取样扰动对土的工程性质指标影响的试验研究  

Experimental Study on Influence of Sampling Disturbance to Indices for Engineering Properties of Soils

作　　者：高大钊[1] 张少钦[2] 姜安龙[1] 李家平[1] 

机构地区：[1]同济大学,上海200092 [2]南昌航空工业学院,南昌330034

出　　处：《工程勘察》2006年第3期6-10,共5页Geotechnical Investigation & Surveying

摘　　要：本文报道了取样扰动对土的工程性质指标影响的一批研究成果。采用100mm和75mm两种直径的取土器取样作对比试验以研究取土器扰动的影响。试验证明取土器直径对试样的孔隙比、压缩系数、超固结比和天然强度等指标都有明显的影响。采用两种预固结处理的方法以恢复原生应力状态,用不固结不排水试验比较了应力状态对天然强度的影响。对取土过程中土体应变的分布及其对土样扰动的影响用有限元方法进行了模拟。In the paper, the influence of sampling disturbing on soil engineering properties has been studied. Two type of thin wall sampler, which diameter is 100mm and 75mm respectively, are used to compare the influence of sampling disturbing. It is proved that the diameter of sampler affects soil properties such as void ratio, compressibility, over consolidation ratio and nature strength obviously. The original stress state of soil samples is resumed by two pre-consolidation treatment methods. The unconsolidation undrained tests have been carried out to inspect the influence of stress state on nature strength. The strain distribution and the soil structure disturbing during sampling process have been simulated with finite element method.

关 键 词：取样扰动 取土器 试样预处理 压缩性 天然强度 

分 类 号：TL411[核科学技术—核技术及应用]