交河故城土体裂隙灌浆材料性能试验  

PERFORMANCE TEST OF COMPATIBLE SLURRY GROUTING INTO SOIL FRACTURE AT ANCIENT CITY OF JIAOHE

作　　者：杨涛[1] 李最雄[1,2,3] 汪万福[2,3] 

机构地区：[1]兰州大学土木工程与力学学院,甘肃兰州730000 [2]敦煌研究院保护研究所,甘肃敦煌736200 [3]敦煌研究院文物保护技术服务中心,甘肃敦煌736200

出　　处：《岩石力学与工程学报》2009年第A02期3782-3788,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家科技支撑计划重点项目(2006BAK30B02)

摘　　要：以PS为主剂,粉煤灰和交河故城原生土为填充材料,氟硅酸钠为固化剂制得PS-(F+C)浆液,测定浆液的初凝速度,并观测结石体的收缩变形性。测试结石体在不同龄期时的强度,对比固化温度、固化剂掺量、PS模数、PS浓度以及水灰比等因素对结石体强度的影响。对PS-(F+C)浆液结石体进行水稳定性、抗冻融性、安定性和耐碱性等耐候性试验。试验结果表明,PS-(F+C)浆液和易性与可灌性非常好,它与交河故城生土遗址相兼容,浆液的凝结速度适中且可调,水灰比为0.60时的线性收缩率约2.6%,PS主剂浓度是决定浆材长期强度的最关键参数,吐鲁番夏天较高的固化温度有利于气硬性PS-(F+C)浆液结石体强度的增长,而且浆液结石体的耐候性能良好。PS-(F+C)浆液将用于封护加固交河故城生土遗址中的裂隙,防止雨水沿裂隙冲蚀下切崖体。The PS-（F＋C） slurry is prepared by mixing PS（Potassium Silicate in optimum modulus） as binding ingredient,fly ash（F） generated from thermal power plant and pulverized native raw soil（C） at the ancient city of Jiaohe as filling substance,and sodium fluosilicate as treatment agent,its initial setting time is obtained and the shrinkage behavior of its concretion is monitored.The uniaxial compressive strength of PS-（F＋C） grouting material is tested at different ages and the influencing factors for its strength.Treatment temperature,amount of sodium fluosilicate,modulus of PS,concentration of PS and water-ash ratio are also discussed.Furthermore,the durability experiment including its resistance to water,to cyclic freezing-thawing,to saline crystallization in porous PS-（F＋C） grouts and to aqueous alkali is carried out.It is shown that the slurry of PS-（F＋C） with good workability is more compatible with the soil mass at the ancient city of Jiaohe because of adding native raw soil in a half weight of fly ash,and it shrinks less for the spherical bulking material of fly ash.Its treatment process is moderate and controllable,the linear shrinkage of its concretion with a PS to filling material ratio by weight of 0.60 is about 2.6%,the long-term strength is overwhelmingly determined by PS concentration,and its durability is pretty good.High ambient temperature is a positive impact factor that enhances the strength of air hardening PS-（F＋C） grouts in its treatment process,so that it is a proper decision to execute the grouting practice in hot summer.Such slurry will be used in grouting reinforcement of fractured soil mass at the ancient city of Jiaohe to prevent further erosion by running water through fractures.

关 键 词：灌浆材料 裂隙灌浆 PS-(F+C)浆材 PS主剂 粉煤灰 生土 固化剂 

分 类 号：TU472.5[建筑科学—结构工程] TV543[建筑科学—土工工程]