问题 多项选择题 案例分析题

某市政工程基础采用明挖基坑施工,基坑挖深为5.5m,地下水在地面以下1.5m,坑底黏土下存在承压水层。坑壁采用网喷混凝土加固。基坑附近有高层建筑物及大量地下管线。设计要求每层开挖1.5m,即进行挂网喷射混凝土加固。由于在市区,现场场地狭小,项目经理决定把钢材堆放在基坑坑顶附近;为便于出土,把开挖的弃土先堆放在基坑北侧坑顶,然后再装入自卸汽车运出。由于工期紧张,施工单位把每层开挖深度增大为3.0m,以加快基坑挖土及加固施工的进度。在开挖第二层土时,基坑变形量显著增大,变形发展速率越来越快。随着开挖深度的增加,坑顶地表出现许多平行基坑裂缝。但施工单位对此没有在意,继续按原方案开挖。当基坑施工至5m深时,基坑出现了明显的坍塌征兆。项目经理决定对基坑进行加固处理,组织人员在坑内抢险,但已经为时过晚,基坑坍塌造成了多人死亡的重大事故,并造成了巨大的经济损失。

本工程基坑应重点监测内容()等。

A.基坑侧壁水平位移

B.周边建筑物、管线沉降

C.基坑底部隆起位移

D.出土量大小

E.人员进出情况

答案

参考答案:A, B, C

选择题
阅读理解

Matt Haimovitz is 42 and a renowned cellist (大提琴手) in the world. He rushed into the classical music scene at the age of 12 after Itzhak Perlman, the famed violinist, heard him play.

But nothing in his family history explains where Haimovitz got his extraordinary talent. And that’s typical, Ellen Winner, a professor says.

“People are fascinated by these children because they don’t understand where their talent came from. You will see parents who say, ‘I wasn’t like this, and my husband wasn’t like this.’ It seems to sometimes just come out of the blue,” Winner says.

It’s not clear whether a prodigy’s (天才)brain is any different from the brains of other children, in part because there have been no study comparing the brains of prodigies to those of average people.

“But I believe that anything that shows up so early, without training, has got to be either a genetic or some other biological basis,” Winner says. “If a child suddenly at the age of 3 goes to the piano and picks out a tune and does it beautifully, that has to be because that child has a different brain.”

Children who are extremely gifted tend to be socially different, too, Winner says. “They feel like they can’t find other kids like themselves, so they feel strange, maybe even like a freak, and feel like they don’t have anybody to connect with. On the other hand, they also long to connect with other kids, and they can’t find other kids like themselves.”

As Haimovitz got older, he became frustrated. He wanted to play other kinds of music but felt constricted by the image and the expectations of the boy prodigy who played classical music and filled concert halls.

“When you start that early, you suddenly start to grow up in public, and I wanted to experiment,” Haimovitz says.

So he took his cello into punk rock clubs and coffee houses. He played Bach, Haydn and Hendrix. “My teacher was Leonard Rose, and we never played any 20th-century music. He didn’t like it. But once I was exposed to James Marshall “Jimi” Hendrix, Miles Dewey Davis El and others, I couldn’t really turn back. I wanted to know more,” he says.

小题1:According to some parents, prodigies’ extraordinary talent       .

A.comes unexpectedly

B.is inherited from parents

C.results from hard work

D.is trained in early times小题2:Winner seems to agree to the fact that ____.

A.average people have their particular brains

B.biology is the base of a different brain

C.a prodigy’s brain is superior to those of others

D.genes play an important role in a prodigy小题3:According to the text, gifted children are         .

A.lonely

B.easy-going

C.innocent

D.social小题4:The last paragraph is mainly about how Haimovitz was trying to         .

A.build up his friendship

B.play different kinds of music

C.set up the image of a prodigy

D.perform classical music creatively