随机地震荷载作用下高速铁路黄土路基震陷试验分析  

LABORATORY ANALYSIS OF SEISMIC SUBSIDENCE OF LOESS SUBGRADE OF HIGH-SPEED RAILWAY UNDER RANDOM SEISMIC LOADING

作　　者：王峻[1,2,3] 王谦[1,2,3] 王兰民[1,2,3] 王平[1,2,3] 柴少峰[1,2,3] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局黄土地震工程重点实验室,甘肃兰州730000 [3]甘肃省岩土防灾工程技术研究中心,甘肃兰州730070

出　　处：《岩石力学与工程学报》2014年第A02期4239-4245,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国地震局兰州地震研究所地震科技发展基金(2012S01);国家自然科学基金资助项目(50978239);甘肃省科技计划资助项目(1308RJZA153)

摘　　要：通过将郑西客运专线不同地段地震危险性分析中人工合成的地震波直接输入动三轴,对该客运专线不同地段原状黄土试样进行震陷试验,研究黄土在随机地震荷载作用下的震陷特性。根据震陷试验结果,利用黄土震陷试验预测方法对该客运专线黄土路基在未来地震中是否发生震陷进行判断,分别给出50 a超越概率10%和2%的震陷量预测结果。试验结果表明,HYCD,TGCD,LBCD三个场地的土属于震陷性黄土,震陷临界动应力在70 k Pa左右,这些场地应根据黄土震陷量的大小,采取合理、有效的地基抗震措施;而YSCD场地的土属于非震陷性黄土。研究区黄土在中、强地震作用下,震陷主要发生在Q3地层中。In this paper,through the synthetic random seismic wave of seismic risk analysis in different sections of a passenger dedicated line was input dynamic triaxial apparatus, and taken seismic subsidence experiments on undisturbed loess for samples. The seismic subsidence characteristics of the undisturbed loess in different sections of the passenger dedicated line are studied. According to the seismic subsidence test results, prediction method based on loess seismic subsidence test is used to judge whether loess seismic subsidence will occurred on the loess subgrade of passenger dedicated lines in future earthquake. Moreover,the prediction results of 50 years beyond the probability of 10% and 2% are provided respectively. The results show that the loess in HYCD,TGCD and LBCD sites belongs to seismic subsidence loess. The critical dynamic stress for seismic subsidence is about 70 k Pa. The reasonable and effective foundation seismic measures should be taken,based on the size of the amount of loess seismic subsidence. While the loess from YSCD site belongs to non-seismic subsidence loess. Loess seismicsubsidence in the research area mainly occurred in the Q3 loess when moderate and strong earthquake occurred.

关 键 词：土力学 原状黄土 震陷 随机地震荷载 动三轴试验 评价 

分 类 号：TU44[建筑科学—岩土工程]