土压平衡盾构土体改良泡沫剂的试验研究

摘要

In light of the technical requirements of soil mass conditioning for EPB shield tunnel construction,re-search of a new foaming agent formula is conducted.A high-speed mixing method is adopted to choose the proper surface active agent,SDS is determined as the main foaming agent,and SDS is formulated again using AES.The test results indicate that good foam stabilizing effects are obtained if the foam stabilizer dodecanol with a concentration of 0.2 g·L-1and cationic guar gum with a concentration of 0.04 g·L-1of high molecular polymer are added when the SDS/AES proportion is 6:4 and the general concentration is 3 g·L-1.An economical and environment friendly labo-ratory formula for a foam agent with good foamability and stability is determined,a concentration adjustment is con-ducted,and the following formula for the finished foam agent is established:6.82%SDS+4.51%AES+0.57% dodeca-nol +0.2% cationic guar gum +87.9% water. Compared with other products at home and abroad, this new type of foam agent is an improvement in terms of performance index and economy.%文章根据土压平衡盾构隧道施工土体改良泡沫剂的技术要求,针对土压盾构所用泡沫剂的配方进行了研究.研究过程中,利用高速搅拌法对常见的表面活性剂进行了优选,确定以SDS为主发泡剂,用AES对SDS进行复配,试验结果表明,当SDS/AES复配比例为6:4、总浓度为3 g·L-1时,向体系中加入浓度为0.2 g·L-1的表面活性类稳泡剂十二醇和0.04 g·L-1的高分子聚合物类稳泡剂阳离子瓜尔胶,对该发泡体系具有很好的稳泡效果.由此得出经济、环保、发泡性能和稳泡性能良好的泡沫剂实验室配方,并进行了浓缩调整,得到了稳定均一的泡沫剂成品配方为6.82%SDS+4.51%AES+0.57%十二醇+0.2%阳离子瓜尔胶+87.9%水.新型泡沫剂的性能指标和经济性均优于国内外同类产品.