变形模量压缩模量(国外英文资料).doc

变形模量压缩模量(国外英文资料) Deformation modulus Definition: the deformation modulus of soil is the compressibility index was obtained by load test on site, in part, under the condition of confining stress increment and the ratio of the corresponding strain increment. It can actually reflect the deformation characteristics of the natural soil. Its shortcomings is heavy load test equipment, lasted longer and more, and deep soil load test is technically very difficult, so often need to according to the compression modulus to estimate the modulus of deformation of soil. The difference between compression modulus and elastic modulus The compression modulus of soil, under the condition of confining completely, the vertical additional stress increment of soil and the corresponding strain increment ratio, it can be obtained from indoor compression test. Elastic modulus of soil: the elastic modulus of soil is different according to the method of measurement, which can be classified as static and die and moving die. The static shell is measured by a static triaxial instrument. The modulus of elasticity is the ratio of stress and strain on the curve. Move mode, indoor dynamic triaxial apparatus measured are available, and after the soil consolidation, hierarchical, dynamic stress is applied to the vibration of the undrained tests, keeps constant dynamic stress amplitude and vibration frequency depending on the actual engineering conditions can be described by hyperbolic equation, also known as the tangent modulus. The deformation modulus and compressive modulus of soil are important indicators of the compressibility of soil and the calculation of the compressive deformation of the foundation. Due to the difference of the lateral conditions under compression, the difference between the two models of the same soil under the same compressive stress is obviously very different. The experimental methods of three kinds of modulus are different in stress condition and deformation condition. Th