地盤材料の変形特性に対する時間効果の新しい展開
地基材料变形特性时间效应的新进展
基本信息
- 批准号:11450180
- 负责人:
- 金额:$ 5.25万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B).
- 财政年份:1999
- 资助国家:日本
- 起止时间:1999 至 2000
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The time effects on the deformation characteristics under unloaded conditions of stiff geomaterials, such as Pleistocene clays, sand/gravel, sedimentary soft rock and cement-mixed soils, were studied theoretically and experimentally. The proper prediction of this behavior is important for many practical issues, such as evaluation of preloading effects, time-dependent deformation or ground subjected to excavation and interpretation of the unloading behavior in the field loading tests. From the present study, the following conclusions were obtained commonly with various stiff geomaterials tested in the present study :1) Even after unloading is started at a constant load rate from a certain loaded state, the increase in the deformation continues at a decreasing rate.2) When the load level is decreased to a certain level, the rate of irreversible deformation rate becomes zero.3) When the load level is further decreased, the irreversible deformation rate becomes negative, while the deformat … More ion decreases with time at a creep stage and the load increases with time at a relaxation stage.Most of the existing theories on the time-effects on the deformation characteristics of geomaterials deal with the deformation during loading stage. In view of the above, the following constitutive models were developed to explain the above.1) New isotach model ; a given strain increment is decomposed into the elastic and irreversible components, while a given stress is decomposed into the inviscid and viscous components. The hysteretic relationships between the inviscid stress and the irreversible strain for loading, unloading and so on are defined. Then, the current stress state for a given stress history is uniquely controlled by instantaneous irreversible strain and its rate. This model is relevant to several types of clay and sedimentary softrocks.2) TESRA (temporary effects of strain rate and acceleration) model : the current viscous stress is obtained by integrating with respect to the irreversible strain the viscous stress increment by the increase in the irreversible strain and that by the increase in the irreversible strain rate. In this integration, a decay of these two types of viscous stress increments with the irreversible strain is taken into account. This model is relevant to poorly graded sands. Less
从理论和试验两方面研究了更新世粘土、砂砾石、沉积软岩和水泥土等刚性岩土材料在卸载条件下变形特性的时间效应。这种行为的正确预测是重要的许多实际问题,如预加载效果的评估,时间相关的变形或地面受到开挖和解释卸载行为在现场加载试验。通过对不同刚性岩土材料的试验研究,得出了以下结论:1)从某一加载状态开始,以恒定加载速率卸载后,变形量仍以减小的速率继续增加; 2)当加载水平降低到一定水平时,不可逆变形速率为零; 3)当加载水平进一步降低时,不可逆变形速率为负值,变形量随加载速率的增加而减小; 4)当加载水平降低到一定水平时,不可逆变形速率随加载速率的增加而减小; 5)当加载水平降低到一定水平时,不可逆变形速率随加载速率的增加而减小; 6)当加载水平降低到一定水平时,不可逆变形速率随加载速率的增加而减小 ...更多信息 现有的岩土材料变形特性的时间效应理论大多是从加载阶段的变形来考虑的。1)新的等速线模型;将给定的应变增量分解为弹性和不可逆分量,将给定的应力分解为无粘和粘性分量。定义了加载、卸载等情况下无粘应力与不可逆应变之间的滞回关系。然后,对于一个给定的应力历史,当前的应力状态是唯一控制的瞬时不可逆应变及其速率。该模型适用于几种粘土和沉积软岩。2)TESRA(Temporary Effects of应变速率和加速度)模型:当前粘性应力是通过对不可逆应变的粘性应力增量和不可逆应变速率的粘性应力增量进行积分得到的。在这种集成中,这两种类型的粘性应力增量的衰减与不可逆应变考虑。该模型适用于级配不良的砂。少
项目成果
期刊论文数量(44)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Siddiquee,M.S.A.and Tatsuoka,F.: "Modeling time-dependent stress-strain behavior of stiff geomaterials and its Applications"Proc.of 10th International Conference on Computer Methods and Advances in Geomechanics (IACMAG), Tucson. (2001)
Siddiquee, M.S.A. 和 Tatsuoka, F.:“模拟刚性岩土材料的时间相关应力应变行为及其应用”,第 10 届地质力学计算机方法和进展国际会议 (IACMAG),图森。
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Tatsuoka, F.: "Time-dependent deformation characteristics of stiff geomaterials in engineering practice"The Theme Lecture, Proc.of the Second International Conference on Pre-failure Deformation Characteristics of Geomaterials, Torino. Vol.2 (to appear). (
Tatsuoka, F.:“工程实践中刚性岩土材料随时间变化的变形特征”主题演讲,第二届岩土材料故障前变形特征国际会议论文集,都灵。
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Sugai,M.,Tatsuoka,F.,Kuwabara,M.and Sugo,K.: "Strength and Deformation Characteristics of Cement-Mixed Soft Clay"Proc.of Int.Symp.on Coastal Geotechnical Engineering in Practice (IS-Yokohama), Balkema. Vol.1. 521-527 (2000)
Sugai,M.,Tatsuoka,F.,Kuwabara,M.和Sugo,K.:“水泥混合软粘土的强度和变形特性”Proc.of Int.Symp.on Coastal Geotechnical Engineering in Practice (IS-Yokohama)
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Tatsuoka,F.et.al.: "Stress-Strain Behaviour at Small Strains of Unbound Granular Materials and its Laboratory Tests"Keynote Lecture,Proc.of Workshop on Modelling and Advanced testing for Unbound Granular Materials,Lisboa. 17-61 (1999)
Tatsuoka,F.et.al.:“未结合颗粒材料小应变的应力应变行为及其实验室测试”主题演讲,未结合颗粒材料建模和高级测试研讨会论文集,里斯本。
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Matsushita,M.,Tatsuoka,F.,Koseki,J.,Cazacliu,B.,DiBenedetto,H. and Yasin,S.J.M.: "Time effects on the pre-peak deformation properties of sands"Proc.Second Int.Conf. on Pre-Failure Deformation Characteristics of Geomaterials, IS Torino'99 (Jamiolkowski et
松下,M.,龙冈,F.,Koseki,J.,Cazacliu,B.,DiBenedetto,H.
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{{ truncateString('TATSUOKA Fumio', 18)}}的其他基金
A drastic improvement of strength and stiffness of compacted soil by high compaction and its consideration in design and compaction control
高压实显着提高压实土的强度和刚度及其设计和压实控制的考虑
- 批准号:
23560597 - 财政年份:2011
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Highly seismic-resistant new type bridge taking advantage ofgeosynthetic-reinoforced soil
利用土工合成材料加筋土的高抗震新型桥梁
- 批准号:
20360215 - 财政年份:2008
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Overall understanding of the factors for inelastic behaviour of geomaterial and their interactions
全面了解岩土材料非弹性行为的因素及其相互作用
- 批准号:
18360231 - 财政年份:2006
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Seismic reinforcing of existing soil structures and advanced application of soil reinforcing technology to construction of highly aseismic environment-friendly soil structures
既有土结构抗震加固及土体加固技术在高抗震环境友好土结构建设中的先进应用
- 批准号:
13852011 - 财政年份:2001
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (S)
Three-dimensional visco-elasto-plastic stress-strain-properties at small strains of stiff geomaterials
刚性岩土材料小应变下的三维粘弹塑性应力应变特性
- 批准号:
09450180 - 财政年份:1997
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Study on the substantial increase in the seismic stability of reinforced soil structures by preloading and prestressing
预压和预应力大幅提高加筋土结构抗震稳定性的研究
- 批准号:
09555149 - 财政年份:1997
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Deformation and strength characteristics of geomaterials shear loaded for long term
岩土材料长期剪切荷载的变形和强度特性
- 批准号:
08455218 - 财政年份:1996
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of prestressed geotextile-reinforced soil
预应力土工布加筋土的研制
- 批准号:
07555150 - 财政年份:1995
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Study into stiffness of geomaterials for a wide range of strain under static and dynamic loading conditions
研究静态和动态加载条件下大范围应变下岩土材料的刚度
- 批准号:
02452196 - 财政年份:1990
- 资助金额:
$ 5.25万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
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