柴达木盆地雅丹地区场地特征及铁路路基施工影响

The Site Characteristics of Yardang Area and Influence of Railway Roadbed Construction in Qaidam Basin

基于对青海省地方铁路鱼卡（红柳）至一里坪铁路通过的雅丹地貌分布区的现场调查,将该区域雅丹按形态及沉积特征进行了分类。利用高密度面波勘探,得到了铁路通过该雅丹密集分布区典型工程场地的浅层（0~30m）地下结构分布,综合考虑剪切波速和覆盖层厚度分布测试结果,该区域场地的建筑场地类别为II类场地。进而通过对该场地的主要铁路路基施工方式的现场强震动测试,得到了路基碾压施工的振（震）动加速度衰减规律以及路基碾压施工对雅丹影响的安全避让距离为距离震源33m。

Based on the site investigation of Yardang area where the new local railway of Yuqia（Hongliu）to Yiliping in Qinghai Province passes through,a classification of the Yardangarea has been made in terms of their forms and sediment characteristics in the area.Using high-density surface wave exploration,the shallow（0~30m）underground structure distribution has been obtained.The area of construction site is classified as class II by considering survey results of shear wave velocity and thickness of overburden distribution.Moreover,through strong vibration test of main type of railway embankment construction,the vibration attenuation laws of acceleration of compacted embankment and the safe distance not to exert the influence of compacted embankment construction on Yardang has been obtained,and the safe distance is 33 mfrom the vibration source.