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以重庆地区侏罗系中统沙溪庙组红层泥岩为研究对象,通过侧限无荷膨胀和有荷膨胀室内试验,研究了侧限无荷、有荷及不同加水条件下的膨胀性能。结果表明,红层泥岩侧限无荷膨胀呈现3个膨胀变形阶段,第1阶段膨胀变形较快,膨胀量较大,第2阶段膨胀具有增速特征,95%的膨胀量在前2个阶段完成;竖向荷载对红层泥岩侧限膨胀变形的抑制作用明显,随着竖向荷载的增大,侧限有荷膨胀率急剧降低;侧限无荷条件下,短时间内,初期的水量大小对泥岩膨胀性能影响不明显,但随着时间持续,水量大小对稳定膨胀量、膨胀变形过程及其特征起着控制作用。
Based on the red beds and mudstones of the Shaximiao Formation in the Jurassic of Chongqing Municipality, the expansive properties under confined unloaded, loaded and water-added conditions were studied by confined unloaded and unloaded indoor tests. The results show that there are three stages of unconfined expansion of the mudstone in the red mudstone, three stages of expansion and deformation are observed in the red mudstone, the first stage of expansion and deforming is faster, the larger the amount of expansion, the second stage of expansion has the characteristics of increasing velocity, and the 95% . The vertical load has a significant inhibitory effect on the lateral deformation of the red mudstone. With the increase of the vertical load, the lateral load expansion rate decreases sharply. Under the unconfined condition, the initial amount of water The size has no obvious effect on the expansion performance of mudstone. However, as time goes on, the amount of water plays a controlling role in the process of stable expansion, expansion and deformation and its characteristics.