單項(xiàng)選擇題
某端承灌注樁樁徑1.0m,樁長22m,樁周土性參數(shù)如圖所示,地面大面積堆載P=60kPa,樁周沉降變形土層下限深度20m,試按《建筑樁基技術(shù)規(guī)范》(JGJ94—94)計(jì)算下拉荷載標(biāo)準(zhǔn)值,其值最接近下列()選項(xiàng)。(已知中性點(diǎn)深度Ln/L0=0.8,黏土負(fù)摩阻力系數(shù)ζ=0.3,粉質(zhì)黏土負(fù)摩阻力系數(shù)ζn=0.4,負(fù)摩阻力群樁效應(yīng)系數(shù)ηn=1.0)
A.1880kN
B.2200kN
C.2510kN
D.3140kN