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问题 单项选择题

某场地根据勘察资料，0～3m，淤泥质黏土①，fak=130kPa；3～15m粉土②，fak=200kPa；15～18m碎石土③，fak=300kPa；18m以下为基岩④，判定场地类别（）。

A.Ⅰ 

B.Ⅱ 

C.Ⅲ 

D.Ⅳ

答案

参考答案：B

解析：

覆盖层厚度18m。

根据fak估计：①层υ1=140m/s；②层，υs=200m/s；③层，υs=300m/s；④层，υs=800m/s；=0.021+0.06+0.0075=0.0885s；场地为Ⅱ类。

[点评] 根据GB 50011—2001规范表4.1.3，由岩土名称和性状及承载力特征值可估计各土层的剪切波速，然后计算等效剪切波速及覆盖层厚度，判定场地类别。

单项选择题

以下( )种填料按有关规定处理后可以用于路堤填筑。

A．草皮土

B．有机质土

C．腐殖质土

D．生活垃圾
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单项选择题 案例分析题

Happiness can be described as a positive mood and a pleasant state of mind. According to recent investigations, sixty to seventy percent of Americans consider themselves to be moderately happy, one in twenty persons feel very happy. Psychologists have been studying the factors contributing to happiness. It is not predictable nor is a person in an apparently ideal situation necessarily happy. The ideal situation may have little to do with his actual feelings.

A good education and income are usually considered necessary for happiness. Though both may contribute, they are only chief factors if the person is seriously under - educated or actually suffering from lack of physical needs. The rich are not likely to be happier than the middle-in-come group or even those with very low incomes. People with college education are somewhat happier than those who didn’t graduated from high schools, and it is believed that this is mainly because they have more opportunity to control their lives. Yet people with a very high income and a college education may be less happy than those with the same income and no college education.

It should be noted that people quickly get used to what they have, they are happiest when they feel they are increasing their level, no matter where it stands at a given time. The best formula for happiness is to be able to develop the ability to tolerate frustration, to have a personal involvement and commitment, and to develop selfconfidence and to selfesteem.

The second paragraph is written to tell us that（）。

A. happiness is not necessarily connected to one’s situation

B. well -educated people are not happy

C. happiness lies in a good education and a high income

D. the middle -income group are the happiest people
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