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
基本信息
- 批准号:08455218
- 负责人:
- 金额:$ 4.54万
- 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:1996
- 资助国家:日本
- 起止时间:1996 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The deformation characteristics at small strain levels of a wide variety of geomaterials when loaded after having been subjected to shear stress for a long duration of time in the field were investigated by means of laboratory shear tests. As the geomaterials to be tested, sand, clay, gravel, sedimentary softrock and cement-treated sand was selected. In the triaxial tests, axial strains, which were free from effects of bedding error, were measured locally from less than 0.001%.The following was found from the test results :1) Except for cement-treated soils, the deformation become elastic for some stress range when loaded again after creep deformation has occurred at a constant shear stress level. As loaded further, the stress-strain relation rejoins the primary stress-strain relation exhibiting a relatively clear yielding. This behavior can be modeled as the kinematic yielding. In some cases, the reloaded stress-strain curve overshoot exceeding the primary curve. The effects of strain rate on the deformation characteristics before the yielding upon the restart of loading is much smaller than that observed when loaded monotonously from the isotropic stress state.2) The creep rate decrease after unloaded from a higher stress level. For relatively stiff geomaterials, when unloaded to larger extents, noticeable creep recovery can be observed. This behavior leads to the effects of strain rate at unloading states in such that the tangential stiffness decreases with the decrease in the strain rate.
通过实验室剪切试验,研究了多种岩土材料在经受长时间剪切应力加载后,在小应变水平下的变形特征。试验材料选择砂、粘土、砾石、沉积软岩和水泥处理砂。在三轴试验中,不受层理误差影响的轴向应变在局部测量范围小于0.001%。试验结果表明:1)除经水泥处理的土外,在恒定剪应力水平下发生蠕变后,再加载时,在一定应力范围内变形变为弹性。进一步加载后,应力-应变关系回归到原始应力-应变关系中,表现出较明显的屈服。这种行为可以用运动学屈服来建模。在某些情况下,重新加载的应力-应变曲线超过了原始曲线。应变速率对重新加载后屈服前变形特性的影响远小于从各向同性应力状态单调加载时的影响。2)从较高应力水平卸载后,蠕变速率减小。对于相对坚硬的岩土材料,当卸载到较大程度时,可以观察到明显的蠕变恢复。这种行为导致卸载状态下应变速率的影响,即切向刚度随着应变速率的减小而减小。
项目成果
期刊论文数量(15)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Uchimura,T.,Tatsuoka,F.,Sato,T.,Tateyama,M.and Tamura, Y: "Performance of preloaded and prestressed geosynthetic-reinforced soil" Proc.Int.Symp.on Earth Reinforcement,Fukuoka,Balkema (Ochiai et al.,eds). Vol.1. (1996)
Uchimura,T.、Tatsuoka,F.、Sato,T.、Tateyama,M. 和 Tamura, Y:“预载和预应力土工合成材料加筋土的性能”Proc.Int.Symp.on Earth Reinforcement,福冈,Balkema(Ochiai)
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松本正士,佐藤剛司,龍岡文夫: "堆積泥岩の変形係数に及ぼすクリープ履歴およびひずみ速度の影響" 第31回地盤工学研究発表会. Vol.31,No.1. (1997)
Masashi Matsumoto、Tsuyoshi Sato、Fumio Tatsuoka:“蠕变历史和应变速率对沉积泥岩变形系数的影响”第 31 届岩土工程研究会议,第 31 卷,第 1 期(1997 年)。
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Tatsuoka,F.,Uchimura,T.,Tateyama,M.and Muramoto,K.: "Creep Deformation and Stress Relaxation in Preloaded/Prestressed Geosynthetic-Reinforced Soil Retaining Walls" Session "Measuring and Modeling Time-Dependent Soil Behavior",ASCE Washington Convention. 2
Tatsuoka,F.、Uchimura,T.、Tateyama,M. 和 Muramoto,K.:“预载/预应力土工合成材料加筋土挡土墙中的蠕变变形和应力松弛”会议“随时间变化的土壤行为的测量和建模”,ASCE
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Uchimaru, T., Tatsuoka, F., Sato, T., Tateyama, M.and Tamura, Y.: "Performance of preloaded and prestressed geosynthetic-reinforced soil" Proc.Int.Symp.on Earth Reinforcement, Fukuoka, Balkema (Ochiai et al., eds). Vol.1. (1996)
Uchimaru, T.、Tatsuoka, F.、Sato, T.、Tateyama, M. 和 Tamura, Y.:“预载和预应力土工合成加固土的性能”Proc.Int.Symp.on Earth Reinforcement,福冈,Balkema(
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Uchimura,T.,Tasuoka,F.,Sato,T.,Tatevama,M.and Tamura,Y: "Performance of preloaded and prestressed geosynthetic-reinforced soil" Proc.Int.Symp.on Earth Reinforcement,Fukuoka,Balkema(Ochiai et al.,eds). Vol.1. (1996)
Uchimura,T.、Tasuoka,F.、Sato,T.、Tatevama,M. 和 Tamura,Y:“预载和预应力土工合成材料加筋土的性能”Proc.Int.Symp.on Earth Reinforcement,福冈,Balkema(Ochiai)
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TATSUOKA Fumio其他文献
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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:
$ 4.54万 - 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:
$ 4.54万 - 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:
$ 4.54万 - 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:
$ 4.54万 - 项目类别:
Grant-in-Aid for Scientific Research (S)
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
- 批准号:
11450180 - 财政年份:1999
- 资助金额:
$ 4.54万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
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:
$ 4.54万 - 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:
$ 4.54万 - 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:
$ 4.54万 - 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:
$ 4.54万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
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