【摘要】 固结系数是岩土工程中较常采用的计算参数之一,大量的实际工程计算与监测结果表明,试验得到的固结系数偏小.为了探讨固结试验过程的内在特征,将常规固结试验仪器进行了改进,使其能够进行土样底部的孔压测定.经过100kPa,200kPa,400kPa3个不同固结压力下的固结试验,分析了试样底部的孔压上升规律与太沙基固结理论差异的原因;通过减小土样与仪器侧壁摩擦的对比试验,使上述差异得到一定的改善;又通过全自动应力路径三轴试验,分析了其他因素对固结试验的影响.更多还原

【Abstract】 The consolidation coefficient is an important parameter in geotechnical engineering. Results from calculation and observation in practical projects show that the consolidation coefficient obtained from experiments is normally underestimated. To probe the intrinsic behavior of soil during the process of consolidation tests, the conventional oedometer is improved so that it can measure the pore pressure at the bottom of soil specimen. Consolidation tests are performed under three different consolidation pressures, i.e. 100?kPa, 200?kPa, and 400?kPa, for analysis of the regularity of the increase of the pore pressure at the bottom of soil specimen and the cause of discrepancy against Terzaghi’s consolidation theory. By decrease of the friction between soil samples and sidewall of instruments, the discrepancy decreases to a certain degree. Besides, the effects of other factors on the consolidation test are analyzed by automatic stress-path controlled triaxial tests.更多还原