The ultimate bearing capacity of shallow foundation refers to ( ).

A、Theloadinthefoundationwhentheplasticzonewillappearbuthasnotyet
B、Theloadinthefoundationwhenthemaximumdepthatwhichtheplasticzoneis1/4ofthewidthofthefoundation
C、Theloadinthefoundationwhenthemaximumdepthatwhichtheplasticzoneis1/3ofthewidthofthefoundation
D、Theloadinthefoundationwhenthesoiloccursgeneralshearfailure