土工离心试验应力相似差异特征与设计准则

王永志; 王海; 袁晓铭; 段雪锋

doi:10.11779/CJGE201811023

土工离心试验应力相似差异特征与设计准则 English Version

中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨 150080

基金项目: 中国地震局工程力学研究所基本科研业务费专项资助项目（2017B05）; 国家自然科学基金项目（51609218）; 黑龙江省自然科学基金（LC2015021）

详细信息

作者简介:
王永志(1984- ),男,副研究员,从事动力离心机试验理论、方法与技术研究工作。E-mail：yong5893741@163.com。

中图分类号: TU411
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出版历程
- 收稿日期: 2017-03-06
- 发布日期: 2018-11-24

Difference characteristics of stress similitude for geotechnical centrifuge modelling and design criteria

Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

摘要

摘要: 土工离心试验优越性的基础在于建立模型与原型相同的应力条件与分布,认识模型与原型之间应力相似差异与表征参数对控制系统误差和优化设计参数具有重要指导价值。引入总体分布应力、附加侧向应力和耦合动应力3个新概念与定义,对模型与原型之间应力差异特征、表征参数和设计准则等进行了深入研究。总体分布应力采用应力误差描述,表征参数为模型高度H和最大半径 ${{R}_{\max }}$ ;当 $H/{{R}_{\max }}$ ≤0.3和0.15,可控制模型极限应力误差≤10%和5%。附加侧向应力由模型中心剖面向两侧宽度增大分布,由模型宽度b、有效半径 ${{R}_{\text{ef}}}$ 和有效离心加速度 ${{a}_{\text{ef}}}$ 决定大小;以100 kPa为标准,给出了不同离心加速度下有效半径与允许模型设计宽度关系。耦合动应力影响采用目标与额外应力比进行评价,以 ${{R}_{\text{ef}}}$ 和角速度 $\omega$ 为表征参数,给出了应力比以10%和20%为标准的 ${{a}_{\text{ef}}}$ - ${{R}_{\text{ef}}}$ 的临界关系曲线;当 ${{a}_{\text{ef}}}$ ≥10g、 ${{R}_{\text{ef}}}$ ≥4 m时,耦合动应力的影响可以忽略。研究提出的新概念、表征参数和设计准则,为改进设备、模型参数设计和推动量化研究提供研究基础与参考依据。
- 土工离心试验 /
- 应力相似 /
- 附加侧向应力 /
- 耦合动应力 /
- 设计准则
Abstract: The advantage of geotechnical centrifuge modelling is founded on the exactly similar stress levels and distribution between models and prototypes. To recognize the differences and characterization parameters of stress similitude of model and prototype is of significant value to decreasing systematic errors and optimizing design parameters. Three new concepts of general distributed stress, additional lateral stress and coupling dynamic stress are proposed and defined, by using which the difference characteristics, characterization parameters and design principles of model stress compared to those of prototype are studied. The general distributed stress is represented by the stress error referring to the model height H and the maximum radius ${{R}_{\max }}$ , and as $H/{{R}_{\max }}$ ≤0.3 and 0.15, the stress error limits of soil model are less than 10% and 5%. The magnitude of additional lateral stress increases from center section to two width boundaries, and is mainly governed by the model width b, effective radius ${{R}_{\text{ef}}}$ and effective centrifugal acceleration ${{a}_{\text{ef}}}$ . Selecting 100 kPa as a criterion, the allowable model width limits with varying effective radius for different centrifugal accelerations are proposed. The influence of coupling dynamic stress is evaluated through the ratio of the target stress to the extra stress involving two key parameters of ${{R}_{\text{ef}}}$ and angular velocity $\omega$ . With 10% and 20% as the criteria of the stress ratio, the critical curves of ${{a}_{\text{ef}}}$ - ${{R}_{\text{ef}}}$ are obtained and if ${{a}_{\text{ef}}}$ ≥10g and ${{R}_{\text{ef}}}$ ≥4 m, the influence of coupling dynamic stress can be ignored. The proposed new concepts, characterization parameters and design criteria provide the reference and basis for the parametric design of facilities and soil models and development of quantitative researches.
- geotechnical centrifuge model /
- stress similitude /
- additional lateral stress /
- coupling dynamic stress /
- design criterion

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参考文献(18)

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土工离心试验应力相似差异特征与设计准则 English Version

作者简介: 王永志(1984- ),男,副研究员,从事动力离心机试验理论、方法与技术研究工作。E-mail：yong5893741@163.com。

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出版历程

Difference characteristics of stress similitude for geotechnical centrifuge modelling and design criteria

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出版历程

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作者简介:
王永志(1984- ),男,副研究员,从事动力离心机试验理论、方法与技术研究工作。E-mail：yong5893741@163.com。