软弱夹层强度参数的主要影响因素分析  

ANALYSIS OF MAIN FACTORS INFLUENCING STRENGTH PARAMETERS OF SOFT INTERCALATION

作　　者：唐良琴[1,2] 聂德新[3] 刘东燕[2] 余先华[4] 

机构地区：[1]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074 [2]重庆大学土木工程学院,重庆400044 [3]成都理工大学工程地质研究所,成都610059 [4]重庆市沙坪坝区国土资源管理分局,重庆400038

出　　处：《工程地质学报》2012年第2期289-295,共7页Journal of Engineering Geology

基　　金：国家自然科学基金项目(41072229);中国博士后科学资金特别资助项目(200902284)

摘　　要：在大量试验研究以及总结前人研究成果的基础上,全面分析研究了物质组成、组构特征、粒度成分、含水量和地应力等主要因素对软弱夹层抗剪强度的影响,这些影响因素对夹层强度的影响是相互制约、相互影响的,并不是孤立的。因此,要正确、合理地给定软弱夹层强度参数,必须综合考虑各因素的影响,并抓住其主控因素。天然性状指标(w/wP)是一个能反映夹泥的含水量、密实度,黏土矿物成分、黏粒含量以及夹泥稠度状态的指标。以向家坝为例研究了性状指标(w/wp)与强度参数间的相关性,其相关性良好,并建立了性状指标和强度参数间的相关方程,这对容易获得天然性状指标的夹层的强度参数取值是非常方便的。This paper is based on a comprehensive literature and a large number experimental tests.It comprehensively analyzes and studies the influences of main factors on strength of soft intercalation.The factors include substance,fabric characteristics,granularity composition,water content and ground stress.They affect the strength parameter of weak intercalation and are mutual restraint and influence,not isolated.Therefore,to take full consideration of all kinds of factors and to catch and hold the main controlling factors are the precondition that the strength parameter of weak intercalation is given correctly and reasonably.Natural characteristic index（w/wP） is a comprehensive index.It reflects the soil water content,degree of density,the types and contents of clay minerals,clay content and consistency conditions.This paper takes Xiangjiaba hydropower construction as an example.It studies the relativity between strength parameter and characteristic index（w/wP）.It establishes a functional expression to describe the relation between strength parameter and characteristic index（w/wP）.The expression is based on the results obtained from a large number of shear strength tests,water content and liquid/plastic limit determination test.These tests are performed at field or in laboratory.The results show that excellent correlation between strength parameter and characteristic index（w/wP）.Therefore,use of relevant equations can conveniently give values of strength parameters of soft/weak intercalation when the natural characteristic index is known.

关 键 词：软弱夹层 强度参数 粒度成分 物质成分 含水量 地应力 性状指标 

分 类 号：P642[天文地球—工程地质学]