ijˮ��վ���ڲ�ɽ���������Ϊ�����Խϲ����--����״���ң���������Ҫ����3 ���ϲ㡢1 ��������4 �����ƽ�������Ӱ���˸�ɽ����µ��ȶ��ԡ����ݽṹ��ֲ�����ȡ�����������������ϵĹؼ����壬ͨ����ƽͶӰ���ҳ����������еķǿ���϶׶������Щ�ǿ���϶׶���ٿ�����ϣ��Ӷ�������пɶ�����; ����ʸ�������㲻ͬ�˶���ʽ�¿���JP ��š����������ɻ�ùؼ����塣�������: ��ˮ��վ��ˮ�����ڲ�ɽ�������4 ��ؼ�����( JP ���Ϊ00010111��00110111��10110111�� 10111011) ��Ϊ�ñ����ȶ��ԵĽ�һ���о��ṩ�˻�����

The slope rocks of delivery tunnel inlet side of a hydropower station are middle-thin layered limestone�� in which there are mainly three faults��one dyke and four groups of superior joints�� The characters seriously effect the stability of this mountain slope�� According to the distribution of structural surfaces��the authors use block body theory to search of the key block bodies in the slope�� The non-spatial fracture cones in the slope were find out by stereographic projection law�� Combined them with free surface to get the whole movable block bodies��the authors calculated the JP number and the net sliding force under different movable forms to find out the key block bodies�� The result indicates that there are 4 key block bodies in the slope of delivery tunnel inlet side of this hydropower station��with the JP numbers 00010111��00110111��10110111 and 10111011��which proves the base for further examination of the slope stability��