问题
问答题 简答题
管涌发生的条件是什么?防治措施有哪些?
答案
参考答案:
发生条件:
(1)必要条件:土中粗颗粒所构成的孔隙直径必须大于细颗粒的直径。通常发生在Cu>10的土中。
(2)水力条件:动水力能带动细颗粒在孔隙间滚动或移动。
防治原则:
(1)改变几何条件,在渗流逸出部位铺设反滤层。
(2)改变水力条件,降低水力梯度,如打板桩。
管涌发生的条件是什么?防治措施有哪些?
参考答案:
发生条件:
(1)必要条件:土中粗颗粒所构成的孔隙直径必须大于细颗粒的直径。通常发生在Cu>10的土中。
(2)水力条件:动水力能带动细颗粒在孔隙间滚动或移动。
防治原则:
(1)改变几何条件,在渗流逸出部位铺设反滤层。
(2)改变水力条件,降低水力梯度,如打板桩。
Li Ming 26 often late for school. The teacher is very angry with him. “ 27 are you often late for school?” asks the teacher. “Because I often get up 28 ,” answers Li Ming. “ 29 clock can wake (唤醒)you up,” says the teacher.“Yes, you are 30 .But it 31 work ,” says Li Ming.“Why don’t you 32 it?” asks the teacher again.“Oh, I don’t want it to work 33 ,” answers Li Ming.“If all of us are late for school, 34 do you like it?” says the teacher.“Oh, that’s great! There will be 35 schools in the world,” says Li Ming with a smile.
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