20h内持续变小,而最小值出现在降雨后2d左右。
The infiltration of Qinghai-Tibet Railway in permafrost areas in the south of the permafrost area after heavy rains in summer not only destroyed the temperature field in the permafrost subgrade but also reduced the strength of the soil mass. Meanwhile, the seepage pressure caused by infiltration decreased the stability of slope subgrade. This paper simulates the rainfall infiltration on the slope of permafrost along the Qinghai-Tibet Railway on the Qinghai-Tibet Railway, and takes the seepage analysis results as the hydraulic conditions for the stability calculation of subgrade. The calculation results show that the slope stability coefficient of the frozen soil decreases continuously within 20 hours after the end of rainfall, while the minimum value appears about 2 days after rainfall.