加荷模式对海积软黏土结构损伤性状的影响分析

发布时间：2018-04-11 06:03

本文选题：软黏土 + 加荷模式　；参考：《岩土力学》2014年07期

【摘要】：以天津海积软黏土为研究对象,对原状土及重塑土进行了不同固结压力、应力路径、加荷速率、排水条件下的三轴剪切试验,以应力比结构性参数与应变的关系来描述结构性衰减,研究了不同加荷模式下的结构损伤特性。结果表明,固结压力小于结构屈服应力时,剪切阶段的初始结构性和损伤速率基本不受固结压力影响,固结压力大于结构屈服应力时,初始结构性和损伤速率则随固结压力的增大而减小;在0??/2、??3?/2区间内,损伤速率随着应力路径方向角?的增加而增加,在?/2??、3?/2?2?区间内,损伤速率随着?的增加而减小,在每个?/2区间内,初始结构性随着?的增加先减小后增大;初始结构性和结构损伤速率随着加荷速率的增大而增大;排水剪切时的初始结构性和结构损伤速率都要比不排水剪时大。
[Abstract]:Tianjin marine soft clay as the research object, the influence of consolidation pressure on the undisturbed soil and remolded soil, stress path, loading rate, the three axle shear test under the condition of drainage, the stress ratio between the structural parameters and strain to describe structural attenuation, studied the structure damage characteristics of different loading modes. The results show that the consolidation pressure is less than the structure yield stress, shear rate and initial structural damage stage is hardly affected by the influence of consolidation pressure, consolidation pressure is greater than the yield stress, and the initial structural damage rate increases with consolidation pressure decreases; in 0?? /2?? 3? /2 range the damage rate, along with the stress path direction angle increases, in?? /2?? /2, 3?? 2? Range, with the injury rate? Decreases in each interval of /2?, with the increase of initial structural? Decreased first and then increased; the initial structural The damage rate of the structure increases with the increase of loading rate, and the initial structural and structural damage rates of the drainage shear are larger than that of the undrained shear.

【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;天津城建大学土木工程学院;
【基金】：国家自然科学基金项目(No.51179186) 湖北省自然科学基金创新群体项目(No.2011CDA124)
【分类号】：TU447

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