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一,前言天津新港所建码头多采用高桩承台式,自解放以来,共打桩不下两万多根。1970年以前多用11—B—3汽锤沉桩,桩较短断面较小,桩尖大多落在粘性土中,桩尖阻力约占桩承载力的30%以下;1970年以后改用MB—40(少量用MB—70)柴油锤沉桩,桩较长断面较大,桩尖落在-20~M 以下的砂性土中,桩尖阻力已达桩承载力的40%。两者的静载试验的 P～S 曲线(P—桩顶荷载;S—桩顶在 P 作
I. INTRODUCTION The terminals built in Xingang Port of Tianjin are mostly made of high-pile caps. Since the liberation, a total of more than 20,000 piles have been piled. Before 1970, multi-purpose 11-B-3 hammer sinking pile, pile shorter section, most of the pile tip falls in cohesive soil, pile tip resistance about 30% of pile capacity below; 1970 after the switch to MB- 40 (a small amount of MB-70) diesel hammer sinking pile, pile longer cross-section larger, pile tip falling in sand soil below -20 ~ M, pile tip resistance has reached 40% of the pile bearing capacity. P ~ S curve of both static load test (P-pile top load; S-pile top in P for