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基于颗粒流的富水岩石冻融后拉伸力学行为研究 被引量:6

Particle Flow-based Investigation on the Tensile Behaviours of Rock after Freeze-thaw Treatment
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摘要 为了研究岩石冻融作用下的拉伸力学行为,提出基于孔隙水颗粒和颗粒膨胀的方法模拟岩石孔隙水低温相变膨胀过程,推导得到了孔隙水颗粒体积与温度和未冻水含量的关系方程。然后,采用提出的新方法开展了富水岩石冻融循环和冻融后巴西劈裂数值计算,通过与室内试验结果对比验证了提出的岩石冻融颗粒流方法的可行性和可靠性。计算结果表明:冻融循环过程中圆盘内的裂隙容易在圆盘表面聚集;冻融循环次数较少时,劈裂试验中圆盘内裂隙主要集中在中心线附近,冻融循环次数较大时,在远离圆盘中心线位置会产生大量裂隙;冻融循环和劈裂试验中,试样的拉伸破坏率均远大于剪切破坏率。 Phase transformation and volume expansion of pore water at low temperature are the main reasons of the frost heaving damage in rock.The tensile strength of rock after freeze-thaw cycles is worthier of attention than the compressive strength.To investigate the mechanics of rock under tensile stress,this work proposed an approach based on the concepts of pore water particle and volume expansion to simulate the processes of phase transformation and frost heave of pore water at low temperature.The equation for expressing the relationship between the volume of pore water particle,temperature,and unfrozen water content was derived.Then,the new proposed approach was used to carry out the simulation of freeze-thaw cycles on water rich rock samples.The feasibility and reliability of the new proposed approach were verified by comparing the simulated results with the laboratory test results.Simulated results indicate that cracks inside the disc formed during the process of freeze-thaw cycles tend to gather near the surface.When the number of freeze-thaw cycles is small,the cracks inside the disc formed during the splitting test are mainly concentrated near the center line of the disc,while a large number of cracks will be generated far from the center line of the disc when the number of freeze-thaw cycles is large.The tensile failure rate is much higher than the shear failure rate in both the processes of freeze-thaw and Brazil splitting test.
作者 董方方 朱谭谭 屈子健 DONG Fangfang;ZHU Tantan;QU Zijian(School of Highway,Chang’an University,Xi’an,Shanxi 710064,China)
出处 《河北工程大学学报(自然科学版)》 CAS 2021年第3期22-29,共8页 Journal of Hebei University of Engineering:Natural Science Edition
基金 陕西省自然科学基础研究计划资助项目(2021JQ-270) 长安大学中央高校基本科研业务费专项(300102211801)。
关键词 孔隙水颗粒 体积膨胀 富水岩石 冻融循环 巴西劈裂 pore water-particle volume expansion water rich rock freeze-thaw cycle Brazilian splitting test
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