Ground disturbance caused by shield tunnelling in a stiff, overconsolidated clay

摘要: Abstract Attewell, P.B. and Farmer, I.W., 1974. Ground disturbance caused by shield tunnelling in a stiff, overconsolidated clay. Eng. Geol., 8: 361–381. Some of the factors affecting ground deformation around excavations stiff clays are considered. There is particular reference throughout paper to an analysis interpretation measured 4.146-m diameter, hand-excavated, shield-driven tunnel at nominal axis depth 29.3 m London Clay. The maximum surface settlement was found, precise levelling, be 6.1 mm but shape transverse profile conformed normal probability curve only up time passage. Of contributory losses tunnel, yield clay face appears dominate extent generating 50% eventual settlement. Measurement evidence suggests rate that 2 3 times radial over implies about one-fifth could attributed into grouted sections erected lining.