STABILITY OF SLURRY TRENCHES
摘要
THE NUMERICAL EVALUATION OF THE STABILITY OF THE SLURRY TRENCHES MOST COMMONLY USED UP TO NOW IS BASED ON THE ASSUMPTION OF THE EXISTANCE OF A MEMBRANE ALONG THE WALL ON WHICH THE LIQUID PRESSURE IS ACTING. THEORETICAL CONSIDERATIONS AS WELL AS EXPERIMENTAL TESTS ON MODELS AND IN-SITU REVEALED, HOWEVER, THAT THE ASSUMPTION MENTIONED ABOVE IS NOT ALWAYS CORRECT. IF CAN BE OBSERVED THT A PENETRATION OF THE SLURRY INTO THE VOIDS OF THE SOIL TAKES PLACE. THE PENETRATION IS GOVERNED MOSTLY BY THE MUTUAL CONDITIONS OF GRAIN SIZE DISTRIBUTION AND THE STAGNATION PRESSURE GRADIENT OF THE SUSPENSION. THESE CONDITIONS IMPLY THAT HYDROSTATIC PRESSURE IS ACTING IN THE VOIDS OF THE SOIL ADJACENT TO THE TRENCH. THIS PAPER ATTEMPTS TO PROVE THIS. INVESTIGATIONS INTO THE STABILITY OF THE SINGLE GRAIN INSIDE THE EARTH WALL LEAD TO ADDITIONAL CONSIDERATIONS FOR THE SAFETY OF SLURRY TRENCHES. SOME METHODS ARE PRESENTED FOR TESTING THE RELEVANT PARAMETERS IN THE LABORATORY AS WELL AS ON THE SITE. /TRRL/