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土冻结过程中,冰胶结作用使周围土体颗粒与建(构)筑物基础联成一体,这种胶结力称为土与基础间的冻结强度,通常采用冻土沿物体(例如基础材料)表面的剪切强度来度量。因而,冻土与基础接触面的应力-应变关系及其强度特征是确定冻土区基础工程承载力、抗拔性能和分析构筑物与冻土相互作用的基础和关键。为了更好地服务于工程实际,通过大量的冻结粉土与混凝土基础接触面剪切试验,总结了冻土接触面的基本力学特征和受力变形规律。根据获取的剪应力-位移曲线和冻结粉土接触面强度变化规律,利用标准本构模型建模方法,建立了冻结粉土接触面应力-位移-温度本构方程。该模型可以较好地描述不同温度冻结粉土接触面应力-位移变化规律,并为冻土区构筑物受力和变形数值计算提供基础。
During the freezing process of soil, the effect of ice cementation makes the particles of the surrounding soil integrate with the foundation of the building (structure), which is called the freezing strength between soil and foundation. Usually, the frozen soil is used along the object (for example, basic material) Surface shear strength to measure. Therefore, the stress-strain relationship and its strength characteristics of the contact surface between permafrost and foundation are the basis and key to determine the bearing capacity and anti-pull performance of foundation engineering in permafrost area and to analyze the interaction between structure and frozen soil. In order to better serve the engineering practice, the basic mechanics characteristics and stress and deformation laws of the contact surface of frozen soil are summarized through a large number of shear tests on the contact surface between frozen silt and concrete foundation. According to the obtained shear stress-displacement curve and the variation of interface strength of frozen silt, the constitutive equations of stress-displacement-temperature of frozen silt contact surface are established by standard constitutive modeling method. The model can well describe the variation of stress-displacement of frozen silt contact surface at different temperatures, and provide a basis for numerical calculation of stress and deformation of structures in frozen soil.