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强胀缩性是膨胀性岩土的本质特性之一,开展膨胀土三向胀缩试验研究对于全面描述膨胀土湿胀干缩变形规律,合理分析边坡滑坍机理十分重要。利用自主研制的膨胀土三向胀缩测试仪,以宁明灰白色击实膨胀土为研究对象,通过开展三向胀缩系列试验,获得了膨胀土三向胀缩的基本规律。试验表明:干密度和三向应力状态是影响三向膨胀性的重要因素。随干密度的增大,膨胀土三向膨胀的差异性减小,膨胀势增大;应力越大,该方向的膨胀性越小,同时,一个方向应力的增减还将影响到其他方向,而宁明膨胀土三向收缩性差异不大,且与三向应力状态无关。
It is very important to develop a three-dimensional expansive test of expansive soils for a comprehensive description of deformation and deformation of expansive soils. It is very important to analyze the mechanism of sloping slump reasonably. Using self-developed expansive soil three-dimensional expansion and contraction tester, Ningming gray-white compacted expansive soil as the research object, by carrying out the three-dimensional expansion and contraction series of experiments, the expansive soil obtained three-dimensional expansion and contraction of the basic rules. Experiments show that: dry density and three-dimensional stress state is an important factor affecting three-dimensional expansibility. With the increase of dry density, the difference of three-way expansion of expansive soil decreases and the expansion potential increases. The larger the stress is, the smaller the expansibility in the direction is. Meanwhile, the increase or decrease of one direction stress will also affect other directions, And Ningming expansive soil three-dimensional contraction of little difference, and has nothing to do with the three-way stress state.