问题 问答题 简答题

简述路基压实机理及意义?影响压实的因素有哪些?

答案

参考答案:

用某种工具或机械对土基进行压实时.在压实机具的短时荷载或振动荷载作用下,土颗粒重新排列和互相靠拢,小颗粒进入大颗粒的孔隙中,孔隙率减小;单位体积内固体颗粒含量增加,增加了祖土颗粒间的摩擦和咬合及细土颗粒间的粘结力,从而提高了土基的强度和稳定性。充分压实的土基,可以发挥土基的承载强度,减少土基和路面在车轮荷载作用下产生的形变,增强土基的水稳性和强度稳定性,有效地延长路面的使用寿命。土基的压实过程受到多种因素的影响,在室内对细粒土进行击实试验时,影响土的密实度的主要因素有:含水量、土的颗粒组成及击实功能。在施工现场碾压细粒土的土基时,影响土基压实度的主要因素有:土的含水量、上的类型、压实层的厚度、压实机械的类型和功能及碾压迫数等

阅读理解

A yoga master made a shocking statement that Abraham Lincoln had been a Himalayan yogi in a past life.Lincoln delivered a proclamation setting up Thanksgiving as an American holiday in 1863.Research throws light on a possible Hindu (印度的)origin for the American celebration of Thanksgiving.

"The holiday of Thanksgiving has a Hindu origin," says Richard Salva, author of a book on the reincarnation (转世)of Abraham Lincoln entitled Soul Journey: From Lincoln to Lindbergh which is based on a statement by the great master of yoga, Paramhamsa Yogananda, who declared that Abraham Lincoln had been a Himalayan yogi in a past life, and that he was reborn as the famous pilot, Charles Lindbergh.

“During my search for signs of a past-life yoga practice,” SaIva said, “I noticed that President Lincoln repeatedly chose Thursdays as national days of prayer, fasting (禁食),and thanksgiving.This was interesting, because Thursday is considered a holy day — a day for prayer, fasting, and spiritual reflection — among Hindus, who call it “guru day”.”

“Lincoln also set aside time on Thursdays to grieve(哀悼) for his son,Willie, who died in Washington.Clearly, Thursdays had a spiritual significance in Lincoln's mind.

In his book, Richard Salva presents more than 500 connections between Lincoln, Lindergh, and the ancient spiritual science of yoga. The connections run through every aspect of the human condition and provide convincing evidence that Lincoln had had a Hindu past life.

More than one out of every five Americans today believes in reincarnation—yet few are aware of how past-life patterns affect them. Soul Journey tries to fill this gap, by offering a substitute experience of reincarnation. Through clear and persuasive similarities between the lives of Lincoln and Lindbergh, the book discovers how the hidden laws of fate and reincarnation impact the events of his or her daily life. It addresses other issues, such as the secret spiritual history of America's greatest president, including his past life as a Himalayan yogi; the hidden clues that reveal past lives; the greatness he achieved; and the spiritual principles behind the yoga postures that millions now practice.

小题1:Based on Richard Salva’s view, ______.

A.Hindus started the holiday of Thanksgiving

B.the Americans copied Thanksgiving from Hindus

C.Charles Lindbergh had been a Himalayan yogi

D.Thanksgiving had Hindus roots小题2:We can draw a conclusion from the passage that ______.

A.in India all the prayers are done on Thursday

B.in India Thursday is a religious day

C.Abraham Lincoln was once a famous pilot

D.Paramhamsa Yogananda once taught Lincoln yoga小题3:When it came to the comparison between Lincoln and Lindbergh, the author held a ______ attitude.

A.neutral

B.doubtful

C.negative

D.positive

单项选择题