絮凝-分级式水平排水板真空预压法处理工程废泥浆试验研究  

Experimental study on the treatment of engineering waste slurry by flocculationgraded prefabricated horizontal drain vacuum preloading

作　　者：高紫阳[1,2,3] 李嘉明 王军 按打日拉[1,2] GAO Ziyang;LI Jiaming;WANG Jun;ANDA Rila(College of Civil Engineering and Architecture,Wenzhou University,Wenzhou,Zhejiang 325035,China;Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province,Wenzhou,Zhejiang 325035,China;Collaborative Innovation Center of Tideland Reclamation and Ecological Protection,Wenzhou,Zhejiang 325035,China;Zhejiang Engineering Research Center of Disaster Prevention and Mitigation for Coastal Soft Soil Foundation,Wenzhou,Zhejiang 325035,China)

机构地区：[1]温州大学建筑工程学院,浙江温州325035 [2]浙江省软弱土地基与海涂围垦工程技术重点实验室,浙江温州325035 [3]浙江省超软土工程技术与智能化监测国际科技合作基地,浙江温州325035 [4]滨海软土地基防灾减灾技术浙江省工程研究中心,浙江温州325035

出　　处：《岩石力学与工程学报》2024年第9期2329-2340,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金杰出青年项目(52325806);国家自然科学基金资助项目(52178348);温州市科技项目(ZS2023005)。

摘　　要：针对目前竖直排水板真空预压法(PVDVP)处理高含水工程废泥浆存在板材弯折和淤堵严重的问题,结合2种防淤堵技术——絮凝和分级法,提出絮凝-分级式水平排水板真空预压法(F-G-PHDVP)。该方法可在单技术基础上进一步缓解细颗粒迁移造成的淤堵问题。针对温州桩基废泥浆展开室内模型试验,对比分析传统、絮凝、絮凝-分级式3种真空预压法处理后的加固效果及淤堵情况,试验结果表明絮凝-分级式加固效果最佳。相对于传统组,絮凝组可提升十字板剪切强度83.5%;而在絮凝基础上絮凝-分级式排水量提升4.03%~12.73%,平均十字板剪切强度提升1.91%~5.66%,平均含水率降低1.66%~4.27%。絮凝-分级式真空预压法不仅增大了平均粒径,同时减缓了细颗粒的迁移,有效防止了淤堵的加剧,进一步提升了加固效果,其中,30-80 kPa真空压力的真空加载方式可进一步提升4.1%加固效率。为验证该方法对现场处理桩基废泥浆的可行性,结合工期因素选取30-80 kPa方案进行真空预压现场试验,结果证实该方案处理高含水废泥浆具有良好的加固效果。In response to the serious problems of plate bending and blockage in the treatment of high water content engineering waste slurry using vacuum preloading with vertical drainage(PVDVP),a coagulation grading horizontal drainage plate vacuum preloading method(F-G-PHDVP)is proposed by combining two anti-blockage technologiesflocculation and grading method.This method can further alleviate the clogging problem caused by fine particle migration.Indoor model tests were conducted on Wenzhou pile foundation waste mud to compare and analyze the reinforcement effect and blockage of traditional,flocculation,and flocculation-graded vacuum preloading methods.The test results showed that the grading flocculation method had the best reinforcement effect.Compared to the traditional group,the flocculation group can increase the vane shear strength by 83.5%.On the basis of flocculation,the flocculation graded drainage capacity is increased by 4.03%to 12.73%,the average vane shear strength is increased by 1.91%to 5.66%,and the average moisture content is reduced by 1.66%to 4.27%.The flocculationgraded vacuum preloading method not only increases the average particle size,but also effectively slows down the migration of fine particles,preventing the aggravation of clogging and further improving the reinforcement effect.Among them,the vacuum loading method of 30-80 kPa can further improve the reinforcement efficiency by 4.1%.To verify the feasibility of this method for on-site treatment of pile foundation waste mud,a 30-80 kPa scheme was selected for vacuum preloading field tests.The results confirmed that this scheme has a good reinforcement effect on high water content waste mud.

关 键 词：桩基工程 工程废泥浆 絮凝 分级式 水平排水板 防淤堵机制 

分 类 号：TU47[建筑科学—结构工程]