摘要
为研究循环荷载作用后原状土与重塑土不排水强度发展规律,针对天津典型粉质黏土做了一系列动、静力三轴试验。结果表明,振后原状土样不排水抗剪强度会发生衰减,当振后轴向应变大于3%时,衰减度β随动轴向应变增加呈现先增大后稳定的趋势;最大孔压比处于0.5～0.7之间时,不排水强度衰减较小,最大孔压比高于0.7时,振后强度开始迅速衰减;振后饱和粉质黏土不排水剪应力路径表现出超固结性质,随着β的增加,应力路径由正常固结向轻似超固结,再向重似超固结发展。对于重塑土,循环荷载作用后其不排水抗剪强度变化较小。
Dynamic and static triaxial tests are carried out to study the patterns of undrained strength development of undisturbed and remolded clay after cyclic loading.The results show that the undrained strength of undisturbed saturated clay can degrade after cyclic loading,when the dynamic axial strain is higher than 3%,the reduction factor increases firstly and then keeps steady;the reduction factor keeps at low level when the ultimate pore pressure ratio stays at 0.5 to 0.7,and it will rise rapidly if it is higher than 0.7;and with the increase of the reduction factor β,the stress paths transform from normal consolidation to lightly quasi-overconsolidation,then to heavily quasi-overconsolidation.The strength of remolded saturated soft clay hardly changes after cyclic loading.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2012年第3期400-408,共9页
Chinese Journal of Geotechnical Engineering
基金
国家重点基础研究发展计划(973计划)项目(2010CB732106)
国家自然科学基金项目(51078262)
天津大学自主创新基金项目(2010XJ-0101)
作者简介
郑刚（1967-），男，教授，博士生导师，从事土力学及岩土工程的教学与研究。E．mail：zhengzige2004@yahoo．tom．cn。
