Research of the Behavior of Clay Materials with Double Porosity

Hynek Lahuta,Luis Pais

doi:10.3390/su13063219

Abstract

This contribution presents results from a series of compression and undrained triaxial tests to study the mechanical behavior of dump clay from the north of Bohemia. The use of these materials as a foundation for construction can’t be achieved without the adoption of some precautions. This comes from embankment, formed by digging the ground (altered claystone), up to the level of coal mining which is in a sub horizontal stratigraphic layer. A potential static liquefaction behavior was observed in undrained tests for high confinement stress. A structural collapse was noticed with the results obtained in the triaxial test. This collapse is characterized by an unexpected large decrease in deviator and mean effective stress. The soils formed have strength properties that are potentially dangerous. These concepts can improve the use of these kinds of soils in geotechnical engineering work. It continues and expands the results obtained in previous research, especially the future problematic use of these materials as the foundation soil for line or building structures.

Highlights

The basic literature important for the topic of this article is represented by the authors [1,2,3,4]
The purpose of this paper is to review some of the laboratory test data performed in dump clay from North Bohemia with the aim of understanding better the mechanics of these materials
Particle size distribution and consistency test showed that the clay dump belongs to the CL group, S2 is a silty clay and S3 a sandy clay, which can be described as inorganic clay of low to medium plasticity with normal or low clayey activity (0.56 to 0.58)

Summary

Introduction

The basic literature important for the topic of this article is represented by the authors [1,2,3,4]. They have investigated the fundamental mechanics of sands and clays in triaxial and oedometer apparatus and found similar behavior with the mechanical shape of curves with simple frameworks. The purpose of this paper is to review some of the laboratory test data performed in dump clay from North Bohemia with the aim of understanding better the mechanics of these materials. Static liquefaction and instability have similar effective stress paths and are associated with large increases in pore pressure promoting mechanisms of strain softening [5]

Objectives

Results

Conclusion