Comparative Study on Application of Chinese and Foreign Codes in Port Engineering Survey
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摘要: 从港口工程项目勘察的角度,针对勘察工作量的布置、钻探和取样、岩土分类、标准贯入试验、静力触探试验、十字板剪切试验、强度参数的选取及单桩竖向抗压承载力计算等方面,对中、欧、美国标准进行了对比研究,得出在钻探和取样、静力触探试验、十字板剪切试验等方面,三种标准是相通的,但在工作量布置、岩土分类、标准贯入试验的成果应用、强度参数的选取及单桩竖向抗压承载力计算等方面存在差异,研究成果可供参考借鉴。Abstract: From the perspective of port engineering project survey, a comparative study of Chinese, European and American codes was conducted, including survey workload, drilling and sampling, geotechnical classification, SPT, CPT, VST, strength parameter selection and calculation of vertical compressive bearing capacity of single pile. In these codes, drilling and sampling, CPT, VST are similar, but there are differences in workload, geotechnical classification, application of SPT results, selection of strength parameters and calculation of vertical compressive bearing capacity of single pile. The research results could be used as reference.
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表 1 中、欧、美勘察阶段划分
表 2 JTS 133—2013中粒组划分
mm 漂石(块石) 卵石(碎石) 圆砾(角砾) 砾砂 粗砂 中砂 细砂 粉砂 粉粒 黏粒 >200 20~200 2(>50%)~20 2(25%~50%) 0.5~2(<25%) 0.25~0.50 0.075~0.25 0.075(50%~85%) 0.005~0.075(<50%) <0.005 表 3 Eurocode 7中粒组划分
mm 岩块 碎石 粗砾 中砾 细砾 粗砂 中砂 细砂 粉粒 黏粒 >200 63~200 20~63 6.3~20 2~6.3 0.63~2 0.2~0.63 0.063~0.2 0.002~0.063 <0.002 表 4 ASTM D2487-11中粒组划分
mm 漂石 卵石 粗砾 细砾 粗砂 中砂 细砂 粉粒 黏粒 >300 75~300 19~75 4.75~19 2~4.75 0.425~2 0.2~0.425 0.075~0.2 0.005~0.075 表 5 中、欧、美标准中标准贯入试验设备规格
表 6 中、欧、美国标准中十字板剪切试验对比
表 7 JTS 167—2018推荐的抗力分项系数
桩型 静载试验法 经验参数法 打入桩 1.3~1.4 γR 取1.45~1.55 灌注桩 1.5~1.6 γR 取1.55~1.65 嵌岩桩 1.6~1.7 覆盖层γcs 预制型1.45~1.55 灌注型1.55~1.65 嵌岩段γcR 1.7~1.8 表 8 Eurocode 7推荐的抗力分项系数
桩型 抗力分项系数 集合 R1 R2 R3 R4 打入桩 端阻力γb 1.0 1.1 1.0 1.3 侧阻力γs 1.0 1.1 1.0 1.3 总承载力γt 1.0 1.1 1.0 1.3 钻孔灌注桩 端阻力γb 1.25 1.1 1.0 1.6 侧阻力γs 1.0 1.1 1.0 1.3 总承载力γt 1.15 1.1 1.0 1.5 螺旋钻孔桩 端阻力γb 1.1 1.1 1.0 1.45 侧阻力γs 1.0 1.1 1.0 1.3 总承载力γt 1.1 1.1 1.0 1.4 表 9 API推荐的安全系数
设计极端环境条件与相应
钻井荷载的组合工况设计工作环境条件
(钻井操作时)设计极端环境与相应
生产荷载的组合工况设计工作环境条件
(生产操作时)设计极端条件与最小
荷载(计算上拔力)的组合工况1.5 2.0 1.5 2.0 1.5 -
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