A CFD–DEM study on the suffusion and shear behaviors of gap-graded soils under stress anisotropy

Multiscale interactions of elastic anisotropy in unsaturated clayey rocks using a homogenization model

Based on "indentation fracture mechanics" model, this paper offers a model on the crack depth of surface in ceramics grinding. Through carrying out one-way trip grinding and surface crack depth measuring experiments on silicon nitride, a model for silicon nitride grinding surface crack depth is established. In this model, the parameters can be confirmed by the experiment. By the grinding experiment, the parameters of the model can be confirmed, and the controlled grinding surface quality for the ceramic materials can be expected.

Study on the Model of Surface Crack Depth in Ceramics Grinding

General solutions for the displacements, strains, and changes of stress in a transversely isotropic, linear elastic (TILE) half-space subject to a point load were published in 1998. They represent a massive advance on the 19th century solutions by Boussinesq, Cerruti and others which were for fully isotropic, linear elastic (FILE) half-spaces. The 1998 solutions were for loads at a general depth below the surface, and were criticized for being difficult. The present paper deduces more accessible expressions for the special case of loads are on the surface. This allows one clarification and one potential error in the original equations to be identified and avoided. With support from existing data of geological materials, agreement is found with a previous claim that a limit proposed in 1970 on one of the shear moduli for a TILE material is invalid. Corrected equations derived herein can be the basis of calculating ground stresses and movements due to linear responses to distributed surface loads, behaviours of flexible foundations, and stiffnesses for rigid surface footings.

Point loads on the surface of a transversely isotropic linear elastic half-space

Mechanical properties, microstructure and consolidation of sand modified with sodium silicate

Tunnel face stability model for layered ground with confined aquifers

Coupled CFD–DEM Investigation of Erosion Accompanied by Clogging Mechanism under Different Hydraulic Gradients

Elastic shear stiffness anisotropy and fabric anisotropy of natural clays

Since 1991, China implemented the reform of the old age insurance system for urban enterprise employees, the work of establishing a multi-level old-age insurance system has been carried on continuously, and the three-pillar old-age insurance system is developing vigorously. By introducing the development process of China's pension insurance, this paper analyzes the construction process of the three-pillar system, and combined with the current background of China's aging population, puts forward the problems existing in the system, and gives corresponding suggestions, so as to promote the improvement and development of the three-pillar system of pension insurance, and improve China's comprehensive pension capacity.

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Zhen Peng Shi

Papers

Tunnel face stability model for layered ground with confined aquifers

Coupled CFD–DEM Investigation of Erosion Accompanied by Clogging Mechanism under Different Hydraulic Gradients

Elastic shear stiffness anisotropy and fabric anisotropy of natural clays

Current Situation and Suggestion of Three Pillar System of Endowment Insurance in China

Bi-linear strength envelope of coarse- and fine-grained unsaturated soils with bimodal water-retention curve