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• Table 10. <br />TOLERANCE OF STRUCTURES TO DIFFERENTIAL SUBSIDENCE (Hutchings, et, al., 1978) <br />• <br />DIFFERENTIAL <br />SUBSIDENCE STRDCTURAL SIGNIFICANCE <br />O.1Z Limiting value for high continuous brick vans and <br /> brick-clad column frames <br />O.1Z-0.2Z Single storey brick mill building, wall cracking <br />0.2Z-0.4Z Limiting value for steel and reinforced concrete frames <br />O.7Z Structural damage to buildings <br />0.8Z Slight damage to 2'~ storey brick veneer homes <br />2Z Severe damage to 211 storey brick veneer homes <br />POLISH MIIIISTRY FOR MINING AND P047ER <br />CLASSIFICATION OF PERMISSIBLE STRAINS (OCHAB, 1961) <br />PERMISSIBLE I TYPE OF STRUCTURE OR SERVICE <br />HORI20NTAL <br />0.2Z Cas mains which require particular protection against <br />the danger of a gas explosion if damaged, also items <br />such as eater tanks and industrial installations <br />recognised as being especially important or particularly <br />susceptible to damage with regard to life and safety <br />0.4Z 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 />theatres, ece, river beds and eater reservoirs provided <br />the hydro-geological opinion is that the character of <br />the ground does not require any increase or decrease <br />of safety conditions, main railway lines and railway <br />stations with a quantity of technical equipment, tunnels <br />and arched bridges, main vacer pipes, also large <br />residential buildings with a length of metre than 20 m <br />0.6Z 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 coo <br />susceptible to ground movements, cooling Covers, high <br />chimney stacks, vacer covers, churches with beam <br />construction roofs, residential buildings with a length <br />of LO to 20 m, residential buildings more than 20 m <br />long, but of a specially protected construction, main <br />severs and airfields <br />0.9Z Large sports stadiums, residential buildings up co LO m <br />long, residential buildings 10 to 20 m long of a <br />specially protected construction and other items of small <br />importance <br />• <br />