Whereas the concept that the weathered rocks show high porosity and these developed pores in rocks control the compressive strength has been accepted, this paper has attempted to check the effects of different water content and temperature conditions of rocks to compressive strength.
In general, in side of pore space, there exist some amount of water as different forms, which mainly depends on temperature. In this study, we chipped rock samples out of weathered tuffaceos sandstone bed rock, and temperature conditions using laboratorical methods. After processed test samples, we measured compressive strength and other properties of each sample. These tests show some interesting results as following short summary sentences;
1) The compressive strength of weathered rock is controlled by the volume and shapes of pores, and materials which occupy the space of pores.
2) If the contained water in pores is frozen, the less amount of water rocks contain, the larger compressive strength value rocks have.
3) If water in pores is frozen, compressive strength of rocks is 3-4 times larger than unfrozen condition.
4) Under the frozen condition, compressive strength value increases in proportion to lowering the temperature below 0°C.
It is hoped that the stringency concerning about the strength of weathered rocks in cold regions should be confirmed by the study about pores and materials in pores of rocks in laboratorical works and on-the-spot-investigations.