淤泥水泥土变角剪切力学特性试验研究  

Experimental study on mechanical properties of silt cement soil under variable angle shear

作　　者：刘文献 吕业锋 杨栋 唐昌意 马祖遥 LIU Wenxian;LÜYefeng;YANG Dong;TANG Changyi;MA Zuyao(Zhuhai Institute of Urban Planning&Design,Zhuhai 519000,China;Zhuhai Construction Project Quality Monitoring Station,Zhuhai 519000,China)

机构地区：[1]珠海市规划设计研究院,珠海519000 [2]珠海市建设工程质量监测站,珠海519000

出　　处：《建筑结构》2023年第17期145-150,共6页Building Structure

基　　金：珠海市产学研合作项目(ZH22017001200149PWC)。

摘　　要：以珠海市洪湾片区海相淤泥为研究对象,开展了不同水泥掺入量、不同养护龄期和不同剪切角度条件下淤泥水泥土的变角剪切试验。试验结果表明:淤泥水泥土剪切强度与养护龄期呈指数相关性,随着剪切角度的增大,拟合优度逐步降低,当水泥掺入量为25%时剪切角度对拟合优度影响较小;剪切强度与水泥掺入量呈正线性相关性;当剪切角度小、水泥掺入量高、养护龄期长时,剪切强度高,反之则低;黏聚力与养护龄期呈指数相关性,黏聚力与水泥掺入量呈正线性相关性;内摩擦角与养护龄期、水泥掺入量并无相关性,内摩擦角分布在20.3°~26.6°之间,均值23.3°。水泥掺入量为15%~20%时,剪切强度与抗压强度的换算系数可取0.37,黏聚力与抗压强度的换算系数可取0.24。Marine silt in Hongwan area of Zhuhai city was taken as the research object,and the variable angle shear tests of siltcement soil were carried out under the conditions of different cement incorporation amount,different curing ages and different shear angles.The test results show that the shear strength of silt cement soil is exponentially correlated with the curing age,and the goodness of fit gradually decreases with the increase of shear angle.When the cement content is 25%,the shear angle has little effect on the goodness of fit.There is a positive linear correlation between shear strength and cement incorporation.The shear strength is high when the shear angle is small,the cement incorporation is high and the curing age is long,and it is low otherwise.There is an exponential correlation between cohesiveness and curing age and a positive linear correlation between cohesiveness and cement incorporation.There is no correlation between the internal friction angle and curing age and cement incorporation amount.The internal friction angle ranges from 20.3°to 26.6°with an average of 23.3°.When the cement content is 15%~20%,the conversion coefficient between shear strength and compressive strength can be 0.37,and the conversion coefficient between cohesion and compressive strength can be 0.24.

关 键 词：淤泥水泥土 水泥掺入量 养护龄期 变角剪切试验 剪切强度 黏聚力 内摩擦角 

分 类 号：TU411[建筑科学—岩土工程]