江苏长江以南地区新近沉积土动剪切试验研究  

A Study on Dynamic Shear of Recently Deposited Soils for Southern Jiangsu Province along Yangtze River

作　　者：陈国兴[1] 刘雪珠[1] 朱定华[1] 王炳辉[1] 胡庆兴[1] 

机构地区：[1]南京工业大学岩土工程研究所,南京210009

出　　处：《地下空间与工程学报》2007年第4期745-750,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(50578076);江苏省自然科学重点项目(BK20006702B);江苏省六大人才高峰计划资助项目(06-F-008)

摘　　要：江苏长江以南地区指南京、苏州、无锡、常州和镇江等行政区域,在长江沿江经济发展及城市一体化战略中发挥着重要作用。根据土的区域性、沉积环境的相似性,通过对江苏长江以南地区六类新近沉积土378个原状土样、历时6年的试验研究,基于Martin-Davidenk-ov模型和作者提出的阻尼比经验公式,给出了这六类新近沉积土的动剪切模量比G/Gmax和阻尼比D与剪应变幅值γ的关系曲线及模型参数;试验结果表明具有结构性的粉质粘土与粉细砂互层土、砂土具有独特的动力特性。这些成果已应用于该地区跨江大桥、轨道交通和电力设施等重大工程场地的地震安全性评价工作;同时,该成果有利于加深对江苏长江以南地区新近沉积土动力特性的认识。Nanjing, Suzhou, Wuxi, Changzhou and Zhenjiang cities located on the southem region of Jiangsu province along Yangtze River, China, play a key role in the integration strategy of economic development and interurban cooperation of the Coastal areas in China. Considering the regional character and similarity of depositional environment of soils, this paper analyzes the test results of free vibration column apparatus on about 378 undisturbed samples of recently deposited soils in this region, including mucky silty clay, clay, silty clay, silty clay and silty sand interbedded strata, silt and sand soils, during last six years. The fitting curves of average relation between dynamic shear modulus ratio G/Gmax and damping ratio D versus shear strain amplitude γ and their parameters on the empirical formula of G/Gmax-γ curve based on Martin - Davidenkov model and the empirical formula of D-γ curve recommended by the authors in this paper for 6 types of soils mentioned above are presented. These results have been applied in the evaluation of seismic safety for engineering sites in this area, such as across Yangtze River bridges, orhit transportation and electric establishments etc. Especially, because of particular structural characteristics of silty sand interbedded strata and sand soils in this region, their dynamic property distinguishes with that of general soils in this study. Furthermore, the results in this paper will make us understand more about dynamic characteristics of recently deposited soils in this area.

关 键 词：新近沉积土 江苏长江以南地区 动剪切模量比 阻尼比 自振柱试验 

分 类 号：TU411.3[建筑科学—岩土工程]