單項選擇題建筑基樁現(xiàn)場檢測采用單樁豎向抗壓靜載試驗,當(dāng)荷載一沉降曲線呈緩變型時,加載至樁頂總沉降量為()即可終止加載。()

A.40~60mm
B.60~80mm
C.80~100mm
D.30~40mm