土壤力學 - 土木

※ 引述《super14 (廢物)》之銘言：
: 1.想請教第三題中的孔隙比如何推求？
: https://i.imgur.com/ZdYZUqs.jpg
: 2.第二題中比重怎麼推都推不出2.58
: 想請教如何算？
: https://i.imgur.com/o3XOYea.jpg
: 想請教版上神人 因實在想不出來故發問請教

(3)

γm = [(Gs+S*e)/(1+e)]*γw

Gs*w = S*e

γm = [(Gs+Gs*w)/(1+e)]*γw

17.17 = [(2.6+2.6*0.086)/(1+e)]*1*9.81

e = 0.61

Dr = (emax-e)/(emax-emin) = (0.642-0.61)/(0.642-0.462) = 0.0178 = 17.8%

(2)

γm = [(Gs+S*e)/(1+e)]*γw

Gs*w = S*e

1.96 = [(Gs + e)/(1+e)] *1

Gs*0.25 = 1*e

1.96 = [(Gs + 0.25Gs)/(1+0.25Gs)]*1

Gs = 2.58


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