蒙巴萨西站松软土地段高路堤地基处理方案研究

结合蒙内铁路DMK7+660～+920软土地段高路堤地基实际工况，建立软土高路堤稳定与沉降计算模型并验算，同时比较“碎石桩加固”和“基底换填+强夯+反压护道”两种方案。结果表明:天然状态下的松软土地段高路堤在沉降和稳定性方面不能满足要求；路基沉降最大位置位于路基中心，其次为左右路肩及左右边桩，且左右路肩沉降趋势相同，左右边桩沉降趋势相同；从沉降监测数据和运营状态来看，采用“基底换填+强夯+反压护道”方法，保证了蒙巴萨西站高路堤的稳定。

Study on the Foundation Treatment of High Embankment in Soft Soil Region of Mombasa West Station

Based on the engineering conditions of high embankment foundation on soft soil section DMK7+660~+920 of Mombasa-Nairobi Standard Gauge Railway, the calculation model for stability and settlement of high embankment in soft soil regional was established and calculated in this paper, while the two programs of gravel pile reinforcement and base replacement+dynamic compaction+berm with superloading are compared. The results show that:In the natural state, high embankment on soft soil section can’t meet the requirements in settlement and stability. The maximum settlement of the subgrade is located at the center of the subgrade, followed by the left and right shoulder and the left and right side piles and the settlement trend of left and right shoulder is the same, which is also the same in the left and right side pile. The stability of high embankment of Mombasa-Nairobi west station is guaranteed with the use of base replacement+dynamic compaction+berm with superloading in terms of settlement monitoring data and operation status.