单项选择题

当满堂或共享空间模板支架立柱高度超过（ ）时，若地基土达不到承载要求，无法防止立柱下沉，则应先施工地面下的工程，再分层回填夯实基土，浇筑地面混凝土垫层，达到强度后方可支模。
A、2m
B、4m
C、6m
D、8m

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