摘要
软弱夹层的工程地质性质既与地应力、地下水等环境条件有关,也与其成因性质、粒度成分和矿物成分等有关。试验研究了成因性质、颗粒组成及物质组成相同条件下,软弱夹层抗剪强度参数随含水量、性状指标(W/Wp)和干密度变化的关系,并建立了相关方程。结果表明:夹层强度随含水量和性状指标减小而增大,随干密度增大而增大。因此,在对具体工程的软弱夹层进行强度参数取值时要综合考虑夹层在原位条件下的含水量、颗粒组成、粘土矿物成分及所处的地应力环境等因素。并探讨了重力坝规范中仅用粒度成分定量指标选取软弱结构面抗剪强度参数存在的不足之处。
The engineering properties of weak intercalations are not only related to the environmental conditions,such as ground stress,ground water,etc.,but also to their genesis,granularity composition and mineral composition.Under the same genesis,grain composition and material composition,the relationship between shear strength and water content,properties index（W/Wp）,dry density is analyzed by experimental study,and the related equations are established.The results reveal that shear strength increases with the decrease of water content and properties index and the increase of dry density.Therefore,to select strength parameters of weak intercalation in the specific engineering,the factors,such as water content,grain composition,clay mineral composition,and ground stress,should be taken into account.In addition,shortcomings of the strength parameters of weak intercalation that only relies on the quantify index of granularity composition in Design Specification for concrete gravity dams is discussed.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第12期35-41,共7页
Journal of Chongqing University
基金
国家自然科学基金资助项目(41072229)
关键词
软弱夹层
强度参数
粒度成分
物质组成
稠度状态
地应力
weak intercalation
strength parameters
granularity composition
consisting of matter
consistency state
ground stress
