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Technical University of Munich

Research Group „Experimental geotechnics, soil mechanics“

Contact:

Dr.-Ing. Emanuel Birle

Dr.-Ing. Stefan Vogt

Combined analysis on creep and ageing effects in granular material

Surface profile and roughness of a sand grain

Observation of macroscopic time effects of granular soils

Creation of an experimental and mathematical basis for the simulation of the time-dependent behaviour of granular materials

Microscopic processes as a cause of creep and ageing

Time dependent deformation behaviour of sands

open cast mine

Time-dependent deformation behaviour of opencast mining dumps from sands

Investigation based on laboratory tests and field
measurement data

Observation of the basic soil mechanical behaviour and transfer to field measurement data as well as mathematical models for deformation description

Effective stress and peak friction angle of an as-compacted silty sand at very low stress state

Suction induced effective stress Dp’0 and stress obliquity Mpeak at very low stress states derived from unconfined compression tests [1] and uniaxial tensile tests [2]

Results for samples compacted at wcomp. = 2.2 % - 8.9 % to ID = 0.69

Secant peak friction angle vs. suction
Suction induced effective stress vs. suction
Bishop’s effective stress parameter c and best-fit

The improvement effect is obtained because soil water is absorbed by the dry, porous recycling material. It has been investigated and confirmed through extensive expermental testing. A simple mathematical model for the development of the compaction properties of the treated soils, and a proposed list of suitability tests has been made available.

 

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