桩基施工泥浆固化处理新技术的应用研究

Application Research on New Technology of Mud Solidification Treatment in Pile Foundation Construction

桩基工程施工废弃泥浆直接排放的污染风险较大,需要对其进行处理。因此,以某桩基工程施工废弃泥浆经过絮凝和脱水处理后的絮凝体为研究对象,开展了泥浆固化处理实验研究,以固结体的无侧限抗压强度为评价指标,主要考察了固化剂类型、固化剂掺量、泥浆絮凝体含水量、养护温度和养护时间等因素对固化处理效果的影响。结果表明:不同类型固化剂的加入均能提高固结体的无侧限抗压强度,其中新型复合固化剂GT-2的固化处理效果最好。当实验用泥浆絮凝体的含水量固定在40%时,目标桩基施工废弃泥浆固化处理的最佳实验参数为:选择固化剂类型为新型复合固化剂GT-2,固化剂的掺量为6%,养护温度为35℃,养护时间为28 d。在此实验条件下泥浆固结体的无侧限抗压强度值可以达到0.631 MPa,达到了良好的固化处理效果。现场应用结果表明,新型复合固化剂GT-2的加入能够对现场桩基施工废弃泥浆起到较好的固化效果,并且处理成本较低,具有良好的环境、经济和社会效益。

The direct discharge of waste mud from pile foundation construction poses a significant pollution risk and requires treatment.Therefore,an experimental study on mud solidification treatment was conducted on the flocculated and dehydrated waste mud from a pile foundation construction project.The unconfined compressive strength of the solidified body was used as the evaluation index,and the effects of factors such as the type of curing agent,the amount of curing agent added,the water content of the mud slurry flocculated body,curing temperature,and curing time on the solidification treatment effect were mainly investigated.The results showed that the addition of different types of curing agents could improve the unconfined compressive strength of the solidified body,among which the new composite curing agent GT-2 had the best curing treatment effect.When the water content of the slurry flocculent used in the experiment was fixed at 40%,the optimal experimental parameters for the solidification treatment of the waste slurry from the construction of the target pile foundation were as follows:selecting new composite curing agent GT-2,dosage 6%,curing temperature 35℃,and curing time 28 d.Under this experimental condition,the unconfined compressive strength value of the mud consolidated body could reach 0.631 MPa,achieving a good solidification treatment effect.The on-site application results showed that the addition of the new composite curing agent GT-2 could have good solidification effect on the waste mud during on-site pile foundation construction,and the treatment cost was low,with good environmental,economic,and social benefits.