软土地区临近运营高铁路基建筑基坑防护方案研究

Analysis on Protection Scheme for Foundation Pit in Soft Soil Area Adjacent to Existing High-speed Railway

高速铁路运营速度快、轨道平顺性要求高;对于临近运营高铁路基的基坑开挖,尤其在软土地区,合理的基坑防护可以有效降低基坑开挖对高速铁路路基的影响,具有重要的现实意义。结合某城市工程实际,研究某高速铁路附近锚桩防护方案基坑开挖对高速铁路路基的影响。分别采用ABAQUD软件进行数值模拟和对各施工阶段进行现场监测,对比分析锚桩防护方案基坑开挖引起的高速铁路的附加沉降量与横向水平位移。结果表明,高速铁路的附加沉降量与横向水平位移符合规范要求,锚桩防护方案切实可行,数值模拟结果与实测数据对应较好,可以较好的反映高速铁路的位移情况。

As the speed of the railway is fast and requires high smoothness of the track, the selection of reasonable foundation pit protection method can effectively reduce the influence of the excavation on the adjacent high-speed railway subgrade especially in soft soil region, which bears practical significance for civil engineering. This paper studies the influence of the foundation pit excavation on the adjacent high speed railway subgrade by comparing and analyzing the additional settlement and lateral horizontal displacement of the high speed railway caused by the excavation of the foundation pit by means of numerical simulation with finite software ABAQUS and field measurement. The results show that the additional settlement and horizontal displacement of high speed railway meet the requirements of the standard and the anchor pile protection scheme is applicable. The numerical simulation results are in agreement with the field measurements, reflecting the true displacement of high-speed railway.