Abstract: The Great Wall was announced as the first batch of key cultural relic unit under State Protections by State Department in 1961, and was listed as the world cultural heritage by UNESCO in 1987. And these constructions are humankind’s precious cultural heritage, and their valuable artistic value is rare worldwide. Through the compression test, the shear strength test and the infiltrate test, the results of test indicate that the compression strength and the shear strength increases with the PS material consistency and the reinforcement times, and that he PS meterials can be multiple application. At the same time, the results show that the 7 % PS materials is the best consistency to consolidating the soil of the Great Wall. In addition, the permeability coefficient of the reinforced sample decreases and the permeability meets the requirements of preservation of cultural relics. By a comprehensive analysis, the 3 %—5 % of PS is suitable for consolidating the wall whose dry density is 1.5—1.7 g•cm-3, but 5 %—7 % of PS is fit for consolidating the wall whose dry density is 1.3—1.50g•cm-3. In sum, the key to protecing ruins is choosing the suitable PS consistency material and consolidation times in order to enhancing penetrability of PS material. So this reinforced method could be effective in protecting the Great Wall of Qin Dinasty in the Warring States in Northwest China.

Key words: ancient sites, Great Wall, the ramming wall, consolidation, PS material