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通过对原状软土进行平面蠕变实验,研究平面变形条件下超固结软黏土的蠕变特征。研究结果表明,研制的量测装置能独立量测平面应变超固结软土的侧向变形,可规避实验过程体积变形测量精度对侧向变形数据的影响;软土的侧向变形与超固结剪应力比OCR_q具有良好的对应关系,OCR_q能同时反映剪应力和应力历史对软土侧向变形的影响。平面应变状态下体积蠕变系数和轴向蠕变系数均与OCR_q有一一对应关系,依据不同主应力比下的超固结软土平面变形蠕变实验,建立以主应力比和超固结剪应力比为变量的四参数经验模型。所建经验模型包含软土的正常固结状态,可合理反映了主应力比和应力历史对平面变形软土蠕变过程的影响。
The creep characteristics of overconsolidated soft clay under plane deformation were studied by plane creep test of undisturbed soft soil. The results show that the developed measuring device can independently measure the lateral deformation of the plane strain overconsolidated soft soil, and can avoid the influence of the measurement accuracy of the volume deformation on the lateral deformation data during the experiment. The lateral deformation and overrun of the soft soil The shear stress has a good correspondence with OCR_q. OCR_q can simultaneously reflect the influence of shear stress and stress history on the lateral deformation of soft soil. The volume creep coefficient and axial creep coefficient in plane strain state have one-to-one correspondence with OCR_q. According to the plane deformation creep experiment of overconsolidated soft soil under different principal stress ratio, the principal stress ratio and overconsolidation Shear stress ratio is a four parameter empirical model. The built empirical model contains the normal consolidation state of soft soil, which can reasonably reflect the influence of principal stress ratio and stress history on the creep process of flat deformed soft soil.