低频循环荷载下饱和软土的动力特性研究-土木工程（岩土工程）专业毕业论文.docx

广东工业大学硕士学位论文
1+10(c—N)+D+J+E
(3)动弹性模量与固结比k的关系式:
fC+Kr}D1
Ed=(A+Kc木B)￡r.。
关键词:循环荷载;淤泥质软黏土;动孔压;累积塑性应变;滞回圈;动弹性模
量;抗剪强度;微观结构;
II
万方数据
ABSTF{ACT
ABSTRACT
As amount of subway and highway were built in southeast China,the problems of deformation properties and stability of soft soil roadbed are the mechanical response of soft soil under traffic loading are the prerequisites of design and construction.
The prirvious researches are summaryed and the test is based on SPAX-2000 static and dynamic true triaxial testing system(improved).Here are the test parameters:loading ffequencys are Hz,, and 1 stresses are 20kPa,50kPa and 65kPa. Consolidation stresses areol’=-02’=-03’=200kPa,01’-'-02’_225kPa and 03’=200kPa,
01’=G2’=250kPa and 03’= content and main results are as follows:
influence of loading frequency is shown as frequency are the key factor of development of pore water pressure,accumulative plastic strain and hysteresis loops,but not the dynamic elastic the same cyclic stress and consolidation stress, the pore water pressure and accumulative plastic strain decreased as the increasing of loding reduction of pore water pressure and accumulative plastic strain of are over 57%and 77%than that of .
influence of cyclic stress is shown as stress are the key influencing factor of development of pore water pressure,accumulative plastic strain and hysteresis loops,but not the dynamic elastic the same dynamic frequency and concolidation stress,the pore water pressure and accumulative plastic strain decreased as the increasing of cyclic increase ofpore water pressure and accumulative plastic
strain of 20kPa are over 233%and 1 03%than that of 50kPa.
influence of consolidation is shown as stress are the key influencing factore for dynamic elastic modulus,but not the pore water pressure and accum