Establishing method of coarse-grained-soil nonlinear elastic constitutive model

Abstract

The invention discloses an establishing method of a coarse-grained-soil nonlinear elastic constitutive model. A large conventional triaxial solidification water-draining shear mechanical test result is used as a basis and relative compaction and damage ratio are used as media to establish the coarse-grained-soil nonlinear elastic constitutive model by combining with a unified disturbance degree function through deviatoric stress-axial strain relation curves, volumetric strain-axial strain relation curves, relative compaction-initial tangent modulus relation curves and relative compaction-peak stress relation curves under different confining pressures under different relative compaction conditions. The model has higher accuracy and wide usability and can be used for research and analysis on coarse-grained soil mass mechanical characteristics in actual geotechnical engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a method for constructing a nonlinear elastic mechanics constitutive model of a coarse-grained soil material. Background technique [0002] As a geological product with a long history, coarse-grained soil has properties such as elasticity, plasticity, rheology, nonlinearity and anisotropy. With the rapid development of my country's economy, the continuous construction of water conservancy facilities and large-scale infrastructure such as ocean platforms, breakwaters, high earth-rock dams, expressways (railways), airport runways, bridge piers, nuclear power plants, etc., coarse-grained soil The material is widely used; at the same time, coarse-grained soil is also used in geotechnical engineering problems such as deep foundation pit engineering and the treatment of weak foundations of buildings, which has played a huge role in ensuring engineering safety. Coarse-grained s...

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Problems solved by technology

[0004] In fact, in actual civil engineering construction, large-scale mechanical action will cause disturbance of coarse-grained soil, which will change the volume of the soil, thereby changing the moisture content and pore water pressure of the soil near the construction site, and even changing the stress distribution of the soil. , causing structural changes in the soil and causing soil damage

However, the Duncan-Chang model does not consider the change of soil physical parameters under disturbance in actual engineering.

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