Generalization of Elastoplastic Model Using p and q for Geomaterials Based on the SMP Criterion

基于 SMP 准则的土工材料弹塑性模型的推广

• 批准号: 12650493
• 负责人: MATSUOKA Hajime
• 金额: $ 0.83万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650493/
• 关键词: Elastoplasticity; Constitutive equation; Three-dimension; Geomaterial; Strength; Deformation; Numerical analysis; Unsaturated soil; 弾塑性構成モデル; 3次元; 破壊規準; 降伏規準; 変換応力; 一般応力; ダイレイダンシー

1. An elastoplastic model for geomaterials in three-dimensional stresses. For applying a three-dimensional criterion the Extended SMP criterion to elastoplastic models for cohesive-frictional materials, a transformed stress based on the criterion is proposed, which is determined by making the criterion become a cone having the axis as the space diagonal in the transformed principal stress space. Furthermore, an elastoplastic model for geomaterials is presented, which takes the following three characteristics of goematerials into consideration. The first is the strength and deformation characteristics of geomaterials in three-dimensional stress; the second is the dilatancy characteristics of geomaterials; the third is the confining-pressure dependency of strength and deformation. The proposed model is capable of predicting the stress versus strain relations of geomaterials including cohesive-factional materials and granular materials in three-dimensional stress and a wide range of the c … More onfining pressure.2. Application of the proposed model to numerical analysis of rock-fill dam. In order to apply the model to practical engineering by using FEM, the elastoplastic constitutive tensor is derived. An example of the existing rock-fill dam was selected to demonstrate the usefiilness of the model in the finite element analysis for predicting deformation of geomaterials under embankment loading. The settlement and the lateral displacement of foundation computed by the proposed model fairly agree with the observed results.3. A three-dimensional elasto-plastic model for unsaturated soil. Using a transformed stress tensor based on the Extended SMP criterion, an elasto-plastic model was proposed for unsaturated soil. The influences of suction on the mechanical behavior ofunsaturated soil are taken into account in the model by using a parameter named as suction stress, which is added to net stress to form an effective stress, and associating a yield stress and model parameters with it. The proposed model needs few material parameters, which can be easily determined from the results of the ordinary tests, for example, oedometer and direct shear tests or biaxial test. It can predict the stress-strain-strength behavior of unsaturated soil under the conditions of three-dimensional stresses and constant or variable suction. A considerable number of triaxial compression and extension tests on unsaturated compacted clay were performed by using a suction controllable triaxial apparatus, to measure the stress-strain behavior under different stress paths with constant and decreasing suction. The prediction by the proposed model shows good agreement with the measured behavior of unsaturated soil not only in triaxial compression but also in triaxial extension under the conditions of constant suction and reduction in suction, which may induce an irrecoverable volumetric compression (collapse). Less

1。三维应力中的地材料的弹性模型。为了应用三维标准，提出了基于标准的基于标准的转换应力，将扩展的SMP标准扩展到弹性塑料模型，这是提出的，这是通过使标准变成轴作为轴作为轴作为轴作为空间对角线的圆锥形的。此外，提出了一种地材料的弹性塑性模型，该模型考虑了以下三个特征。首先是三维应力中地质材料的强度和变形特征。第二个是土地材料的扩张特征。第三个是强度和变形的限制依赖性。所提出的模型能够预测土地材料的应力与应变关系，包括三维应力中的粘性物质材料和颗粒材料，以及宽范围的C…更​​易于发射压力。2。拟议模型应用于岩石填充大坝的数值分析。为了通过使用FEM将模型应用于实践工程，得出了弹性塑料本构张量。选择了现有的岩石填充大坝的一个示例，以证明该模型在有限元分析中的使用，以预测路堤负荷下的地材料的变形。提出的模型计算得出的基础的设置和横向位移与观察到的结果相当一致。3。不饱和土壤的三维弹性塑料模型。使用基于扩展的SMP标准的转换应力张量，提出了一种弹性塑料模型用于不饱和土壤。通过使用称为任务应力的参数，将任务对不饱和土壤机械行为的影响考虑在模型中，该参数被添加到净应力中以形成有效的应力，并将屈服应力和模型参数与之相关联。所提出的模型几乎不需要材料参数，可以从普通测试的结果（例如卵形计和直接剪切测试或双轴测试）中轻松确定。它可以在三维应力和恒定或可变结果的条件下预测不饱和土壤的应力 - 应变力强度行为。通过使用任务控制的三轴装置进行了大量的三轴压缩和扩展测试，以测量在不同的应力路径下以恒定和减少的任务来测量应力 - 应变行为。提出的模型的预测与不仅在三轴压缩中，而且在三轴延伸的情况下，在恒定吸力和降低任务的条件下，不饱和土壤的测量行为良好，这可能会引起不可恢复的体积压缩（倒塌）。较少的

项目成果

原忠, 竹澤請一郎, 工藤アキヒコ, 松岡元, 孫徳安: "築堤時のロックフィルダム材料の弾塑性モデルとFEM解析(その1)-三軸試験データによるモデルの適用性の検討-"土木学会第56回年次学術講演概要集. III-B. 598-599 (2001)

Tadashi Hara、Keiichiro Takezawa、Akihiko Kudo、Hajime Matsuoka、Tokuyasu Son：“路堤期间堆石坝材料的弹塑性模型和 FEM 分析（第 1 部分）- 使用三轴试验数据检验模型适用性 -”日本土木工程师学会第 56 届学术年会讲座摘要。598-599（2001）

孫 徳安, 松岡 元など4名: "ロックフイルダムの堤体材料の弾塑性モデルとその検証"土木学会第55回年次学術講演会. 3-B. 692-693 (2000)

Deyasu Son、Hajime Matsuoka等4人：“堆石坝路堤材料的弹塑性模型及其验证”，日本土木工程学会第55届学术年会3-B 692-693。

孫徳安, 松岡元他5名: "三軸試験によるD級軟岩の変形・強度特性"第37回地盤工学研究発表会. (発表予定). (2002)

Dean Son、Hajime Matsuoka 等 5 人：“三轴试验 D 级软岩的变形和强度特性”第 37 届岩土工程研究会议（预定报告）（2002 年）。

Sun D.A, Matsuoka H.など4名: "An anisotropic hardening elastoplastic model for clay and sand and its application to numerical analysis"Proc. of 10th Int. Conference on Computer Methods and Advances in Geomechanics. 1. 407-412 (2001)

Sun D.A、Matsuoka H. 等 4 人：“粘土和砂子的各向异性硬化弹塑性模型及其在数值分析中的应用”，第 10 届地质力学计算机方法与进展会议论文。

Sun D.A., Matsuoka H. et al.: "Deformation and strength characteristics of D-class soft rock by triaxial tests"Proceedings of the 37th Japan National Conference on Geotechnical Engineering. in press. (2002)

孙D.A.、松冈H.等：《D级软岩变形与强度特性的三轴试验》第37届日本全国岩土工程会议论文集。