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POWDERHORN COAL COMPANY <br />TABLE 20-3 <br />• TOLERANCE OF STRUCTURES OF DIFFERENTIAL SUBSIDENCE <br />(Hutchings, et al. 1978) <br />DIFFERENTIAL STRUCTURAL SIGNIFICANCE <br />SUBSIDENCE <br />0.1 % Limiting value for high continuous brick walls and brick- <br /> clad column frames <br />0.1%-0.2% Single story brick mill building, wall cracking <br />0.2%-0.4% Limiting value for steel and reinforced concrete frames <br />0.7% Structural damage to building <br />0.8% Slight damage to 2'/z story brick veneer homes <br />2% Severe damage to 2'/z story brick veneer homes <br />0.4% Industrial reinforced concrete buildings of monolithic <br /> construction or with gantry cranes, churches with domes <br />• and other big buildings for public use such as hospitals, <br /> theaters, etc., river beds and water reservoirs provided the <br /> hydro-geologic opinion is that the character of the ground <br /> does not require any increase or decrease of safety <br /> conditions, main railway lines and railway stations with a <br /> quantity of technical equipment, tunnels and arched <br /> bridges, main water pipes, also large residential buildings <br /> with a length of more than 20 m. <br />0.6% Main roads, railway tracks and small railway stations <br /> girder bridges, industrial buildings of brick, steel and <br /> timber construction without cranes and which are not too <br /> susceptible to ground movements, cooling towers, high <br /> chimney stacks, water towers, churches with beam <br /> construction roofs, residential buildings with a length of 10 <br /> to 20 m, residential buildings more than 20 m long, <br /> residential buildings more than 20 m long, but of a <br /> specially protected construction, main sewers and airfields. <br />0.9% Large sports stadiums, residential buildings up to 10 m <br />long, residential buildings 10 to 20 m of a specially <br />protected construction and other items of small <br />• importance. <br />POLISH MINISTRY FOR MINING AND POWER CLASSIFICATION <br />OF PERMISSIBLE STRAINS (OCHAB, 1961) <br />z <br />