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[单选题]
按《岩土锚杆(索)技术规程》规定,岩土锚杆设计时,锚杆锚固段上的覆土层厚度不宜小于()。
A.2.5m
B.3.5m
C.4.5m
D.5.5m
查看答案
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A.2.5m
B.3.5m
C.4.5m
D.5.5m
A.小于1.25mm
B.小于2.0mm
C.小于2.5mm
D.小于5.0mm
A.100mm×100m×100m
B.150mmΦ150mm
C.200mm×200mm×200mm
D.150m×150mm×150mm
E.100mmΦ100mm
A.土层中锚杆长度不宜小于11m
B.土层中锚杆自由段长度不应小于5m
C.锚杆注浆固结体强度不宜低于15MPa
D.预应力锚杆的张拉锁定应在锚杆固结体强度达到设计要求强度的70%后进行
A.-50mm~50mm
B.0~100mm
C.-100mm~100mm
D.100mm~150mm
A.10mm~50mm
B.10~40mm
C.10mm~30mm
D.5~45mm
A.20
B.50
C.60
D.100