南水北调与水利科技
南水北調與水利科技
남수북조여수리과기
SOUTH-TO-NORTH WATER
2014年
5期
6-10,17
,共6页
唐皓%赵法锁%段钊%宋飞
唐皓%趙法鎖%段釗%宋飛
당호%조법쇄%단쇠%송비
Q 2 黄土%蠕变试验%含水率%流变%非线性%损伤%模型
Q 2 黃土%蠕變試驗%含水率%流變%非線性%損傷%模型
Q 2 황토%연변시험%함수솔%류변%비선성%손상%모형
Q2 loess%creep experiment%moisture content%rheology%nonlinear%damage%model
对 Q2黄土进行不同含水状态下的三轴蠕变试验，结果表明，随着含水率的增高， Q2黄土的流变性能增强。根据试验曲线形态特征，选用一个广义 Kelvin 模型串联一个非线性黏塑元件组成非线性黏弹塑性模型(改进的西原模型)。应用改进的西原模型对试验数据进行拟合求参，结果显示瞬时变形模量 EH 、黏弹性变形模量 EK 、黏弹性黏滞系数 GK 随含水率增加呈指数形式递减。引入含水损伤变量 D( X)，计算得出各蠕变参数含水损伤演化方程，进而建立考虑含水损伤的非线性蠕变模型。应用试验数据对其进行验证，证明考虑含水损伤的非线性蠕变模型能够有效的描述 Q2黄土的整体流变特征。
對 Q2黃土進行不同含水狀態下的三軸蠕變試驗，結果錶明，隨著含水率的增高， Q2黃土的流變性能增彊。根據試驗麯線形態特徵，選用一箇廣義 Kelvin 模型串聯一箇非線性黏塑元件組成非線性黏彈塑性模型(改進的西原模型)。應用改進的西原模型對試驗數據進行擬閤求參，結果顯示瞬時變形模量 EH 、黏彈性變形模量 EK 、黏彈性黏滯繫數 GK 隨含水率增加呈指數形式遞減。引入含水損傷變量 D( X)，計算得齣各蠕變參數含水損傷縯化方程，進而建立攷慮含水損傷的非線性蠕變模型。應用試驗數據對其進行驗證，證明攷慮含水損傷的非線性蠕變模型能夠有效的描述 Q2黃土的整體流變特徵。
대 Q2황토진행불동함수상태하적삼축연변시험，결과표명，수착함수솔적증고， Q2황토적류변성능증강。근거시험곡선형태특정，선용일개엄의 Kelvin 모형천련일개비선성점소원건조성비선성점탄소성모형(개진적서원모형)。응용개진적서원모형대시험수거진행의합구삼，결과현시순시변형모량 EH 、점탄성변형모량 EK 、점탄성점체계수 GK 수함수솔증가정지수형식체감。인입함수손상변량 D( X)，계산득출각연변삼수함수손상연화방정，진이건립고필함수손상적비선성연변모형。응용시험수거대기진행험증，증명고필함수손상적비선성연변모형능구유효적묘술 Q2황토적정체류변특정。
Triaxial creep experiments w ere performed on Q2 loess with different moisture contents. The experimental results show ed t hat the rheological properties of Q2 loess strengthen with the increasing of moisture content. According to the experi-mental curve shape charact eristics, the nonlinear viscoelastoplastic model (improved Nishihara model) w as constituted by con-necting a generalized Kelvin model with a nonlinear viscoplastic body in series. T he improved Nishihara model w as used to fit the test data and analyze the model parameters, w hich suggested that instantaneous deformat ion modulus (EH), viscoelastic modulus (EK), and viscoelastic coefficient of viscosity (GK)decrease in the exponential form with the increasing of moisture content. The water damage parameter D(X) was int roduced to derive the damage evolution equation of each creep paramet er, and the nonlinear viscoelastoplastic model with water damage effect was established. The experimental data w ere used to verify the model, and t he results suggested that the nonlinear creep model considering w ater damage can characterize the overall rheo-logical properties of Q2 loess effectively.
