天水花南村滑坡特征与成因研究

天水花南村滑坡发生于2014年3月，经过数次现场调查，发现该滑坡属于黄土-泥岩接触面滑坡，本次滑动系由冻结滞水引起孔隙水压力升高，融冰后孔隙水压力无法及时消散造成。基于现场测量得到该滑坡面积1.24104m2，体积约1.24105m3，滑坡发生后摧毁了310国道K1428+10～K1428+210所有挡土墙，并且大量滑坡堆积物堆积于路面上，长约200m的路面一侧车道堆满滑坡堆积物，造成该段路面经常性堵车。通过2014年3月、2014年8月以及2015年1月3个阶段持续调查，发现该滑坡一直具有复活滑动痕迹-剪出口滑坡堆积物不断增多。同时，详细调查了花南村滑坡的地质环境和滑坡特征，结合滑坡发生过程，研究了花南村滑坡发生的地质成因，认为冻结滞水解冻后引起孔隙水压力升高无法及时消散对该滑坡的发生具有控制作用；持续强降雨和修路人工开挖形成的临空面是该滑坡发生的重要诱发因素。

STUDY ON THE CHARACTERISTICS AND ORIGIN OF HUANANCUN LANDSLIDE

On March, 2014, Hua-nancun Landslide occurred in Tianshui, Gansu Province, China. It is a loess-mudstone interface landslide which is caused by high pore water pressure of thawing of frozen perched ground water. The area of Hua-nancun landslide is 1.24104m2 and the volume is 1.24105m3. The retaining wall of the 310 national highway in K1428+10~K1428+210 was destroyed by Hua-nancun Landslide, and the road was always in a traffic jam because of 200m road was covered with the amount of accumulation on the 310 national highway since the landslide occurred. We investigated the Hua-nancun landslide in March, 2014; August, 2014; January, 2015, the landslide was in the activity all the time. Also detailed investigation about geological environment and characteristics of Hua-nancun landslide was done in the past time. The conclusion is obtained by studying the geological facters that frozen perched ground water is the main facter of producing Hua-nancun landslide. Continually heavy rain and artificial excavating are the inducing facters of Hua-nancun landslide on the same way.