饱和软土K_0固结下三轴固结不排水剪试验分析  

Triaxial Consolidation and Undrained Shear Test Analysis Under K0 Consolidation of Saturated Soft Soil

作　　者：王小卫[1] WANG Xiao-wei(Jiangsu Jianyuan Geotechnical Engineering Survey Co.,Ltd.,Nanjing Jiangsu 210019,China)

机构地区：[1]江苏省建苑岩土工程勘测有限公司,江苏南京210019

出　　处：《西部探矿工程》2018年第11期11-13,共3页West-China Exploration Engineering

摘　　要：为了分析K_0固结与有效自重压力等压预固结饱和软土三轴固结不排水剪强度指标的不同,选用南京长江漫滩饱和软土,采用应力—应变式三轴仪进行了K_0固结和有效自重压力等压预固结下三轴固结不排水剪试验。试验表明K_0固结(cu)试验应力—应变关系没有峰值出现,主应力差(σ_1-σ_3)随着侧向固结应力(σc)的增加而缓慢增加;与有效自重压力等压预固结不排水总应力强度指标相比,K_0固结下粘聚力(c)值小而内摩擦角(φ)值大;现场原位十字板试验结果与K_0固结下三轴固结不排水剪指标相符。In order to analyze the differences between the triaxial consolidation and undrained shear strength indexes of saturated soft soil, such as K0 consolidation and effective self-weight pressure, the saturated soft soil of nanjing Yangtze river floodplain was selected, and the stress-strain triaxial apparatus was used to carry out the triaxial consolidation and non-drainage shear tests under K0consolidation and effective self-weight pressure preconsolidation. The test shows that there is no peak of stress-strain relationship in K0consolidation test（cu）, The main stress difference（al-a3） increases slowly with the increase of lateral consolidation stress （ac）. Compared with the effective self-weight pressure isobaric preconsolidation without drainage total stress intensity index, the cohesive force （c）value of K0 consolidation is small and the friction Angle value of inner friction （cp） is large. The results of field insitu cross plate test are consistent with the triaxial undrained shear under Ko consolidation.

关 键 词：三轴试验 K0固结 固结不排水剪 强度指标 十字板试验 

分 类 号：P642[天文地球—工程地质学]