CAJ | 학술논문

针对广西上林县原状红黏土开展一系列循环加载动三轴试验，分析天然含水率、围压与固结应力比等对红黏土动力特性，包话动应力-动应变关系、动弹性模量以及阻尼比等的影响来研究循环荷载作用下红黏土的动力特性。试验结果表明：广西原状红黏土动应力-动应变关系曲线接近双曲线；由于初始剪应力的影响，达到相同的动应变，在均压固结下所需的动应力比在偏压固结下所需动应力要小；动弹性模量随着动应变的增加而减小，且减小幅度随应变增加逐渐减小，初始应力状态对动弹性模量的影响最为显著；固结应力比、围压、含水率和振动次数等对阻尼比均有影响，综合反映在阻尼比随动应变增加而减小，阻尼比离散性较大，取值范围在0.05~0.20之间。利用Konder 双曲线模型对试验数据进行拟合，得到相关参数，可为广西地区原状红黏土动力特性设计和数值计算提供一定的理论和参数支持。
침대엄서상림현원상홍점토개전일계렬순배가재동삼축시험，분석천연함수솔、위압여고결응력비등대홍점토동력특성，포화동응력-동응변관계、동탄성모량이급조니비등적영향래연구순배하재작용하홍점토적동력특성。시험결과표명：엄서원상홍점토동응력-동응변관계곡선접근쌍곡선；유우초시전응력적영향，체도상동적동응변，재균압고결하소수적동응력비재편압고결하소수동응력요소；동탄성모량수착동응변적증가이감소，차감소폭도수응변증가축점감소，초시응력상태대동탄성모량적영향최위현저；고결응력비、위압、함수솔화진동차수등대조니비균유영향，종합반영재조니비수동응변증가이감소，조니비리산성교대，취치범위재0.05~0.20지간。이용Konder 쌍곡선모형대시험수거진행의합，득도상관삼수，가위엄서지구원상홍점토동력특성설계화수치계산제공일정적이론화삼수지지。
In order to study the dynamic properties of red clay under cyclic loading conditions,a series of cyclic triaxial tests are carried out on undisturbed red clay obtained from Shanglin coun-ty,Guangxi.The impacts of water content,confining pressure,and consolidation stress ratio on the dynamic properties of red clay such as the dynamic stress-strain relationship,dynamic elastic modulus,and damping ratio are analyzed.It is indicated from the test results that the stress-strain curve of red clay from Guangxi is close to a hypobolic style;due to the effects of the initial shear stress,a higher dynamic stress is needed to obtain the same strain under anisotropic consolidation as under isotropic consolidation;the dynamic modulus decreases as the dynamic strain increases;the decrease in amplitude decreases with the increase of the dynamic strain;and the initial stress state has the most significant impact on the dynamic elastic modulus.The damping ratio is affected by the consolidation stress ratio,confining pressure,and water content of red clay from Guangxi,and it increases as the dynamic strain increases,with its value distributed between 0.1 and 0.2.The damping ratio data has a high discreteness.Based on the hyperbolic model by Konder, test data are fitted,and relevant parameters are obtained.This research could be a reference for further design of dynamic properties and numerical calculation,and it also provides relevant pa-rameters.