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问题 单项选择题

已知某墙下条形基础，底宽b＝2.4m，埋深d＝1.5m，荷载合力偏心距e=0.05m，地基为黏性土，内聚力ck＝7.5kPa，内摩擦角φk=30°，地下水位距地表0.8m，地下水位以上土的重度γ=18.5kN/m3，地下水位以下土的饱和重度γsat＝20kN/m3。根据理论公式确定地基土的承载力，其结果为（）。

A．230kPa

B．227.1kPa

C．240kPa

D．210kPa

答案

参考答案：B

解析：

因为e＝0.05m＜0.033b＝0.033×2.4＝0.079m，所以可按《建筑地基基础设计规范》(GB 50007—2002)推荐的抗剪强度指标计算地基承载力的特征值。其中φ＝30°＞24°

查《建筑地基基础设计规范》(GB 50007—2002)得

Mb＝1.9，Md＝5.59，Mc＝7.95

地下水位以下土的重度

γ=γsat-γw=20-10=10.0kN/m3

故γm=[18.5×0.8+10.0×(1.5-0.8)]/1.5=14.53kN/m3

则fa＝Mbγb+Mdγmd+Mkck

=1.9×10.0×2.4+5.59×14.53×1.5+7.95×7.5

=227.1kPa

单项选择题

B


Questionnaire


Read the questions and answer YES or No, then you will find out how good you are.
1. When you don’t understand something, you ask questions.
2. You like listening to older people talk about the past.
3. You think that you can learn something interesting from everyone around you.
4. You are brave enough when you have to talk to people you don’t know.
5. You enjoy reading books about famous people.
6. You always see and talk to different people.
7. You are interested in learning new ways of doing things.
8. You enjoy sharing experiences with friends and learning from people of all ages.
9. You talk a lot about yourself.
10. Even if you are often wrong, you make your own decisions.
11. You hate teaching what you are good at: sports, technology, whatever.
12. Your parents don’t understand you, so you don’t talk to them much.
SCORE NOW!
Score 2 points if you answer YES to each of the first 8 questions, and O if you choose NO.
Score 2 points if you answer NO to each of the last 4 questions, and O if you choose YES.
18—24 You are friendly and open-minded. You make people fell important by listening to what they have to say. You’ll probably succeed in learning all kinds of interesting things. Good for you!
10—16 Remember that every single person you know can teach you something. You will greatly make your life rich and colorful.
0—8 About 400 years ago, a famous writer wrote," No man is an island." This is still true today. Try to be more open and interested in people around you.

When you score 22 points, you are ______.

A．shy and nervous

B．silent and serious

C．open and friendly

D．brave and p
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