青岛胶州湾软土的物理力学性质分析  

Mechanical Properties of Soft Clay in Jiaozhou Bay

作　　者：郭彦雪[1,2] 李大勇[1,2] 冯磊[1,2] 

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木建筑学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2013年第4期45-51,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51078227);山东省自然科学基金项目(ZR2009FM003);教育部留学回国人员科研启动基金项目;山东科技大学研究生科技创新基金项目(YCB120127)

摘　　要：以胶州湾营旧高速公路软土地基为研究对象,选取沿线有代表性地段软土,进行室内土工试验,对其力学参数进行分析,为胶州湾地区工程设计与施工提供依据。与我国南方地区代表性软土的物理力学特性进行对比,发现胶州湾地区软土具有相对密度大、孔隙比小、含水率低、液性指数低等特点;通过直剪实验得出胶州湾软土的抗剪强度指标c值在5～15kPa范围内(均值为9kPa)、φ值在1°～8°范围内(均值取5°),且与c相比,φ值受含水率影响较大;动三轴试验发现动应变εd是影响动剪切模量比和阻尼比的主要因素。Laboratory soil tests were conducted on representative soil samples collected from the jiaozhou Bay to study its mechanical properties,with the physical and mechanical parameters determined. Compared with the repre- sentative soft clay in southern China, the soft clay of J iaozhou Bay has a larger relative density,lower porosity, lower water content and lower liquidity index. Through direct shear test,it is concluded that cohesion c is about 5 - 15 kPa with an average value of 9 kPa,and frictional angle φ is round 1°-8°with an average value of 5°. In addition,com- pared with c,the value of φ is influenced more seriously by water content. By the dynamic triaxial test, it is found that the dynamic strain εd is the principal factor influencing the dynamic shear modulus ratio and the damping ratio.

关 键 词：软土 力学特性 抗剪强度 动应变 

分 类 号：TU435[建筑科学—岩土工程]