Deep circular diaphragm wall shafts are commonly used in tunnel construction and pipe-jacking.While the arching effect of a circular diaphragm wall shaft enhances its stability,there is currently no estab-lished calculation method specifically for circular diaphragm wall shafts.In this paper,a method for analyzing the overturning stability of circular diaphragm wall shafts considering the circumferential resistance is proposed.The key aspect of this method is to determine the circumferential resistance value.The analysis shows that fac-tors such as vertical joints between panels,circumferential eccentric loads,and the actual shape of diagram walls all have significant impacts on the circumferential resistance value.The influence of these factors must be considered when calculating circumferential resistance.Since the circumferential resistance is solely depended on the structural strength of the circular diaphragm wall shaft itself and does not take into account the beneficial influences of the arching effect on the active and passive earth pressures or the shape of the failure surface,this calculation method is conservatively safe.
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