甘肃黑方台黄土滑坡滑距影响因素的试验研究

Experimental Evaluation of Factors Affecting Slip Distance of Landslide in Loess Soils at Heifangtai, Gansu Province

黑方台位于长期灌溉地区,黄土滑坡广泛发育,直接威胁到了台塬下方村落的安全,深入研究这类滑坡的危害特征,进行合理有效的滑坡预测对保障当地居民的生命财产安全有着重要意义。基于室内模拟试验,选用黑方台原样黄土,在测得其初始质量含水率的前提下,通过控制固定的滑坡体体积,在不同坡度下进行了多组不同质量含水率的模拟试验,测量并记录试验得到的黄土滑坡的滑距、宽度、堆积厚度、面积等数据,通过综合分析所得数据,建立坡度及质量含水率与黄土滑坡各项基本特征参数的关系。

Heifangtai is in Yongjing County,Gansu Province.It is in an area with a long history of irrigation.Loess landslides are widely developed and often occur,which directly poses a geohazard to the safety of villages at the toe of terrace lands.The shear strength of the loess soil slopes with various slope angles and with different moisture contents from Heifangtai were laboratory evaluated.The simulations were studied with soil samples prepared in a constant slope volume and initial moisture content of original soils tested.The experimental landslide body parameters,such as,distance of slide,width of sliding body,thickness and area of the sliding body,were measured under different conditions.The relationships among the degree of slope angles,moisture contents and the landslide occurrence were established.