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APPENDIX A. RECOMMENDED LIMITS FOR SUBSIDENCE INDUCED STRAIN AND TILT <br />Table A1. Acceptable Subsidence Damage <br />References: (1) Wagner & Salamon, 1973; (2) Voight & Pariseau, 1970 <br />Horizontal Vertical Tilt Comments and References <br />Strain (µE) Strain (µE) Tan (a) <br />1000 1000 0.0010 0.057° "tolerable level of strain likely to be on <br />500-1000 500-1000 <br />1000-2000 1000-2000 <br />1000 1000 <br />2500-4000 2500-4000 <br />3000 3000 <br />5000 5000 <br />Machine operation limits: <br />0.004 0.229° <br />0.010 0.573° <br />0.003 0.172° <br />0.0002 0.011 ° <br />0.003 0.172° <br />0.01 0.573° <br />to to <br />0.02 1.146° <br />the order of---for high speed <br />hoisting (1) <br />High continuous brick walls <br />damaged (2) <br />One-story brick mill building, wall <br />cracking (2) <br />Plaster cracking (gypsum) (2) <br />Reinforced-concrete building <br />frame damaged (2) <br />Reinforced concrete curtain walls <br />cracked (2) <br />Steel frame, continuous simple steel <br />frame distorted (2) <br />Tilting limits for smoke stacks and <br />towers (2) <br />Rolling of trucks stacking goods (2) <br />Cotton loom (2) <br />Turbo-generator (2) <br />Crane rails (2) <br />Floor drainage problems (2) <br />