本研究目地在建立一個異向性、粘塑性及與速率相關之有效應力之土壤模式。該模式採用Kutter and Sathialingam之粘塑性理論及Wheeler et al.所建議降伏面方程式。本研究在參考Kutter and Sathialingam之粘塑性理論時，針對其粘塑性應變增量之求取方式，建議了量化及制式之計算方式，改進Kutter and Sathialingam之粘塑性理論p值須固定之限制。
本文中先對台北粉土質黏土力學特性做一介紹，再藉由將各種知名或較常用塑性及粘塑性模式組合律、降伏面、潛在勢能面及參數做一簡單說明，並對Wheeler et al.建議降伏面方程式與世界各地區天然土壤及台北粉土質黏土初始降伏面比對，以確認其適用性。
模式中之應變軟化定則係採用Wheeler et al.所建議的公式，但藉由參數研究，利用CK0UC，CK0UE試驗，求出適用台北粉土質黏土之基準面旋轉參數及對參數之敏感度。參數建立後，再分析CIU，CK0UC-LCR試驗並與試驗值比對，以作為模式合理性驗證的部分。
最後以此模式分析TNEC案例，並與監測值比對，以確認此模式具有依時性之能力。

The objective of this study was to derive an anisotropic viscoplastic rate dependent constitutive model. The model was derived on the basis of the viscoplastic theory proposed by Kutter and Sathialingam and the yield surface function adopted by Wheeler et al. In this paper suggests a regular method to figure the viscoplastic strain to avoid Kutter and Sathialingam theory retricting the p is constant.
In this paper, explain the mechanics characteristics of the Taipei silty clay, and introduce more famous or used most often plastic and visco-plastic soil model. The adopted yield surface function was more consistent with the yield surface of the natural clay in the world and Taipei silty clay, compared with the existing constitutive models.The model’s softening rule is derived by Wheeler et al. and the parameters are to rebuild which were studing by K0-consolidated undrained compression and extension tests.
After rebuilding parameters, the model confirmed able to simulate the undrained stress strain response for the tests aforementioned. By parameters study, check the parameters sensitive to undrained strength. The model was also used to simulate the isotropic consolidated and K0-consolidated undrained creep test. Results show that the predicted strain from the proposed model was close to the test data. Especially the model is able to predict the tertiary creep failure when the soil is subject to high stress level.
Finally, analysis the TNEC deep excavation case and was verified by the field data. To make sure the model has the time dependent ability.

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