Ϊ�о�������ѩ��ɽ���µij�������ڻ��º�Ե�����ѷ촦������ 4 ֧�ѷ�Ʋ���չ��������⣬��ȡ�����ѷ� 1 ��4 �·ݵĻ����������⼰�о�����: ����˳�㼰���Ҽв���ѩ��ɽ���µ��������򣬽�ˮ���������Ǹô����µ����������շ�����; �ս�ˮ�� 20 mm��ǰ 2 d �ۻ���ˮ�� 30 ��40 mm��ǰ 3 d �ۻ���ˮ�� 40 ��50 mm������Ϊѩ��ɽ���µ����ֺ�Ԥ��Ԥ�����ٽ�Ԥ��ָ�ꡣ

In order to study the formation mechanism of Xuelang Mountain landslide��four sensors were suc- cessfully set up�� On the basis of continuous monitoring from January to April��the activity characteristics of rock fis- sures on trailing edge of landslide were obtained�� Monitoring and research shows that consequent slope and mud- stone interlayer are the two major internal factors��while precipitation and low temperature are the two major in- duced factors�� The daily precipitation of 20 mm��the accumulation precipitation 30 ��40 mm in the first two days or 40 ��50 mm in the first three days can be used as the critical early warning index for geological disaster warning and forecasting��