【作者】 吕萌； 巨玉文；

【Author】 Lü Meng;Ju Yuwen;Department of Architecture and Civil Engineering,Taiyuan University of Technology;

【机构】 太原理工大学建筑与土木工程学院；

【摘要】 以山西省临汾市吉县为例,通过对其黄土地质灾害点的实地调查和所收集资料的分析得出,降雨和冻融为黄土崩塌的主要诱发因素。而降雨和冻融诱发的崩塌主要是由于土体含水量的变化,基于此对灾害点原状土样在不同含水量下进行抗剪强度实验,分别对土体黏聚力和内摩擦角这两抗剪强度指标进行分析。结果表明抗剪强度随土体含水量增加呈现先增大后减小趋势,在界限含水量时达到最大,此界限含水量ωCJ为(17±2.00)%。而崩塌灾害发生时,往往土体含水量远高于界限含水量,抗剪强度随含水量的增大急剧下降,成为灾害发生的内因。更多还原

【Abstract】 Take Jixian County,Linfen City of Shanxi for example,It can be concluded that rainfall and freezing thawing are predisposing factors through the investigation of Loess geological disasters and the analysis of the collected data. The loess collapse induced by rainfall and freezing thawing is largely due to the change of soil water conteng,taking the shear strength experiment by undisturbed soil samples under different moisture on the places where disasters happened and analyzing the two indexes of shear strength about soil cohesive force and angle of internal friction. what the results show is that shear strength showed a trend of first increases and then decreases with the increase of soil water content and strength reached maximum with the limited moisture content,which ωCJis( 17 ±2. 00) %. when the collapse disasters occur,the soil water content is much higher than the atterberg limits,alone with the increase of water content the shear strength declined sharply,which is the internal cause of disasters.更多还原