Abstract: The cement-soil mixing anchor, which can provide a great bearing capacity, is introduced. The effect of the cement-soil mixing anchor is superior to that of the soil nail in the same condition. However, the performance of controlling deformation of the anchor is inferior to that of the supporting brace. Therefore, the fracture morphology and the existing problem in this anchor is analyzed and presented based on the previous experiment and engineering application. Furthermore, the improved experimental schemes of increasing blades and the second grouting are presented to improve uplift resistance of the cement-soil mixing anchor. The setting of the blades is designed and the test is executed firstly; and then the distribution of axial forces along the anchor is tested. The results show that the effect of an anchor with a length of 12 m can play a role of an general cement-soil mixing anchor with a length of 15 m when the blades are added. The blades can help to improve the uplift resistance and decrease the displacement. In addition, the performance of the second grouting is not remarkable when the grouting pressure is low.

Key words: cement-soil mixing anchor, uplift resistance, Agitation blade, Second grouting