非饱和土的性状和膨胀土边坡稳定问题_包承纲.pdf

26 1 Vol . 26 No. 1 2004 1 Chinese Jou nal of Geotechnical Enginee ing Jan. , 2004 Behavior of unsaturated soil and stability of expansive soil slope 包承纲 ( , 430010) : , P , P, P , P, , , , , : ; P; ; ; ; :TU 443 : A : 1000- 4548( 2004) 01- 0001- 15 : ( 1935- ) , , 1958 , , , BAO Cheng-gang ( Yangtze Rive Scientif ic Resea ch Inst itute, Wuhan 430010, China) Abstract : This pape focuses on the advance in fundamental behavio of unsatu ated soil and slope stability. Some impo tant p ope ties of unsatu- ated soil associated with slope stability a e discussed with emphasis on the fundamental p oblem of unsatu ated soils, i. e. , ai Pwate phases and thei movement ./ Fou- stage aiPwate phase0 division is put fo wa d fo an unsatu ated soil in which the mo istu e condition va ies f om d y to sat- u ated. Detailed expe imental studies demonst ated that an unsatu ated soil would exhibit diffe ent behavio at diffe ent states of ai Pwate phase. Then, fo unsatu ated soil the suction in an unsatu ated soil and its elationship to wate content ( i. e. , soil-wate cha acte istic cu ve( SWCC) ) a e discussed. A simple equation fo desc ibing the shea st ength of unsatu ated soils was p oposed on the basis of the fou- state division of ai P wate phase. The ecent advance in the constitutive elationships of an unsatu ated soil is also int oduced b iefly. Afte that, unde the enginee ing backg ound of the South- to- No th Wate T ansfe Canal, the majo inte nal and exte nal facto s affecting the slope stability in unsatu ated expansive soil a e discussed with the utmo st conce n to suction. Special discussions a e put on the ecent developments in the quantitative analysis fo the effect of