断层破碎带泥水盾构绿色泥浆试验研究

Experimental study on environment-friendly slurry for slurry shield in fault fracture zone

为解决大部分泥水盾构所用泥浆难以降解、污染性强、废浆量大、制浆成本高等问题,提出几种价格低廉、绿色环保的泥浆添加剂,并通过试验分析各添加剂对泥浆性能指标的影响,最终建议将麦芽糊精作为泥浆添加剂代替传统泥浆添加剂。根据断层破碎带的特点,提出一种绿色经济、适用性强的泥浆配比,即水∶黏土∶膨润土∶无水碳酸钠∶麦芽糊精=700∶90~120∶90~110∶2~3∶30~50。所提出的绿色泥浆添加剂以及配比可为类似工程现场施工提供借鉴和指导。

Most of the mud used by the slurry shield is difficult to degrade,highly pollutant and generates large amount of waste slurry and high cost.In order to solve these problems,several low cost and environment-friendly mud additives were presented and the effects of these additives on the performance index of mud were analyzed through experiments.The study proposed to replace traditional mud additives with maltdextrin.Considering the characteristics of fault fracture zone,a green and economic ratio with wide applicability for composing mud is proposed,namely,water∶clay∶bentonite∶anhydrous sodium carbonate∶maltodextrin=700∶90~120∶90~110∶2~3∶30~50.The green mud additive and its ratio proposed can provide reference and guidance for similar projects.