Temperature is one of the factors influencing the behavior of the rocks from the geomechanical point of view. The development of the heating of the sample is described in the paper as well as the effect of the temperature on the basic properties of granites


The behavior of rock under high thermal conditions IS an important issue, which can influence the design of underground structures to a large extent specially When the rock mass undergoes thermal loading as in case of underground nuclear waste repositories.

World-over scientists are working to find out the Physical, mechanical and thermal properties of various rocks which could be the possible host for nuclear Waste. Granites are also considered as a good host media. At least nine countries around the world are studying granites as the host rock.

A collaborative project is being carried out between the Central Mining Research Institute (CMRJ), India and the Institute of Geonics, Czech Republic under the bilateral programme of Council of Scientific & Industrial Research (CSTR), India and Academy of Sciences of Czech Republic on "Geological and geotechnical aspects of underground repositories". The work presented in the paper has been carried out in the project.

Petrological details of Indian granite

This particular Indian biotice-amphibolite granite under study is pink in colour, medium grained (mean gram size ~ 2.6 mm), epigranular, hypidiomorphic texture and homogeneous structure. A microscopic view of thin section of the granite is shown in Figure 1

(Figure in full a paper)

Petrological details of Czech granite The grey coloured biotite-microcline granite is medium grained (mean grain size ~ 1,7mm), epigranular, hypidiomorphic texture and homogeneous structure. A microscopic view of thin section of the granite is shown in Figure 2. The composition of Indian and Czech granites is shown in Table I. On comparing the two granites (Figs. I, 2), it is clear that the Indian granites are coarser than Czech granites.

Table I shows that the biotite in Indian granite is 1.5 per cent, whereas in Czech granites it is 7.0 per

(Figure in full a paper)


The rock core specimens from India were of 58 mm diameter and that of Czech were 46 mm and 36 mm diameters. A study was carried out to obtain the time required for heating the specimen up to its centre. For this a drill hole was drilled longitudinally in the centre of the core and a thermo-couple was inserted. The oven, as shown in Figure 3, (or herein after called ‘environmental chamber’) was pre-heated to the desired temperature. Once the temperature in the environmental chamber is achieved, the core specimens fitted with thermo-couple were kept inside the chamber. The temperature of specimen is noted at regular interval. The study has been carried out at two temperatures, 100 °C and 200 °C, and the results are presented in Figures 4, 5.

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