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大量的室内和现场试验表明软黏土存在长期变形难以收敛的问题,为了更深入地认识软黏土的蠕变特性,首先,从微观物理化学角度探讨蠕变机制;然后,深入分析一维应力条件下次固结系数的演变规律以及确定方法和三轴排水、不排水蠕变特性及黏土的长期抗剪强度、室内旁压试验和现场试验等复杂应力下的黏土蠕变特性等,并且讨论黏土蠕变特性与应变速率和应变松弛特性在一维和三轴条件下的关联性;最后,从黏土次固结特性与微观结构的相关性、如何准确描述次固结系数的非线性及蠕变过程中应力剪胀剪缩关系发展等三方面更深入地探讨软黏土蠕变特性。
A large number of indoor and field tests show that the long-term deformation of soft clay is difficult to converge. To understand the creep characteristics of soft clay in depth, the creep mechanism is first discussed from the microscopic physical-chemical point of view. Then, The coefficient of secondary consolidation and the method of determination and triaxial drainage, undrained creep characteristics and the long-term shear strength of clay, the creep characteristics of clay under complex stress such as in-situ pressure test and field test, Finally, from the correlation between sub-consolidation characteristics of clay and microstructure, how to accurately describe the nonlinear coefficient of secondary consolidation coefficient and the creep process Stress dilatancy and shear relationship between the development of the three aspects of clay creep characteristics of more in-depth discussion.