Additional void ratio and yield stress that can be easily determined by one-dimensional consolidation test are two representative parameters for the assessment of clayey soil structure. In this paper, a “structural parameter” that defined as the normalization of the integral of additional void ratio times effective vertical stress until yield stress was proposed to evaluate the disturbance induced by soil structure changes. By conducting oedometer tests on Hangzhou clay at various disturbed states, the compression index, yield stress, and structural parameter were obtained. The evolution of normalized additional void ratio during one-dimensional loading is presented to establish the soil structural indexing strategies for assessment of clay structure disturbances. Based on the laboratory investigations, a linear relationship between the normalized structural parameter and normalized yield additional void ratio was obtained. For a certain soil, specimens with the same initial void ratio but different disturbed state have a nearly constant void ratio when yielding. It is also found that soils with a higher plasticity index exhibit stronger structure and lower compressibility. In addition, quick direct shear tests were carried out to examine the undrained shear strength of soils at different disturbed states. The soil disturbance degree quantified from the undrained shear strength is found slightly higher than that from the structural parameter. This study can provide a reference for assessing the clayey soil structure.

可以通过一维固结试验轻松确定的额外孔隙率和屈服应力是评估黏性土壤结构的两个代表性参数。在本文中，提出了一个“结构参数”，其定义为附加孔隙比的积分乘以有效垂直应力直到屈服应力的归一化，以评估土壤结构变化引起的扰动。通过在各种扰动状态下对杭州黏土进行里程计测试，获得了压缩指数，屈服应力和结构参数。提出了一维荷载作用下归一化的附加孔隙比的演变过程，以建立评估粘土结构扰动的土壤结构索引策略。根据实验室调查，获得了归一化的结构参数和归一化的产率额外空隙率之间的线性关系。对于某种土壤，屈服时具有相同初始空隙率但受扰状态不同的标本具有几乎恒定的空隙率。还发现具有较高可塑性指数的土壤表现出较强的结构和较低的可压缩性。另外，进行了快速直接剪切试验，以检验在不同扰动状态下土壤的不排水剪切强度。由不排水的抗剪强度量化的土壤扰动度比结构参数略高。该研究可为评估黏性土壤结构提供参考。初始空隙率相同但受扰状态不同的试样在屈服时具有几乎恒定的空隙率。还发现具有较高可塑性指数的土壤表现出较强的结构和较低的可压缩性。另外，进行了快速直接剪切试验，以检验在不同扰动状态下土壤的不排水剪切强度。由不排水的抗剪强度量化的土壤扰动度比结构参数略高。该研究可为评价黏性土壤结构提供参考。初始空隙率相同但受扰状态不同的试样在屈服时具有几乎恒定的空隙率。还发现具有较高可塑性指数的土壤表现出较强的结构和较低的可压缩性。另外，进行了快速直接剪切试验，以检验在不同扰动状态下土壤的不排水剪切强度。由不排水的抗剪强度量化的土壤扰动度比结构参数略高。该研究可为评估黏性土壤结构提供参考。进行了快速直接剪切试验，以检验在不同扰动状态下土壤的不排水剪切强度。由不排水的抗剪强度量化的土壤扰动度比结构参数略高。该研究可为评估黏性土壤结构提供参考。进行了快速直接剪切试验，以检验在不同扰动状态下土壤的不排水剪切强度。由不排水的抗剪强度量化的土壤扰动度比结构参数略高。该研究可为评估黏性土壤结构提供参考。