圈梁遇洞口中断,所设的附加圈梁与原圈梁的垂直距离为h时,其相互搭接长度应满足()

A.≤4h且≤1500mm

B.≥4h且≥1500mm

C.≤2h且≤1000mm

D.≥h且≥1000mm