问题 单项选择题

在某裂隙岩体中,存在一直线滑动面,其倾角为30°。已知岩体重力为1500 kN/m,当后缘垂直裂隙充水高度为8 m时,试根据《铁路工程不良地质勘察规程》(TB 10027—2001)计算下滑力,其值最接()

A.(A) 1027 kN/m

B.(B) 1238 kN/m

C.(C) 1330 kN/m

D.(D) 1430 kN/m

答案

参考答案:A

解析:

据《铁路不良地质勘察规程》附录A计算:

下滑力为T=Wsinβ+Vcosβ=1500×sin 30°+320×cos30°=1027(kN/m) 答案(A)正确。

判断题
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七选五

                                                            Crossroads International

     1. How does Crossroads work?

     Crossroads is a resource network.We take goods Hong Kong doesn't want and give them to people

who badly need them.We collect those goods and give them out in the welfare arena (福利院) in Hong

Kong, Mainland China, elsewhere in Asia, Eastern Europe and Africa. __  1____

     2. Who do we help?

     __   2    __  They are grassroot groups who have seen a need and tried to meet it.They can't get the

job done without backup, though, so our task is to help them do their task.Our warehouse is full of goods, from computers to high chairs, clothing to books, stationery to medical provision, cupboards to dining sets.They send us a list of their needs and we try to match it with the resource we have in stock.

     3.  __   3   __  

     Crossroads itself also operates on a low budget.We do not buy the goods we send.They are donated. __   4   __   Nobody in our organization receives a salary.Even our fulltime staff work on a voluntary

basis.

      Those that donate goods and services:

     ●Factories                       ●Manufacturers

     ●Hospitals                       ●Hotels

     ●Educational Institutions  ●Householders

     ●Transport Companies    ●Offices

     ●Other Charities

     __    5    __  While we receive large quantities of goods and there is never a short supply of requests

for them, we are always in need of hands to help sort and prepare them for shipping.

     A.One resource that we are always in need of is people.

     B.So Crossroads is just that: a Crossroads between need and resource.

     C.What can I do?

     D.The welfare agencies we help do not run on large budgets.

     E.How do we operate?

     F.All volunteer work is done at our warehouse.

     G.Similarly, rather than raising funds for freight (货运), we ask transport companies to donate their

services.