因龙门石窟早期使用的超细水泥和环氧树脂材料在后期存在着耐久性较差、泛盐碱等问题,迫切需要选出更有效的裂隙防渗灌浆新材料,以满足龙门石窟的防渗要求。通过对研发的偏高岭土、天然水硬性石灰、硫铝酸盐水泥等5组材料配方的流动性、收缩性、抗压抗折强度等特性进行对比分析,得出偏高岭土、天然水硬性石灰、膨润土3种材料配方适合于现场灌浆。在现场灌浆试验中,确定了灌浆压力为0.1~0.4 MPa,并对材料的可灌性和灌浆参数进行了探讨与分析。同时,为评价灌浆效果,对灌浆材料28 d后的固化程度、密实度、充填程度、黏结程度等进行检验分析,结果表明偏高岭土材料配方的灌浆效果最佳,为更适合于龙门石窟裂隙防渗的灌浆材料。
Abstract
Water-seepage is one of the most serious diseases endangering Longmen Grottoes, impervious grouting is a fundamental way to control seepage. As the early use of superfine cement and epoxy resin materials have poor durability, severe salinity problem, more effective seepage materials are demanded urgently. In this paper the liquidity, shrinkage rate, compressive and flexural strength and other characteristics of five new material formulations which include metakaolin, natural hydraulic lime, sulphoaluminate cement and so on obtained from indoor test are analyzed. Results reveal that the material formulations of metakaolin, natural hydraulic lime, and bentonite are suitable for field grouting. In the field grouting test, the grouting pressure is determined 0.10.4 MPa, and the groutability and grouting parameters are discussed and analyzed. Moreover, for the evaluation of the grouting effect, the curing degree, density, filling degree, bonding degree and other aspects of the grouting materials are examined and analyzed after 28 days. Results show that the grouting effect of the metakaolin is the best.
关键词
龙门石窟 /
防渗灌浆 /
抗压抗折强度 /
灌浆压力 /
可灌性
Key words
Longmen grottoes /
seepage grouting /
compressive and flexural strength /
grouting pressure /
groutability
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