某变电站软土取/制样扰动影响分析  

Analysis of Disturbance Influence in Taking and Preparing for Samples in a Substation at Soft Clay Area

作　　者：刘益平[1] 任亚群[1] 康晨阳[1] 

机构地区：[1]江苏省电力设计院有限公司,江苏南京211102

出　　处：《电力勘测设计》2017年第1期10-12,25,共4页Electric Power Survey & Design

摘　　要：山某变电站软粘土结构性强、灵敏度高,土工试验结果受取/制样扰动影响大,无侧限抗压强度仅为天然强度的47.3%。试样经过K_0预固结处理后,无侧限抗压强度有大幅提高。说明K_0预固结处理后试样的结构强度有所恢复,消除了部分取/制样扰动的影响,试验成果更接近天然强度。固结快剪的固结过程恢复了部分取/制样扰动的影响,利用固结快剪指标计算地基承载力与利用静探指标估算结果基本一致。As soft clay has properties of strong structure and high sensitivity, disturbance in taking and preparing for samples has great influence on soil test results. According to the results, the unconfined compressive strength accounts for only 47.3% of the natural strength. Under the state of K_0 pre-consolidation, the unconfined compressive strength has improved significantly. The phenomena show that the structural strength has been restored under K_0 preconsolidation process, eliminating the effect of disturbances in taking and preparing for samples,the results are closer to the natural strength. Consolidation process in consolidated quick direct shear test partly eliminates the effects of the samples disturbance, and the calculated values of the bearing capacity are basically the same by using the index from the quick direct shear test and the CPT indicators.

关 键 词：取/制样扰动 K0预固结 无侧限抗压强度 天然强度 十字板剪切试验 

分 类 号：TU4[建筑科学—土工工程]