【摘要】 <正>回 顾 国内外研究表明(S.Taber,1930;G.Beskow,1935;H.A.1955;1957;作者,1965等),在水流可以排除的条件下,饱水砂砾石等粗粒土冻结后的含水量比冻前反而减少。许多学者(A.E.Wissa andR.T.Martin,1968;N.R.Morgens-tern and C.B.Smith,1973;W.D.更多还原

【Abstract】 When the freezing front advances through a saturated gravel layer, the pore water pressure will be present, and the extra water induced by the expension as water changes into ice may be expelled under the action of water pressure. Experimental evidence shows that there are good relationships among the frost heave rate d ( Ah )/dt, pore water pressure pw or its rate dpw/dt and frost penetrated speed Vf(see Fig. 2,3,4 and equ.2,3) .Besides, we have given the conditional equation (see equ. 4 ) preventing construction from frost heave by the method of expelling water in the "saturated gravel bedding according to the total weight of building N, the section area of bedding F, the maximum water pressure(pw)max bearable to the building and the total tangential frost heaveforce Σtifi induced by frost edge effect on tht lateral surface of 1foundation while pw=(pw)max.更多还原