点滴化学注浆技术加固土遗址工程实例  

CASE STUDY OF DRIP INJECTION OF CHEMICAL GROUTS IN EARTHEN RUINS REINFORCEMENT

作　　者：柴新军[1] 钱七虎[2] 杨泽平[1] 林重德[3] 松永和也[3] 

机构地区：[1]东华理工大学土木与环境工程学院,江西抚州344000 [2]解放军理工大学,江苏南京210007 [3]佐贺大学低平地研究中心,日本佐贺840-8502

出　　处：《岩石力学与工程学报》2009年第A01期2980-2985,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：江西省教育厅2009年度科技项目(GJJ09258);教育部留学回国人员科研启动基金资助项目(教外司留[2008]890号);东华理工大学博士基金资助项目(DHB0602)

摘　　要：表面防风化问题一直是土遗址保护研究的重点和难点。将开发研制的点滴化学注浆装置应用于工程实际,对堂加2#土遗址表层进行化学加固,内容包括:室内模拟场地点滴注浆试验、浆液固化体三轴试验、微观结构扫描电镜(SEM)观察、现场模拟土遗址的点滴注浆试验、点滴化学注浆技术加固堂加2#土质古窑。试验结果表明:(1)点滴化学注浆装置采用的气球密封注入前端构造,可有效解决注入过程中浆液外溢问题,并可在地下遗址顶部及其附近实现由下而上的化学注浆加固;(2)化学加固剂(硅酸乙酯)通过改善土粒团块之间的胶结状态,可有效提高遗址土的黏聚力,对内摩擦角的影响不甚明显;(3)点滴化学注浆技术可对预定厚度的遗址土进行有效加固,克服了喷涂工艺加固深度浅且易出现两张皮的现象;(4)点滴化学注浆技术对堂加2#土质古窑的成功加固,验证了该技术的现场适宜性和可行性,对类似的土遗址固化处理具有借鉴和参考意义。Weathering prevention is one of the difficulties in earthen ruins conservation. The self-developed drip injection apparatus of chemical grouts is first applied to engineering practice to perform chemical reinforcement on the surface of Dougaeri earthen ruins No.2. The main contents include drip injection of chemical grouts in laboratory model ground, the strength characteristics of chemical grouted soil by triaxial tests, microstructures investigated by SEM observation, drip injection in field model earthen kiln, and reinforcement of Dougaeri earthen kiln No.2 by drip injection of chemical grouts. The test results show that： （1） the balloon cover injection tip specially developed for the drip injection tube can prohibits chemical grout flowing upward to the ground surface, in particular it can implement down-to-up chemical grouting on the top of underground earthen ruins due to its soft and tight attachment with the drill hole sides： （2） chemical grouts（ethyl silicate） can increase cohesion effectively, but it has little influence on the internal friction angle; （3） the thickness of chemical grouted soil by the drip injection apparatus is much larger than that of spraying chemical grouts on the surface of earthen sites; and （4） the field feasibility and adaptability of the drip injection apparatus has been verified by its successful application on strengthening Dougaeri earthen kiln No.2, which will benefit to preservation of other similar earthen ruins.

关 键 词：土力学 点滴注浆 化学加固 土遗址 防风化 

分 类 号：TU44[建筑科学—岩土工程] TV543[建筑科学—土工工程]