题目内容
地基内一点的应力状态σz=125kPa，σx=60kPa，剪应力τzx =τxz=25kPa，若(1)土为无粘性土，φ=30°；(2)土为粘性土，φ=20°，c=10kPa，问该点是否处于极限平衡状态？如果剪坏，那么剪切破坏面与最大主应力面的夹角是多少？
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