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在UH(Unified Hardening,统一硬化)模型的基础上,通过分析砂土特性,建立了砂土的本构模型。该模型具有以下几个特点:1通过引入压硬性参量,模型可以描述在e–lnp空间内砂土的等向压缩线为曲线的特性;2通过引入剪胀性参数,模型可以合理描述砂土的剪胀特性,即松砂的特征状态应力比较大,密砂的特征状态应力比较小的特性;3通过引入临界状态参数来建立砂土的水滴形屈服面,模型可以合理描述临界状态线(CSL)在e–lnp空间内的位置。相对于UH模型,本文所提的砂土模型只增加了3个材料参数,且3个参数都可通过室内常规试验确定。最后,利用该模型对砂土排水和不排水试验进行预测,预测结果与试验结果吻合很好。
Based on the UH (Unified Hardening) model, a constitutive model of sand is established by analyzing the characteristics of sand. The model has the following characteristics: 1 By introducing compressive hard parameters, the model can be used to describe the isotropic compression line of sand in the e-lnp space as the curve characteristic.2 By introducing the dilatancy parameters, the model can describe the sand The dilatancy characteristics of loose sand, that is, the characteristic stress of loose sand is relatively large and the characteristic stress of sand is relatively small. 3) By introducing the critical state parameters to establish the teardrop-shaped yield surface of sand, the model can reasonably describe the critical state line CSL) in the e-lnp space. Compared with the UH model, the sand model proposed in this paper only adds three material parameters, and all the three parameters can be determined by routine experiments indoors. Finally, the model is used to predict the drainage and undrained test of sand soil. The predicted results are in good agreement with the experimental results.