微型土钉微型化学注浆技术加固土质古窑  

HISTORICAL EARTHEN KILN REINFORCEMENT WITH MICRO-SOIL NAILING AND MINI-CHEMICAL GROUTING TECHNIQUES

作　　者：柴新军[1] 钱七虎[2] 罗嗣海[3] 林重德[4] 

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]中国人民解放军理工大学,江苏南京210007 [3]江西理工大学,江西赣州341000 [4]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》2008年第2期347-353,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：东华理工大学博士基金资助项目(DHB0602)

摘　　要：土遗址的保护是一个世界性的难题,其本身的病害主要表现为遗址表层土的分化剥落、土体开裂和坑壁坍塌等。传统的土钉锚固技术和化学注浆技术应用于土遗址表层的加固保存时存在一些缺陷:(1)钻孔直径较大,对遗址易造成较大的扰动,且在遗址表面易留下较明显的痕迹;(2)传统的化学注浆技术注入压力大,易导致土遗址内部产生微裂纹破坏,常出现化学加固剂沿孔壁和注入管之间的间隙外溢至地表,污损遗迹外观。直接喷淋化学加固剂于遗址表层,渗透量和加固效果则难以评价。以加固堂加2#土质古窑址为目标,开发出微型土钉技术和微型化学注浆装置,以克服上述不足。根据具体的工况特征,二者可结合使用,也可单独应用。开发的微型装置主要包括水泥浆注入器、气球密封注入前端等,其显著特征是适合于微型钻孔(φ5～7 mm)中进行注浆锚固和化学加固,具有一定的创新性。该微型加固技术的有效性和适宜性在现场模拟土窑的加固试验中得到检验。应用有限差分程序FLAC对2#土质古窑进行稳定分析,根据不同部位的稳定性和可能的破坏模式,进行微型加固方案的设计,并成功地应用于2#土质古窑的加固保存。该微型加固技术以其便携、微扰动和现场适应性强等特点在土遗址的加固补强中具有良好的应用前景。Preservation of historical earthen ruins against damage is one of the difficult problems.The main geological issues of such earthen ruins are weathering,cracking and falling of the surface soil.Conventionally used soil nailing and chemical grouting techniques have the following limitations when applied to strengthen these ruins.One is that the large diameter of drill hole will disturb the soil ruins and leave evident spots of appearance.The second one is that chemical grouts flow towards ground surface and will also spoil the appearance of the soil ruins.And also the high injection pressure may lead to micro-cracks inside the earthen ruins.Further spraying chemical grouts on the surface is frequently used in practice,but the permeation quantity and solidification effect are difficult to evaluate.From the objectives of strengthening and preserving Dougaeri historical earthen kiln No.2,the micro-soil nailing and mini-chemical grouting techniques have been developed to overcome the above limitations.The two techniques can be used together or individually according to the specific requirements.The important micro-equipments developed are mortar injector and balloon cover injection tip,which are suitable for nailing and chemical grouting in micro drill holes（φ 5–7 mm）.The feasibility and adaptability of the techniques have been evaluated in a field model kiln test.A fast Lagrangian analysis of continua（FLAC） code has been employed to perform stability analysis.The reinforcement design with the micro-techniques has been presented considering the different stabilities and possible failure modes at different locations of the kiln.The recommended design has been successfully applied to the practical works.It is envisaged that the micro techniques will have broad applications to strengthening and preserving historical earthen ruins due to its portability,little disturbance and well-field adaptability.

关 键 词：土力学 土遗址 微型土钉 微型化学注浆 数值分析 补强设计 

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