平面变形超固结软黏土蠕变模型研究

发布时间：2018-03-12 14:23

本文选题：土力学　切入点：平面应变　出处：《岩石力学与工程学报》2016年11期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The creep characteristics of overconsolidated soft clay under plane deformation are studied by plane creep experiment of undisturbed soft soil. The results show that the developed measuring device can measure the lateral deformation of plane strain overconsolidated soft soil independently. It can avoid the influence of the measurement accuracy of volume deformation on the lateral deformation data. The lateral deformation of soft soil and the ratio of overconsolidated shear stress to OCR_q have a good corresponding relationship. OCR _ Q can reflect the influence of shear stress and stress history on lateral deformation of soft soil simultaneously. Volumetric creep coefficient and axial creep coefficient under plane strain state. Has a one-to-one correspondence with OCR_q, Based on the plane deformation creep experiments of overconsolidated soft soil under different principal stress ratios, a four-parameter empirical model with principal stress ratio and over-consolidated shear stress ratio as variables is established. The established empirical model includes the normal consolidation state of soft soil. The effect of principal stress ratio and stress history on the creep process of plane deformation soft soil can be reasonably reflected.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学道路与铁道工程科学研究所;河海大学岩土工程科学研究所;香港理工大学土木及工程结构系;
【基金】：国家自然科学基金资助项目(41272327) 江苏省自然科学基金项目(BK2011747) 高校业务费专项(2014B04914)~~
【分类号】：TU447

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