Ӧ�� ABAQUS ����Ԫ������Խ���׮֧��������ȶ��Ե���ع�ϵ���з��������֤�����ӽ���׮��ȿ�����Ч����λ�ƣ����ӽ���׮���ȶ�ϵ��; ���Ž���׮������ӣ������潫�仺������Ҫλ�ƴӽ���׮�Ķ����������µ��������ڽ���׮���ж������ڴ˻�����ģ�⸴������ˮ��������׮��� (D) �������� (H) �Ĺ�ϵ�����ó�����Ѻ�ȹ�ϵʽΪ: D =1. 35H ��5. 575��

ABAQUS finite element software has been used to analyze the relationship between the supporting thickness and stability of cement- soil mixing pile�� The results show that the thickness of mixing pile controls the displacement and increases the stability effectively�� The sliding surface becomes slower along with the thickness in- creasing of mixing pile��and the main displacement decreases and concentrates from the top to the middle part of mixing pile�� Then��by simulating the relationship between the thickness of compound soil nailing cement- soil mix- ing pile and the deepness of foundation pit��the authors obtain the optimum formula is D =1. 35H ��5. 575��