When variations occur in the water content or dry bulk density of soil,the contact angle hysteresis will affect the soil-water characteristic curve(SWCC).The occurrence of the contact angle hysteresis can be divided i...When variations occur in the water content or dry bulk density of soil,the contact angle hysteresis will affect the soil-water characteristic curve(SWCC).The occurrence of the contact angle hysteresis can be divided into slipping and pinning.It is difficult to determine the effect of pinning existence on SWCC by tests.In this study,the effect of contact angle hysteresis on SWCC was analyzed either in the case of no variations in soil dry bulk density with changes in soil water content or no variations in soil water content with changes in soil dry bulk density.In both cases,soil particles were simplified to the spherical particle model.Based on the geometrically mechanic relationship between the particles and connecting liquid bridges,a physical model for predicting the SWCC was derived from the spherical particle model.Adjusting parameters made the model applicable to various soils,that is,the cohesive soil was considered as micron-sized spherical particles.Through the simulations on SWCC test data of sand,silt,clay,and swelling soil,it was confirmed that the physical model possessed good reliability and practicability.Finally,the analysis of rationality of contact angle was performed based on the basic assumptions of the model.展开更多
基于上海某科研实验室的结构设计,对其超限情况进行分析判别,发现结构存在扭转不规则、楼板局部不连续、侧向刚度不规则、竖向抗侧力构件不连续和有效楼板宽度偏窄的不规则项。针对结构的不规则项,采取合理的加强措施,并用YJK 4.0和MIDA...基于上海某科研实验室的结构设计,对其超限情况进行分析判别,发现结构存在扭转不规则、楼板局部不连续、侧向刚度不规则、竖向抗侧力构件不连续和有效楼板宽度偏窄的不规则项。针对结构的不规则项,采取合理的加强措施,并用YJK 4.0和MIDAS Gen 2021对其进行计算分析,保证结构的主要指标满足规范的要求。同时,对因建筑功能要求形成的多处穿层柱以及西北角连桥薄弱部位进行针对性分析,发现均能满足规范要求,保证了结构的安全性和可靠性。展开更多
基金Supported by the National Natural Science Foundation of China (No. 50979028)the Program of the Chinese Ministry of Water Resources (No. 200801065)
文摘When variations occur in the water content or dry bulk density of soil,the contact angle hysteresis will affect the soil-water characteristic curve(SWCC).The occurrence of the contact angle hysteresis can be divided into slipping and pinning.It is difficult to determine the effect of pinning existence on SWCC by tests.In this study,the effect of contact angle hysteresis on SWCC was analyzed either in the case of no variations in soil dry bulk density with changes in soil water content or no variations in soil water content with changes in soil dry bulk density.In both cases,soil particles were simplified to the spherical particle model.Based on the geometrically mechanic relationship between the particles and connecting liquid bridges,a physical model for predicting the SWCC was derived from the spherical particle model.Adjusting parameters made the model applicable to various soils,that is,the cohesive soil was considered as micron-sized spherical particles.Through the simulations on SWCC test data of sand,silt,clay,and swelling soil,it was confirmed that the physical model possessed good reliability and practicability.Finally,the analysis of rationality of contact angle was performed based on the basic assumptions of the model.
文摘基于上海某科研实验室的结构设计,对其超限情况进行分析判别,发现结构存在扭转不规则、楼板局部不连续、侧向刚度不规则、竖向抗侧力构件不连续和有效楼板宽度偏窄的不规则项。针对结构的不规则项,采取合理的加强措施,并用YJK 4.0和MIDAS Gen 2021对其进行计算分析,保证结构的主要指标满足规范的要求。同时,对因建筑功能要求形成的多处穿层柱以及西北角连桥薄弱部位进行针对性分析,发现均能满足规范要求,保证了结构的安全性和可靠性。
