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硬质岩土材料在卸载条件下变形特性的时间效应。这一特性的正确预测对于预压效果的评价、开挖过程中土体的时变变形以及现场载荷试验中卸载特性的解释等许多实际问题都具有重要意义。通过对各种刚性岩土材料的试验研究,得到如下结论:1)即使在某一加载状态下以恒定的加载速率开始卸载,变形的增加也是以递减的速度进行的;2)当加载水平降低到一定程度时,不可逆变形率变为零;3)当加载水平进一步降低时,不可逆变形速率变为负值,而变形…在蠕变阶段,更多的离子随着时间的推移而减少,在松弛阶段,载荷随着时间的推移而增加。现有的岩土材料变形特性的时间效应理论大多针对加载阶段的变形。有鉴于此,建立了如下本构模型来解释上述问题:1)新的本构模型:将给定的应变增量分解为弹性和不可逆分量,而将给定的应力分解为无粘性和粘性分量。定义了无粘应力与加载、卸载等不可逆应变之间的滞回关系。然后,给定应力历史的当前应力状态由瞬时不可逆应变及其速率唯一地控制。该模型适用于几种类型的粘土和沉积软岩。2)TESRA(应变率和加速度的临时效应)模型:当前粘性应力是通过对不可逆应变、不可逆应变的增加和不可逆应变率的增加而增加的粘性应力进行积分而得到的。在这种积分中,考虑了这两种类型的粘性应力增量随不可逆应变的衰减。该模型适用于级配较差的砂岩。较少
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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