交通荷载作用下厚层老黏土动力特性研究
摘要:京张高铁经过官厅地区时,长期交通循环动荷载作用下可能使厚层老黏土产生变形,从而对高铁安全运行造成影响。针对该问题,利用GDS动态三轴仪,考虑动频率、动应力幅值及固结应力等因素,对官厅厚层老黏土开展土动力特性试验。试验结果表明:官厅地区厚层老黏土强度比一般淤泥质土高;相同固结应力下土体所受动应力比越高,动应变发展越大;同一层土在相同动应力比加载条件下,低频荷载较高频对动应变影响更明显;相同动应力比、相同频率、不同固结应力作用下动应变发展曲线分为破坏型、临界型与稳定型;固结应力大的土体更不易产生动应变,应变达到稳定速率越快。研究成果对交通循环荷载作用下老黏土动力学特性的研究具有参考价值,为高铁沉降控制提供依据。
Abstract:When Beijing-Zhangjiakou high-speed railway pass through the Guanting area, under the long-term traffic cyclic dynamic loading, the deep old cohesive soil will be deformed, which may affect the safety of high-speed railway operation. Focusing on this problem, GDS dynamic triaxial apparatus was used to study the dynamic characteristics of Guanting deep old cohesive soil, considering dynamic frequency, dynamic stress amplitude and consolidation stress. The results show that the strength of Guanting deep old cohesive soil is higher than that of ordinary mucky soil. For the same consolidation stress, the higher the dynamic stress ratio is, the greater development the dynamic strain is. The effect of low frequency load on dynamic strain is more obvious than the high frequency for the same layer. Under the same dynamic stress ratio, same frequency and different consolidation stress, the dynamic strain curves are divided into failure type, critical type and stable type. Soil with higher consolidation stress is more difficult to produce dynamic strain, and the less vibration required to reach stability. The research conclusions have reference value for the study of dynamic characteristics of deep old cohesive soil under traffic cyclic loading, and provide a reference for the settlement control of high-speed railway.
中文标题：
交通荷载作用下厚层老黏土动力特性研究
Dynamic Characteristics of Deep Old Cohesive Soil under the Influence of Traffic Load
作者：
张树轩1,陈立伟1,杨为民2,司海宝3
Zhang Shuxuan1,Chen Liwei1,Yang Weimin2,Si Haibao3
作者简介:张树轩,男,1993年生,北京人,硕士研究生,助理工程师,主要从事岩土工程、工程地质、地质灾害等方面的研究。E-mail:zhangsx0209@sina.com
通讯地址：
1. 中国核电工程有限公司, 北京 100840; 2. 中国地质科学院地质力学研究所, 北京 100081; 3. 安徽工业大学, 安徽马鞍山 243000
1.ChinaNuclearPowerEngineeringCo.,Ltd.,Beijing100840,China; 2.InstituteofGeomechanics,ChineseAcademyofGeologicalSciences,Beijing100081,China; 3.AnhuiUniversityofTechnology,Maanshan243000,Anhui,China
中图分类号:TU411.8
doi:10.3969/j.issn.1007-2993.2020.05.011
出版物：岩土工程技术
收稿日期:2019-08-13
网络出版日期:2021-07-06
关键词:交通荷载,老黏土,加载频率,动应力,固结应力
Key words:traffic load,old cohesive soil,loading frequency,dynamic stress,consolidation stress
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