应变控制下水泥土动静力特性试验

为了研究循环荷载下水泥土的动静力特性,通过GDS振动三轴仪进行应变控制下的静力和逐级循环加载试验.静力试验表明:应变速率越大,水泥土强度越大,应变速率为5%时的峰值应力相对于being0.05%时提高了47.57%;掺入比决定水泥土应力-应变关系曲线的软化或硬化型式.通过逐级循环加载试验,进一步分析水泥土的应力-应变关系和动模量的发展规律,通过对双曲线模型的修正,建立描述水泥土应力-应变关系的经验模型.该模型共有3个参数,论述了各个参数的物理意义和确定方法,结果表明,本文模型简单实用,能够较好地反映水泥土的应力-应变关系.

Experimental research on static and dynamic characteristics of cement soil under strain control

Static and gradually increasing cyclic loading tests under strain control were investigated by GDS dynamic triaxial system in order to analyze the static and dynamic characteristics of cement soil. Static test results show that the strength of cement soil increases with the strain rate increases. The peak stress increases 47.57% when the strain rate being 5% compared to being 0.05%. The cement mixing ratio determines the stress strain relationship to be softening type or hardening type. The stress strain relationship and the development law of dynamic modulus were analyzed. The empirical model of stress strain relationship was conducted by modifying the hyperbolic model. The model had three parameters. The physical meaning and the determination method were discussed. Results show that the model is simple and practical, which can well reflect the stress strain relationship of cement soil.