部分排水条件下饱和黏土的强度试验研究

摘要

In terms of the instability problems in later-stage surcharge of embankment engineering, study on the effects of drainage conditions on clay strength is carried out with constant-strain-increment-ratio triaxial tests of reconstituted saturated kaolinite.Test results show that the deviator stress increases with the increase of strain increment ratio, while the excess pore pressure decreases with the increase of strain increment ratio.In the mid and later stages of tests under partial drainage conditions, the shearing samples are close to or in the critical state, while limiting the drainage or accelerating the loading velocity may cause failure.%针对边坡堆载工程中后期堆载发生失稳破坏的问题,通过对重塑饱和高岭土的常应变增量比三轴试验,进行排水条件对于黏土抗剪强度影响的研究.试验结果表明黏土的强度会随着应变增量比的增大而增大,而产生的超孔压会随着应变增量比的增大而减小.部分排水条件下试验中、后期受剪土样会长时间接近或达到临界状态,限制排水以及提高加载速率可能会导致土样发生破坏.