摘要
【目的】根据渠道地基的运行特点,对浸水条件下的膨胀土渠道地基进行离心模拟试验。【方法】将模型离心加速度增加到60g,然后浸水并保持水头8.5 cm,再用各种传感器测量浸水过程中模型的表面位移、内部土压力和吸力。【结果】在上覆水压力作用下,膨胀土先发生压缩,然后由于水分浸入发生轻微膨胀,并导致侧压力系数逐渐增大。试验后对模型含水量和干密度的测定表明,模型内形成了含水量梯度,干密度随深度逐渐增加而增大。【结论】模型变形和内部土压力变化是模型内部含水量变化的结果,同时也受上覆压力影响;基质吸力主要与含水量有关,受重力加速度变化的影响较小。
【Objective】 According to the characteristics of canal foundation,a centrifuge test was conducted to model the behavior of foundation upon wetting.【Method】 The model was firstly accelerated to 60 g and then infiltrated from the model surface with a constant water head of 8.5 cm.The surface settlement,earth pressure and suction were monitored with various transducers.【Result】 Settlement was firstly observed due to the water pressure acting on the model surface,and then slight expansion occurred due to infiltr...
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2010年第9期229-234,共6页
Journal of Northwest A&F University(Natural Science Edition)
基金
水利部"948"计划技术创新与转化项目(CT200408)
国家"十一五"科技支撑计划项目(2006BAD11B03)
关键词
离心模型试验
非饱和土
膨胀土
基质吸力
centrifuge test
unsaturated soil
expansive soil
matrix suction
