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问题 单项选择题

某场地为均质软塑黏土场地，土层γ=19kN/m3，qs=10kPa，fak=150kPa，采用粉体喷搅法处理，桩径为600mm，桩距为1.2m，正方形布桩，桩长为10m，桩间土承载力折减系数为0.5，桩端天然地基土承载力折减系数为0.6，桩体材料fcu=2.7MPa，桩身强度折减系数为0.30，按《建筑地基处理技术规范》计算。

复合地基承载力为（）。

A. 189kPa

B. 199kPa

C. 209kPa

D. 219kPa

答案

参考答案：C

解析：

①单桩承载力

=213.8(kN)

取Ra=213.8kN≈214kN

②复合地基承载力

de=1.13s=1.13×1.2=1.356(m)

多项选择题 案例分析题

女性，28岁，孕5个月，第一胎，近几周自觉腹部增长较快，前来检查。

提示：B超提示：双胎妊娠。该孕妇妊娠期容易出现的并发症有哪些？（）

A.早产

B.胎膜早破

C.贫血

D.妊娠高血压疾病

E.羊水过多

F.羊水过少

G.过期妊娠

H.胎儿生长迟缓
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填空题

For millions of years, the changes in Earth’s climate have been driven by forces of nature. But for the last century and a half, Earth’s average temperature has been rising (47) than any time in the past ten thou- sand years. The (48) in science is that much of that change has been driven by us.
The climate is not what it used to be. It’s not your grandfather’s climate anymore.
The (49) are everywhere: droughts in the American Southwest and Africa’s Sahara(撒哈拉), (50) seas in Louisiana and Bangladesh (孟加拉国), tropical diseases spreading north and extremes of weather from Florida to France.
There are people who still say global warming needn’t (51) us. If it’s happening at all, it’s a natural trend, not much we can do about it. But there is now hard (52) which shows that the warming is not only real. It’s (53) . It’s altering the climate’s most basic elements like rainfall and evaporation, days of sunshine and nighttime temperatures. Those changes are (54) the environments in the agricultural production, (55) wild species with extinction and putting at risk our life styles, our health, and some of our favorite cities by the sea. We’ll follow the signs and see who i f anyone is responsible. We’ll meet scientists who are (56) new climate evidence and we’ll see what we can do to help.

  • A) worryF) signs K) faster
  • B) risingG) vastL) consensus
  • C) troublesH) investigating M) threatening
  • D) quicklyI) dangers N) damaging
  • E) evidenceJ) acceleratingO) concern
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