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以钠基膨润土为充填介质,水泥砂浆为裂隙壁制作充填裂隙,采用法向压缩、侧向约束的方式,对不同宽度和不同含水率条件下膨胀性充填裂隙的本构关系进行了探讨,获得了大量应力、应变实验数据。研究表明,膨胀性充填裂隙峰前本构关系可划分为3个阶段:流变阶段、压密阶段和弹性阶段。实验开始时,充填裂隙即进入流变状态,也就是说应力基本保持不变,而应变持续增加,随着有限变形及法向应力的增加,充填裂隙整体强度增大,逐渐表现出弹性特征。根据实验数据和特征,提出倒圣维南体(inverted Saint-Venant body)力学模型,建立了膨胀性充填裂隙本构方程,并分析了其内在作用机制。
Taking sodium bentonite as filling medium and cement mortar as filling crack in crack wall, the constitutive relation of swelling fissure with different width and different water content was studied by means of normal compression and lateral restraint. A large number of stress and strain experimental data. The results show that the constitutive relationship of the infilled fissure before fracture can be divided into three stages: rheological stage, compaction stage and elastic stage. At the beginning of the experiment, the fissure was filled into the rheological state, which means the stress remained unchanged and the strain continued to increase. With the increase of the finite deformation and the normal stress, the overall strength of the fissured crack increased and gradually showed elastic characteristics. According to the experimental data and characteristics, a mechanical model of inverted Saint-Venant body is proposed, and a constitutive equation of swelling-filled fracture is established and its intrinsic mechanism is analyzed.