全风化花岗岩地层单-双液浆加固试验研究

来源期刊:中南大学学报(自然科学版)2018年第12期

论文作者:李召峰 张健 李术才 杨磊 张庆松 王凯 齐延海 林荣峰

文章页码:3051 - 3060

关键词:全风化花岗岩;水泥浆液;水泥-水玻璃浆液;加固模式;抗压强度;抗崩解性

Key words:fully-weathered granite; cement paste slurry; cement/sodium silicate slurry; reinforcement pattern; compressive strength; anti-disintegration

摘    要:针对全风化花岗岩注浆治理工程中的浆液选型及注浆参数调控问题,通过注浆模拟试验,对水泥浆液和水泥-水玻璃浆液(C-S浆液)2种浆液的加固效果进行对比分析研究。研究结果表明,单-双液浆在地层中均以劈裂扩散为主,但扩散模式具有显著差异:水泥浆液呈直线式和放射式2种,其主控因素为水灰比;而C-S浆液的扩散模式主要为放射式和网络式,扩散模式受水灰比和注浆压力双因素影响。2种浆液注入地层后,加固体试样抗压强度、抗崩解性均显著增高,根据对加固效果的作用关系可将水灰比分为注浆压力作用区(水灰比为0.80~1.13)和C-S浆液优势区(水灰比为1.13~1.50),水泥浆液多适用于深部高压加固区,C-S浆液多适用于浅部低压加固区。在满足注浆工程要求前提下,C-S浆液加固体压缩可变形性和残余强度比水泥浆液加固体的高,加固地层更为稳定。通过工程现场验证,研究成果对类似地层的注浆加固治理具有一定的参考和借鉴意义。

Abstract: The selection of slurry types and the grouting parameter in the grouting engineering were discussed. The difference between two slurries in reinforcement pattern was analyzed based on grouting simulation experiment. The results show that diffusion patterns of the two slurries are different from each other due to the grouting characteristics. The cement paste has line model and emanant model, which is determined by the water/cement ratio, the cement/sodium silicate slurry has emanant model and network model, which is determined by the effect of water/cement ratio and grouting pressure. The compressive strength of the grouted weathered granite and anti-disintegration characteristics of both slurries are increased significantly. There are grouting pressure zone(water/cement ratio 0.80-1.13) and cement/sodium silicate slurry zone(water/cement ratio 1.13-1.50) of water/cement ratio according to the compressive strength and anti-disintegration characteristics. It is concluded that cement paste is suitable for high pressure reinforcement area and cement/sodium silicate slurry is suitable for low pressure reinforcement area. Under the condition that the requirements of grouting engineering are met, the deformability and residual strength of cement/sodium silicate slurry is higher than cement paste. The experimental results can provide some guidance for the grouting engineering in the similar stratum through test in-site.

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