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Table A5. Classication of Permissible Strain and Tilt <br />(Ochab, 1961) <br />POLISH MINISTRY FOR MINING AND POWER <br />PERMISSIBLE TYPE OF STRUCTURE OR SERVICE <br />HORIZONTAL TILT <br />STRAIN (°) <br /> <br />0.2% 0.142° Gas mains which require particular protection against the danger of a <br />(2000µs) gas explosion if damaged, also items such as water tanks and industrial <br /> installations recognized as being especially important or particularly <br /> susceptible to damage with regard to life and safety <br />0.4% 0.283° Industrial reinforced concrete buildings of monolithic construction or with <br />(4000,us) gantry cranes, churches with domes and other big buildings for public use <br /> such as hospitals, theaters, etc, river beds and water reservoirs, provided <br /> the hydro-geological opinion is that the character of the ground does not <br /> require any increase or decrease of safety conditions, main railway lines <br /> and railway stations with a quantity of technical equipment, tunnels and <br /> arched bridges, main water pipes, also large residential buildings with a <br /> length of more than 20 m <br />0.6% 0.567° Main roads, railway tracks and small railway stations, girder bridges, <br />(6000,us) industrial buildings of brick, steel and timber construction without cranes <br />and which are not too susceptible to ground movements, cooling towers, <br />high chimney stacks, water towers, churches with beam construction <br />roofs, residential buildings with a length of 10 to 20 m, residential buildings <br />more than 20 m long, but of a specially protected construction, main <br />sewers and airfields <br />0.9% 0.858° Large sports stadiums, residential buildings up 10 m long, residential <br />(9000µs) buildings 10 to 20 m long buildings of a specially protected construction <br />and other items of small importance <br />