摘要
以郑(州)—西(安)高速铁路为例,选择潼关段为研究区,采集大量原状黄土样品,将合成的人工地震动输入到动三轴,进行了固结不排水的动三轴实验,估算了黄土路基的震陷量。建立了高速铁路黄土路基动力学数值模型,研究了50年10%和2%的超越概率水平的地震作用下黄土路基的永久变形,以及地基处理后黄土地基的永久变形。结果显示,沉降主要发生在Q3黄土中,强夯、DDC桩等地基处理措施可以有效的减少地基黄土的沉降变形,但是当处理深度不够时,在强地震作用下仍然可以产生较大沉降。研究成果为地基抗震处理提供了依据。
This paper is about the Zhengzhou -Xi＇an high- speed railway, in particular, the Tongguan section a- bout their potential seismic subsidence. A large number of undisturbed loess samples were collected at Tongguan section. By inputting artificial synthetic seismic wave to the dynamic triaxial testing of the samples, the seismic subsidence experiments were carried out. Based the laboratory tests, the paper obtains the following results. First- ly, the seismic subsidence of loess foundation was estimated and the foundation dynamic numerical model was es- tablished. Secondly, It further examined the permanent deformation of the sub -grade loess at the levels of 10% and 2% exceedance probability in 50 years under the earthquake effect and the sub - grade loess after soil treat- ment. The results showed that, the settlement occurred mainly in Q3 loess. The foundation treatment measures such as dynamic compaction, down - hole dynamic consolidation can effectively reduce the settlement of the loess foun- dation. However, larger settlement can still be generated under strong earthquakes if the soil treatment depth is not deep enough. The results presented in the paper can provide a basis for the foundation seismic treatment.
出处
《工程地质学报》
CSCD
北大核心
2009年第4期557-562,共6页
Journal of Engineering Geology
基金
国家自然科学基金(40572157)
铁道部重大科研项目(2005K001-A(G))
关键词
黄土震陷
路基沉降
数值分析
Loess, Seismic subsidence, Sub - grade deformation, Seismic treatment, Railway
