湿陷性黄土地区中静压桩的挤土效应尚不明确。利用应力路径三轴仪进行应变保持试验,模拟沉桩及随后的桩周土体的应力状态和物理性质的改变,特别是浸水后的挤土效应的变化。试验结果表明:沉桩后挤土应力不断衰减,浸水造成进一步衰减,最后的稳定值与围压相关;桩周土体在挤土应力作用下不断固结,直至稳定,浸水后体变有显著增大。 The squeezing effect of the static pressure pile in collapsible loess area is not yet clear. Strain-holding tests were carried out using a stress path triaxial apparatus to simulate the changes of the stress state and physical properties of the sinking and subsequent soil around the pile, especially the squeezing effect after soaking. The results show that the stress of squeezing soil is continuously decayed and the water immersion causes further decay, and the final stability value is related to the confining pressure. The soil around the pile is consolidated under the effect of soil compaction until stable, Increase.