循环荷载下加固土体孔压的模糊正交试验分析  

Fuzzy Orthogonal Analysis on Pore Water Pressure of Reinforced Soft Clay Under Cyclic Loads

作　　者：闫春岭[1,2] 唐益群[1,2] 王元东[1,2] 李仁杰[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《吉林大学学报（地球科学版）》2011年第3期805-811,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40872178);上海市重点学科建设项目(B308)

摘　　要：针对地铁循环荷载下加固软粘土的孔隙水压力发展规律,对上海地铁4号线宝山-海伦引导段隧道周围的加固软黏土进行室内GDS循环三轴试验。结合重复正交设计法安排试验,借助模糊数学的理论与方法处理试验数据,充分考虑了振动频率(0.5、1.5、2.5 Hz)、动应力幅值(20、30、40 kPa)、固结比(1、1.4、2)以及超固结比(1、1.5、2)对土体孔隙水压力的影响。研究结果表明:振动频率、动应力幅值、固结比及超固结比对加固软黏土孔隙水压力的影响率分别为0.722、15.821、0.944及6.628;这说明影响加固软粘土孔隙水压力变化的主要因素是动应力幅值及超固结比,而固结比和振动频率的影响不显著。Through cyclic triaxial tests for the reinforced soft clay around the tunnel of Baoshan-Hailun station of Shanghai No.4 subway line,the analysis of pore water pressure was made on the reinforced soft clay under subway train loads.The experiments were arranged by orthogonal and repeated design and the factors which had the influence on the pore water pressure were fully considered,including vibration frequency（0.5,1.5,2.5 Hz）,amplitude of dynamic stress（20,30,40 kPa）,consolidation ratio（1,1.4,2） and over consolidation ratio（1,1.5,2）.The test data were processed though the fuzzy theory and the fuzzy method to analyze the influence rate of pore water pressure.The result shows the influence rate of pore water pressure on vibration frequency,amplitude of dynamic stress,consolidation ratio and over consolidation ratio is 0.722,15.821,0.944 and 6.628 respectively.Main factors which affect the change of pore water pressure are amplitude of dynamic stress and over consolidation ratio.Consolidation ratio and vibration frequency are not significant.

关 键 词：循环荷载 孔隙水压力 土动力学 动力测试系统 

分 类 号：TU411.8[建筑科学—岩土工程]