Česká geologická služba
Projekt Mokrsko
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Location of works

The research works is taking place both in the laboratory and in the field. While the laboratory research is carried out at workplaces of organizations participating in the project, the field studies is undertaken in the Josef experimental adit ca 50 km south of Prague. This approximately 20-year-old mine workings currently have the status of a research unit and a natural laboratory, operated by the Centre of Experimental Geotechnics of the Technical University in Prague.
The adit penetrates weakly metamorphosed volcanic rocks of the so-called Jílové Belt at the contact with granodiorites to tonalites (for the simplicity only "granites" or "granitoids", popularly referred to as "granite") of the Central Bohemian Plutonic Complex, ~ 360-340 million years old. A section of the adit was chosen that meets the designed tests. It is located about 1.5 km from the adit mouth and is covered by about 120 m thick rock overburden. The underground site meets all the conditions of operation and is in accordance with safety regulations of the local Mining Authority.
The investigation is carried out in the area of the working face of drift SP-47 - see below - and in the adjacent rock massif to a depth of about 5 m. This part of the Josef adit runs through deformed and faulted/fractured granitic rocks penetrated by dense swarms of parallel quartz veinlets. The fracturing is both of natural origin as well as arised from the excavations and drifting of underground workings by blasting. This environment was chosen deliberately because during the industrial use of underground space and constructions in granitoids some inhomogeneity and disturbance are expected to exist even in rock mass assumed to be homogeneous judging from the exploration and survey carried out on the surface.

Experiment localization

Red ellipse marks the localization of in-situ experiment in the Josef adit, Mokrsko-West.