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试验资料表明:饱和黏土在不排水常载升温条件下会产生很大的变形并最终可发生热破坏现象,因此,升温也成为一种加载方式。基于姚仰平等提出的热UH临界状态模型,推导了受温度影响的热不排水抗剪强度表达式,对不同超固结度饱和黏土在升温下的不排水抗剪强度模拟与试验结果对比表明:所提公式能够合理反映试验资料中受温度影响的不排水抗剪强度变化规律。利用热UH模型对不排水常载-升温过程进行了模拟,模拟结果表明,热UH模型可合理地反映不排水常载-升温条件下饱和黏土的应力-应变关系以及强度变化规律。针对能影响热破坏过程的几种因素如升温初始时的偏应力比、升温幅度、超固结度以及先期固结压力等进行了讨论分析,得到了各因素对于饱和黏土不排水剪切下的应力-应变关系及强度特性的影响规律。
The experimental data show that saturated clay will produce great deformation under the conditions of normal undrained loading and eventually thermal destruction, so heating up also becomes a kind of loading method. Based on the hot UH critical state model proposed by Yao Yang et al., The expression of undrained thermal shear strength under the influence of temperature is deduced. The comparison between undrained shear strength simulation and experimental results of different super-consolidated saturated clays at elevated temperature : The formula can reasonably reflect the temperature-dependent variation of undrained shear strength in the test data. The hot UH model is used to simulate the undrained load-rising process. The simulation results show that the hot UH model can reasonably reflect the stress-strain relationship and the strength variation law of saturated clays under undrained load-raise conditions. According to several factors that can affect the thermal destruction process, such as the deviatoric stress ratio, the temperature rise range, the over-consolidation degree and the pre-consolidation pressure at the initial stage of heating, the factors that affect the thermal destruction process are discussed. Stress - strain relationship and strength characteristics of the law.