吉林大学学报（地球科学版）
吉林大學學報（地毬科學版）
길림대학학보（지구과학판）
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
2期
596-602
,共7页
平推式滑坡%启动判据的修正%承压水作用范围%物理模型试验%孔隙水压力
平推式滑坡%啟動判據的脩正%承壓水作用範圍%物理模型試驗%孔隙水壓力
평추식활파%계동판거적수정%승압수작용범위%물리모형시험%공극수압력
translational gliding landslide%modification of the start-up criterion%action range of confined water%physical simulation%pore water pressure
对平推式滑坡启动判据的传统研究往往忽略滑块后缘的静水压力沿滑面法向的分力及承压水作用的具体范围，因而导致计算结果不准确。通过对平推式滑坡进行全面的受力分析，同时引入了承压水作用范围的概念，最终推导出修正后的平推式滑坡启动判据公式。将所得的修正判据应用于模型试验的结果分析，发现修正方法计算结果比传统方法大6．0％～15．5％，更加接近于试验观测值，验证了修正判据的准确性。同时对平推式滑坡启动临界水头的模型试验结果和修正计算值之间的差异进行了机理分析：当边坡模型滑动面倾角小于等于8°时，渗流的时滞性和渗透层的不均匀性导致启动临界水头实测值大于修正计算结果；当倾角大于8°时，模型稳定性随试验时间增加而逐步降低，导致启动临界水头实测值小于修正计算结果。
對平推式滑坡啟動判據的傳統研究往往忽略滑塊後緣的靜水壓力沿滑麵法嚮的分力及承壓水作用的具體範圍，因而導緻計算結果不準確。通過對平推式滑坡進行全麵的受力分析，同時引入瞭承壓水作用範圍的概唸，最終推導齣脩正後的平推式滑坡啟動判據公式。將所得的脩正判據應用于模型試驗的結果分析，髮現脩正方法計算結果比傳統方法大6．0％～15．5％，更加接近于試驗觀測值，驗證瞭脩正判據的準確性。同時對平推式滑坡啟動臨界水頭的模型試驗結果和脩正計算值之間的差異進行瞭機理分析：噹邊坡模型滑動麵傾角小于等于8°時，滲流的時滯性和滲透層的不均勻性導緻啟動臨界水頭實測值大于脩正計算結果；噹傾角大于8°時，模型穩定性隨試驗時間增加而逐步降低，導緻啟動臨界水頭實測值小于脩正計算結果。
대평추식활파계동판거적전통연구왕왕홀략활괴후연적정수압력연활면법향적분력급승압수작용적구체범위，인이도치계산결과불준학。통과대평추식활파진행전면적수력분석，동시인입료승압수작용범위적개념，최종추도출수정후적평추식활파계동판거공식。장소득적수정판거응용우모형시험적결과분석，발현수정방법계산결과비전통방법대6．0％～15．5％，경가접근우시험관측치，험증료수정판거적준학성。동시대평추식활파계동림계수두적모형시험결과화수정계산치지간적차이진행료궤리분석：당변파모형활동면경각소우등우8°시，삼류적시체성화삼투층적불균균성도치계동림계수두실측치대우수정계산결과；당경각대우8°시，모형은정성수시험시간증가이축보강저，도치계동림계수두실측치소우수정계산결과。
Two aspects are always neglected in the existing research about start-up criterion of translational gliding landslide:one is the normal component force of hydrostatic pressure at posterior border of slope,which acts on slip surface,the other is the action range of confined water.Therefore the calculation results of start-up criterion of translational gliding landslide are inaccurate.Overall force analysis are exerted on translational gliding landslide,meanwhile the conception of action range of confined water is introduced,then the modified start-up criterion is deduced.The modified start-up criterion is applied to analyze the results of physical simulation.It shows that the result of the modified criterion is about 6.0% to 15.5% larger than the traditional criterion and much close to the observed value.The modified criterion is proved to be accurate.Mechanism analysis is applied in the differences of critical hydraulic between the test results and the calculation results obtained from the modified start-up criterion of translational gliding landslide.When the sliding surface inclination of the model slope is less than or equal to 8 degree,the test results are greater than the calculation results obtained from the modified start-up criterion because of the hysteresis of seepage and the inhomogeneity of permeability layer.When the sliding surface inclination is greater than 8 degree,the test results are less than the calculation results due to decrease of the model stability with increase in test time.
