| 小应变条件下应力路径旋转对剪切模量影响 |
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| 引用本文： | 张培森.小应变条件下应力路径旋转对剪切模量影响[J].岩土力学,2009,30(3):820-824. |
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| 作者姓名： | 张培森 |
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| 作者单位： | 1.山东科技大学 资源与环境工程学院，青岛 266510；2.山东科技大学 矿山灾害预防控制教育部重点实验室，青岛 266510 |
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| 基金项目： | 山东科技大学春蕾计划 |
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| 摘 要： | 以重塑土经 固结形成的试样以及经 固结后通过特殊应力路径达到特定应力状态的试样为对象，研究了在小应变范围内应力路径旋转对土体剪切模量的影响以及剪切模量随应变变化的趋势。研究表明，在小应变范围内：（1）剪切模量的初始值随试验应力路径与近期应力历史间的夹角 增大而增大，当两者完全相反时，应力路径旋转对土体在小应变条件下的剪切模量影响最大；完全一致时，其影响最弱。（2）割线剪切模量总是大于切线剪切模量；剪切模量随着剪切应变的增加而衰减，且衰减规律保持一致，但应力路径、应变范围不同时其衰减幅度不同。在小应变条件下，土体表现出各向异性，但随剪切应变的增加而逐渐减小，最终表示为近似各向同性；同时由应力路径旋转对模量的影响也随着剪切应变的增加而逐渐衰减。
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| 关 键 词： | 固结 小应变 剪切模量 应力路径旋转 |
| 收稿时间： | 2007-03-16 |
Effect of stress path circumgyration on shear modulus under small strain |
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| ZHANG Pei-sen.Effect of stress path circumgyration on shear modulus under small strain[J].Rock and Soil Mechanics,2009,30(3):820-824. |
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| Authors: | ZHANG Pei-sen |
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| Institution: | 1. CREE of Shandong University of Science and Technology, Qingdao 266510, China; 2. Key Laboratory of Mine Disaster Prevention and Control of Education Ministry, Shandong University of Science and Technology, Qingdao 266510, China |
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| Abstract: | Taking the remolded soil after consolidation and the samples under special stress state by special stress path as the objects, the effect of stress path circumgyration on shear modulus and the trend of shear modulus along with strain under condition of small strain are studied. Under the condition of small strain, (1) the initial value of shear modulus increases along with the increase of the angle between experimental stress path and recent stress history. If the two directions were entirely reverse, the effect of stress path circumgyration on shear modulus is the most; if they went all the same way, the effect is the weakest. (2) Secant shear modulus is always greater than tangent shear modulus; shear modulus attenuates along with the increase of shear strain, and the attenuation rule of shear modulus keeps the same. However, different stress paths and strain ranges lead to different attenuation ranges. Under the condition of small strain, anisotropy is shown; however, the anisotropy degree decreases with the increase of shear strain, and the approximately isotropy is got. At the same time, the effect of stress path circumgyration on shear modulus decreases gradually along with the increase of shear strain. |
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| Keywords: | consolidation small strain shear modulus stress path circumgyration |
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