冻融循环下粉砂土屈服及强度特性的试验研究

doi:10.13722/j.cnki.jrme.2014.1643

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摘要为研究冻融循环对青藏粉砂土屈服及强度特性的影响，进行环境冷却温度－5 ℃、室温下融化，不同冻融循环次数及围压下的饱和粉砂土的固结排水三轴剪切试验。结果表明：粉砂土在整个剪切过程中呈现出剪缩的特性，且其应力–应变关系为应变硬化型，冻融循环未改变粉砂土的应力–应变及体变型式。未冻融粉砂土的体积屈服面和剪切屈服面可分别用椭圆型曲线和过原点的线性函数进行描述。冻融循环未改变粉砂土屈服面的形状，且冻融粉砂的体积屈服函数及剪切函数与塑性应变和冻融循环次数的关系可用相应的幂函数形式进行表示。其抗剪强度随着法向应力的增大而增大，随着冻融循环次数呈现出先降低后升高的趋势。冻融循环后，粉砂的黏聚力由4.82 kPa降至2.07 kPa，而内摩擦角则由27.11°最低降至22.93°。根据不同冻融循环次数下粉砂强度随法向应力的变化规律，指出可用线性莫尔–库仑准则来描述其强度特性。

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关键词 ：土力学, 粉砂土, 冻融循环, 屈服面, 莫尔&ndash, 库仑准则

Abstract：In order to study the influence of freezing-thawing cycles on the yielding and strength properties of silty sand from Qinghai—Tibet，the consolidated drained triaxial shear tests under different confining pressures and freezing-thawing cycles were conducted. The freezing temperature was chosen to be －5 ℃ during freezing- thawing cycles. It was found that the silty sand exhibited shear contraction and strain hardening during shearing. The types of volumetric curves and stress-strain curves were not changed after freezing-thawing cycles. The volumetric yield surface of unfrozen silty sand was expressed with an elliptic curve，while the yield surface for shearing was represented with a linear function passing the origin. The shapes of both volumetric yield surface and shear yield surface were not changed after freezing-thawing cycles. Both the volumetric yield function and the shear yield function were expressed as the power function of the plastic strain and numbers of freezing-thawing cycles. The shear strength of silty sand increased with the increasing of the normal stress，but decreased and then rised with increasing the number of freezing-thawing cycles. The cohesion of the silty sand was changed from 4.82 kPa to 2.07 kPa and the angle of internal friction was varied from 27.11°to 22.93°after freezing-thawing cycles. The linear Mohr-Coulomb criterion was adopted to describe the strength properties according to the strength variation of silty sand to the normal stress under freezing-thawing cycles.

Key words： soil mechanics silty sand freezing-thawing cycle yield surface Mohr-Coulomb criterion

引用本文:

常丹1，刘建坤1，李旭1，2. 冻融循环下粉砂土屈服及强度特性的试验研究[J]. 岩石力学与工程学报, 2015, 34(08): 1721-1728.
CHANG Dan1，LIU Jiankun1，LI Xu1，2. EXPERIMENTAL STUDY ON YIELDING AND STRENGTH PROPERIES OF SILTY SAND UNDER FREEZING-THAWING CYCLES. , 2015, 34(08): 1721-1728.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1643 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/I08/1721

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