压力对膨胀土膨胀性的影响分析

在压缩仪上对原状膨胀土进行浸水饱和膨胀变形试验，分析了不同压力下的膨胀率、卸载回弹稳定后的无荷膨胀率以及超固结程度对膨胀率的影响。结果表明:压应力对膨胀率有较大的抑制作用，压应力越大，膨胀率越小；膨胀土经过不同的预压应力后，其无荷膨胀率有明显减弱，当大于前期固结压力后，受其影响较小；膨胀土的膨胀率受固结压力的影响较大，当固结压力大于前期固结压力，膨胀率增大明显。

Analysis on the Influence of Pressure on Expansibility of Expansive Soil

Expansion factor under different pressures,no-load expansion factor after unload resilience stability,and the influence of over-consolidation degree on expansion factor are analyzed by carrying out soaking saturation expansive deformation test on original expansive soil with compression meter.The conclusion shows that compressive stress has major suppression on expansion factor.The greater compressive stress leads to smaller expansion factor.Through different precompression stresses,no-load expansion factor of expansive soil is reduced obviously.When precompression stress is greater than pre-consolidation pressure,it has little influence on expansion factor.Consolidation pressure has major influence on expansion factor of expansive soil.When consolidation pressure is greater than pre-consolidation pressure,expansion factor is largely increased.