现场PS喷洒渗透加固深度与喷洒工艺的对比研究

为研究PS喷洒工艺与渗透深度的关系，进而为加固施工提供技术参数，为此在甘肃省敦煌市河州堡开展了现场试验。在划定试验区域，开展了3％、5％与7％浓度在不同次数喷洒的渗透深度试验，同时对PS用量进行了统计。试验结果表明：（1）内墙上，7％浓度PS三次喷洒的渗透深度满足防风化加固的要求且PS用量适中；（2）外墙上，5％浓度PS喷洒三次渗透深度满足防风化加固的要求且PS用量适中。通过试验可知，PS喷洒多次渗透效果更为理想，低浓度PS渗透密度大的土体与高浓度PS渗透密度小的土体效果较好。试验结论为正在施工中的交河故城遗址体防风化加固提供了施工依据。

Comparison of on-site spraying techniques and depth of penetration of PS solutions

In order to assess the relation between spraying techniques and depth of penetration by PS solutions therefore providing a basis for comparing the efficacy of the processes,the Hezhoubu site of Dunhuang country in Gansu province was chosen as a test site.At the selected region,objects at this site were sprayed at different times with 3%,5% and 7% PS solutions,and the depth of penetration was measured.The test data indicts:(1)spra- ying three times with 7% PS can satisfy anti-weathering requirements by delivering a moderate PS dosage to the inner wall;(2)spraying three times with 5% PS can satisfy anti-weathering requirements by delivering a PS dos- age to the outer wall.These results show that spraying several times can will achieve a satisfactory consolidation, and that it is best to use a high-concentration PS solution for permeable low-density soils and low-concentration PS solution with permeable high-density soils.These results provide a basis for considering their use for anti- weathering consolidation of earthen architecture in the Jiaohe ruins