第6题: [单项选择]某天然地基土体不排水抗剪强度cu为23.35kPa,地基极限承载力等于5.14cu,为120kPa。采用碎石桩复合地基加固,碎石桩极限承载力可采用简化公式估计,ppf=25.2cu;梅花形布桩,桩径为0.80m,桩中心距为1.40m。设置碎石后桩间土不排水抗剪强度为25.29kPa。破坏时,桩体强度发挥度为1.0,桩间土强度发挥度为0.8。由此,碎石桩的极限承载力为()。 A. ppf=588kPa B. ppf=613kPa C. ppf=637kPa D. ppf=490kPa 参考答案:C
第32题: [单项选择]What is the talk mainly about ?() A. The impact of enzymes on chemical reactions. B. The way the body produces enzymes. C. The structure of enzymes. D. Types of chemical products created with enzymes. 参考答案:A