A constitutive model for cemented granular materials based on modified Cam-clay model has been developed. The model is capable of predicting the stress-strain response of cemented granular materials subject to mechanical and chemical bond degradation. Two simple variables, the void ratio e and cement content Cc are used to evaluate the mechanical and chemical degradation 'history' of cemented granular materials. Simulation results show the effect of confining pressure, and the change from strain softening to hardening behaviour can be successfully reproduced. Moreover, the model also reproduces the changes of mechanical properties such as strength, bulk modulus and shear modulus due to the increase of void ratio and degradation of bond strength caused by chemical dissolution. Comparisons with experimental data show that the model can capture the stress-strain response of cemented geomaterials subjected to chemical degradation at different stress levels.

In this work, we develop a micro-mechanics inspired constitutive model for lightly cemented granular materials, whose internal variables have a clear physical interpretation. It builds on our previous work, which was able to predict several aspects of the behavior of bonded geomaterials ( e.g. , macroscopic stress-strain responses, localization patterns) but did not explicitly account for porosity nor could it predict dilatancy at low mean stress levels. In the present work, we extend the original formulation by Tengattini (2015), formulating a model that is able to predict the material response across a broad range of mean stress while maintaining the same number of parameters as the original model, all of which have a clear physical interpretation, which helps guide their calibration.

Cemented granular materials play an important role in both natural and engineered structures, as they are able to resist traction forces. However, modeling the mechanical behavior of such materials is still challenging, and most of existing constitutive models follow phenomenological approaches that unavoidably disregard the microstructural mechanisms taking place on the bonded grains scale. This paper presents a multiscale approach applicable to any kind of granular materials with solid bonds between particles. Inspired from the H-model, this approach allows simulating the behavior of cemented materials along various loading paths, by describing the elementary mechanisms taking place between bonded grains. In particular, the effect of local bond failure process on the macroscopic response of the whole specimen is investigated according to the bond strength characteristics.

The process of filling self-compacting cement grout (SCCG) into granular packing without disturbing the granular skeleton culminates in the formation of a well-defined cemented granular materials (CGMs). The inherent attributes of both the cementing matrix and granular packing critically dictate the adhesion behavior and mechanical performance of CGMs. A succession of cement grout flow tests was conducted to elucidate the influence of particle size and the SCCG flowability on SCCG adhesion mechanism within granular packing. Furthermore, the influence of particle size and the cementing matrix volume on the mechanical characteristics of CGMs was scrutinized via uniaxial compressive testing. The results illuminate that the adhesion behavior of SCCG within granular packing is predominantly dependent on the yield stress of SCCG and the average particle size. Additionally, it is established that the peak strength of CGMs is intimately intertwined with the cementing matrix volume and the average particle size, as corroborated by a substantial aggregate of 135 uniaxial compression tests.