同济大学学报（自然科学版）2024，Vol.52Issue(7)：991-999,9.DOI:10.11908/j.issn.0253-374x.23422
化学絮凝与消泡材料对盾构渣土渗流性能的作用机理
Mechanisms of Chemical Flocculation and Defoaming Materials on Seepage Characteristics of Shield Tunneling Residue
摘要
Abstract
To promote the resource utilization of shield tunneling residue,this paper focuses on the complex composition,high moisture content,and poor permeability of earth pressure balance(EPB)shield tunneling residue.In combination with penetration test,mercury injection test,and computed tomography(CT),the multi-scale seepage characteristics of shield tunneling residue were analyzed,and the effect and mechanism of flocculant cationic polyacrylamide(CPAM)and defoamer organosiloxane on the permeability of the residue were investigated.The results show that the permeability of shield tunneling residue is affected by the foam in residue,and the permeability coefficient is finally stable around 7.72×10-6cm∙s-1.The residue has a high porosity,small pore size,and poor penetration.The addition of CPAM can improve the permeability of the residue due to the adsorption bridging and electric neutralization effects.However,excessive flocculant will inhibit the seepage.The optimal dosage of CPAM in this experiment is 0.30%,and the maximum permeability coefficient can reach 2.55×10-5 cm∙s-1.As the content of organosiloxane defoamer increases,the permeability coefficient of the residue increases,which can quickly eliminate the foam and improve the connectivity of seepage channel.The optimal dosage for this experiment is 0.20%,and the permeability coefficient can reach 1.31×10-5 cm∙s-1.关键词
盾构渣土/渗流/絮凝剂/消泡剂Key words
shield tunneling residue/seepage/flocculant/defoamer分类
建筑与水利引用本文复制引用
陈庆,陈沈旖,阳栋,官林星..化学絮凝与消泡材料对盾构渣土渗流性能的作用机理[J].同济大学学报（自然科学版）,2024,52(7):991-999,9.基金项目
国家重点研发计划(2022YFC3803104) （2022YFC3803104）
国家自然科学基金(52078381,51878496,52122808,51878480,52078369,U22B2076,51878481). （52078381,51878496,52122808,51878480,52078369,U22B2076,51878481）
