CAJ | 학술논문

针对连云港地区淤泥质黏土颗粒细、渗透系数小的特点,研究了循环荷载作用下土体的软化规律,提出该类土体软化指标.通过三轴循环荷载试验,得到累积轴向应变值和轴向应变值随着循环应力幅值比和固结压力的增大而增大;土样中平均孔压比随着循环应力幅值比的增大而增大;循环荷载的周期越大累积轴向应变和平均孔压值越大;在循环荷载作用初期,变形模量的弱化随着循环应力幅值比和循环周数的增大而更加显著.对试验数据进行分析,得出在风暴潮的波浪循环荷载作用下,连云港地区淤泥质黏土的模量和强度折减系数在0.75~0.80之间.
침대련운항지구어니질점토과립세、삼투계수소적특점,연구료순배하재작용하토체적연화규률,제출해류토체연화지표.통과삼축순배하재시험,득도루적축향응변치화축향응변치수착순배응력폭치비화고결압력적증대이증대;토양중평균공압비수착순배응력폭치비적증대이증대;순배하재적주기월대루적축향응변화평균공압치월대;재순배하재작용초기,변형모량적약화수착순배응력폭치비화순배주수적증대이경가현저.대시험수거진행분석,득출재풍폭조적파랑순배하재작용하,련운항지구어니질점토적모량화강도절감계수재0.75~0.80지간.
According to the silt clay characteristics which is fine particles and a small coefficient of permeability in Lianyun-gang region, the soften law of the soil is studied and soil softening index is recommended under cyclic loading. Through triaxial cyclic loading test,the results are obtained, the accumulated axial strain and axial strain increase with the cyclic stress ampli-tude ratio and the consolidation pressure increasing, average pore pressure ratio in soil increases with the cyclic stress ampli-tude ration increasing, the accumulated axial strain and average pore pressure ratio increase with cyclic loading cycle increas-ing. Weakening in the early stage of cyclic loading, deformation modulus is more significant as the increase of the cyclic stress amplitude ratio and the cycle number in initial stage. Analysis of test data, it is derived that silt clay in the modulus and strength reduction factor between 0.75 and 0.80 in the Lianyungang when storm surge wave cyclic loading take place.