Please wait a minute...
浙江大学学报(工学版)  2018, Vol. 52 Issue (4): 735-743    DOI: 10.3785/j.issn.1008-973X.2018.04.017
土木工程     
基于骨架构建药剂真空预压法加固超软土试验
武亚军1, 顾赛帅1, 强小兵2, 黄伟钧2, 卢立海2, 骆嘉成2
1. 上海大学 土木工程系, 上海 200072;
2. 温州浙南地质工程有限公司, 浙江 温州 325006
Experimental study on ultra-soft soil reinforced by vacuum preloading with flocculation based on skeleton construction
WU Ya-jun1, GU Sai-shuai1, QIANG Xiao-bing2, HUANG Wei-jun2, LU Li-hai2, LUO Jia-cheng2
1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China;
2. Wenzhou Zhenan Geology Engineering Limited Company, Wenzhou 325006, China
 全文: PDF(4928 KB)   HTML
摘要:

针对温州某工程中的高含水率超软土,通过添加不同药剂结合真空预压开展模型桶试验,对真空度、排水速率和含水率进行测试;选取工程实际中可行性较高的药剂开展模型池现场试验,探究不同药剂对土颗粒粒径及渗透性的影响.从两种试验可以得到如下结论:1)模型试验中,经固化剂或絮凝剂+固化剂结合真空预压处理废浆可以获得较好的加固效果.2)加入固化剂能够快速改变土体的界限含水率和抗压性能,通过胶结力生成骨架结构而增加了超软土渗透性,使真空排水阶段含水率降低120%.3)絮凝剂通过长链“架桥”吸附土颗粒生成链状体,絮凝脱水效果好,絮体含水率直接降低80%,但在真空阶段时渗透性较差,排水速率较慢;絮凝剂和固化剂组合添加不仅可以得到好的絮凝效果,而且由于固化剂的骨架构建作用使其在真空预压阶段具有良好的渗透特性.研究表明,基于骨架构建的药剂真空预压法加固超软土的效果十分显著.

Abstract:

The tests were conducted by adding different chemicals and vacuum preloading aiming at the ultra-soft soil in a project in Wenzhou. The vacuum degree, drainage rate and moisture content were tested. Then the high feasibility of the agent was selected to conduct the model pool field test. The effects of different agents on the particle size and permeability of soil particles were analyzed. 1) In the model test, it is possible to obtain a better effect on the treatment of waste slurry by curing agent or flocculant+curing agent combined with vacuum preloading. 2) The addition of curing agent can quickly change the limit water content and compressive properties of the soil. The skeleton structure can be formed by the cementation force, thus increasing the permeability, and the moisture content of the vacuum drainage stage can be reduced by 120%. 3) Flocculant uses long chain bridging adsorption of soil particles to form a chain like body and obtain good effect of flocculation dewatering. In the process of sedimentation, water mass fraction decreases 80%. Under vacuum load, the permeability is low and the drainage rate is slow. The combination of flocculant and curing agent not only can get good flocculation effect, but also has good permeability in the vacuum preloading stage due to the structure of the curing agent. Results show that the vacuum preloading method based on skeleton builders is very effective in the treatment of super soft soil.

收稿日期: 2017-01-15
CLC:  TU472  
基金资助:

国家自然科学基金资助项目(41772303);上海市自然科学基金资助项目(17ZR1410100).

作者简介: 武亚军(1973-),男,副教授,从事岩土工程中软地基处理、废浆处理、地下工程等研究.orcid.org/0000-0003-1656-0830.E-mail:wyjdldz@163.com
服务  
把本文推荐给朋友
加入引用管理器
E-mail Alert
作者相关文章  

引用本文:

武亚军, 顾赛帅, 强小兵, 黄伟钧, 卢立海, 骆嘉成. 基于骨架构建药剂真空预压法加固超软土试验[J]. 浙江大学学报(工学版), 2018, 52(4): 735-743.

WU Ya-jun, GU Sai-shuai, QIANG Xiao-bing, HUANG Wei-jun, LU Li-hai, LUO Jia-cheng. Experimental study on ultra-soft soil reinforced by vacuum preloading with flocculation based on skeleton construction. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2018, 52(4): 735-743.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2018.04.017        http://www.zjujournals.com/eng/CN/Y2018/V52/I4/735

[1] 武亚军, 邹道敏, 唐军武, 等. 吹填软土植物垫层真空预压现场试验研究[J]. 岩石力学与工程学报, 2011, 30(增2):3574-3583. WU Ya-jun,ZOU Dao-min,TANG Jun-wu,et al. Study of ground treatment of dredger fill in-situ test with stalk cushion using vacuum preloading method[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(supple.2):3574-3583.
[2] 武亚军, 杨建波, 张孟喜. 真空加载方式对吹填流泥加固效果及土颗粒移动的影响研究[J]. 岩土力学, 2013, 34(8):2129-2135. WU Ya-jun, YANG Jian-bo, ZHANG Meng-xi. Study of impact of vacuum loading mode on dredger fill flow mud consolidation effect and soil particles moving[J]. Rock and Soil Mechanics, 2013, 34(8):2129-2135.
[3] 苑晓青, 王清, 孙铁, 等. 分级真空预压法加固吹填土过程中孔隙分布特征[J]. 吉林大学学报:地球科学版, 2012, 42(1):169-176. YUAN Xiao-qing, WANG Qing, SUN Tie, et al. Pore distribution characteristics of Dedger fill during hierarchical vacuum preloading[J]. Journal of Jilin University:Earth Science Edition, 2012, 42(1):169-176.
[4] 周蓉, 张洪弟. 土工织物渗透性能评价及其工程意义[J]. 纺织学报, 2000, 21(3):180-183. ZHOU Rong, ZHANG Hong-di. Assessment and engineering significance of geotextiles permeability[J]. Journal of Textile Research, 2000, 21(3):180-183.
[5] 陈轮, 童朝霞. 拉应变对土工织物-非连续级配土淤堵特性的影响[J]. 水力发电学报, 2003, 32(2):97-102. CHEN Lun, TONG Zhao-xia. Effects of tensile strain of the geotextile on clogging behavior in geotextile-gap graded soil filtering systems[J]. Journal of Hydroelectric Engineering, 2003, 32(2):97-102.
[6] 王军, 蔡袁强, 符洪涛, 等. 新型防淤堵真空预压法室内与现场试验研究[J]. 岩石力学与工程学报, 2014, 33(6):1257-1268. WANG Jun, CAI Yuan-qiang, FU Hong-tao, et al. Indoor and field test on vacuum preloding with new anti-clogging measures[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(6):1257-1268.
[7] 章定文, 刘松玉, 顾沉颖, 等. 土体气压劈裂的室内模型试验[J]. 岩土工程学报, 2009, 31(12):1925-1929. ZHANG Ding-wen, LIU Song-yu, GU Chen-ying, et al. Model tests on pneumatic fracturing in soils[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(12):1925-1929.
[8] 韩文君, 刘松玉, 章定文. 土体气压劈裂裂隙扩展特性及影响因素分析[J]. 土木工程学报, 2011, 44(9):87-93. HAN Wen-jun, LIU Song-yu, ZHANG Ding-wen. Characteristics and influencing factors analysis of propagation of pneumatic fracturing in soils[J]. China Civil Engineering Journal, 2011, 44(9):87-93.
[9] 沈宇鹏, 冯瑞玲, 余江, 等. 增压式真空预压处理软基的加固机理[J]. 吉林大学学报:地球科学版, 2012, 42(3):792-797. SHEN Yu-peng, FENG Rui-ling, YU Jiang, et al. Reinforcement of vacuum preloading with air pressure boosted for soft ground treatment[J]. Journal of Jilin University:Earth Science Edition, 2012, 42(3):792-797.
[10] 杨春英, 徐薇, 白晨光. 施工废弃泥浆絮凝脱水试验及机理分析[J]. 环境科技, 2013, 26(5):15-17. YANG Chun-ying, XU Wei, BAI Chen-guang. The mud flocculation dehydration test and mechanism analysis[J]. Environmental Science and Technology, 2013, 26(5):15-17.
[11] BESRA L, SENGUPTA D K. Influence of polymer adsorption and conformation on flocculation and dewatering of kaolin suspension[J]. Separation and Purification Technology, 2004, 37(3):231-246.
[12] NASSER M S, JAMES A E. The effect ofpolyacrylamide charge density and molecular weight on the flocculation and sedimentation behaviour of kaolinite suspensions[J]. Separation and Purification Technology, 2006, 52(2):241-252.
[13] MAREK S Z, ROGER S C S, GAYLE E M. Kaolinite flocculation structure[J]. Journal of Colloid and Interface Science, 2008, 328(1):73-80.
[14] 李冲, 吕志刚, 陈洪龄, 等. 阴离子型聚丙烯酰胺在废弃桩基泥浆处理中的应用[J]. 环境科技, 2012, 25(1):33-37. LI Chong, LV Zhi-gang, CHEN Hong-ling, et al. Application of anionic polyacrylamide in treating waste slurry from pile foundation engineering[J]. Environmental Science and Technology, 2012, 25(1):33-37.
[15] 赵森, 曾芳金, 王军, 等. 絮凝-真空预压加固吹填淤泥试验研究[J]. 岩石力学与工程学报, 2016, 35(6):1291-1296. ZHAO Sen,ZENG Fang-jin,WANG Jun, et al. Experimental study of flocculation combined with vacuum preloading to reinforce silt foundation[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(6):1291-1296.
[16] 武亚军, 陆逸天, 牛坤, 等. 药剂真空预压法处理工程废浆试验[J]. 岩土工程学报, 2016, 38(8):1365-1373. WU Ya-jun, LU Yi-tian, NIU Kun, et al. Experimental study on solid-liquid separation of construction waste slurry by additive agent-combined vacuum preloading[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8):1365-1373.
[17] 武亚军, 陆逸天, 骆嘉成, 等. 药剂真空预压法在工程废浆处理中的防淤堵作用[J]. 岩土工程学报, 2017, 39(3):525-532. WU Ya-jun, LU Yi-tian, LUO Jia-cheng, et al. Anti-clogging function of vacuum preloading with flocculant in solid-liquid separation of construction vaste slurry[J]. Chinese Journal of Geotechnical Engineering. 2017, 39(3):525-532.
[18] ZALL J, REHBUN M. Skeleton builders for conditioning oily sludge[J]. Journal-Water Pollution Control Federation, 1987, 59(7):699-706.
[19] BORÁ J, HOUDKOVÁ L, ELSÄβER T. Processing of sewage sludge:dependence of sludge dewatering efficiency on amount of flocculant[J]. Resources Conservation and Recycling, 2010, 54(5):278-282.
[20] BENÍTEZ J, RODRÍGUEZ A, SUÁREZ A. Optimization technique for sewage sludge conditioning with polymer and skeleton builders[J]. Water Research, 1994, 28(10):2067-2073.
[21] THAPA K B, QI Y, HOADLEY A F A. Interaction of polyelectrolyte with digested sewage sludge and lignite in sludge dewatering[J]. Colloids and Surfaces A Physicochemical and Engineering Aspects, 2009, 334(1-3):66-73.
[22] LI Y L, LIU J W, CHEN J Y, et al. Reuse of dewatered sewage sludge conditioned with skeleton builders as landfill cover material[J]. International Journal of Environmental Science and Technology, 2014, 11(1):233-240.
[23] YANG J, ZHANG S, SHI Y, et al. Direct reuse of two deep-dewatered sludge cakes without a solidifying agent as landfill cover geotechnical properties and heavy metal leaching characteristics[J]. RSC Advances, 2017, 7(7):3823-3830.
[24] ZHAO Y Q. Enhancement of alum sludge dewatering capacity by using gypsum as skeleton builder[J]. Colloids and Surfaces A Physicochemical and Engineering Aspects, 2002, 211(2/3):205-212.
[25] LEE D Y, JING S R, LIN Y F. Using seafood waste as sludge conditioners[J]. Water Science and Technology A Journal of the International Association on Water Pollution Research, 2001, 44(10):301-307.
[26] CHEN C Y, ZHANG P Y,ZENG G M, et al. Sewage sludge conditioning with coal fly ash modified by sulfuric acid[J]. Chemical Engineering Journal, 2010, 158(3):616-622.
[27] 时亚飞, 杨家宽, 李亚林, 等. 基于骨架构建的污泥脱水/固化研究进展[J]. 环境科学与技术, 2011, 34(11):70-75. SHI Ya-fei, YANG Jia-kuan, LI Ya-lin, et al. Review on sludge dewatering and solidification based on skeleton builders[J]. Environmental Science and Technology, 2011, 34(11):70-75.
[28] 余志荣, 郁雨苍, 高廷耀, 等. 石灰在污泥调治中的应用及作用机理研究[J]. 中国给水排水, 1989, 5(6):7-11. YU Zhi-rong, YU Yu-cang, GAO Ting-yao, et al. The application and mechanism of lime in sludge modulation conditioning[J]. China Water and Wastewater, 1989, 5(6):7-11.
[29] 黄英豪, 朱伟, 张春雷, 等. 固化淤泥重塑土力学性质及其强度来源[J]. 岩土力学, 2009, 30(5):1352-1356. HUANG Ying-hao, ZHU Wei, ZHANG Chun-lei, et al. Mechanical characteristics and strength source of remolded solidified dredged material[J]. Rock and Soil Mechanics, 2009, 30(5):1352-1356.
[30] ZHU W, ZHANG C L, CHIU C F. Soil-water transfer mechanism for solidified dredged materials[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(5):588-598.
[31] HUANG Y H, ZHU W, QIAN X D, et al. Change of mechanical behavior between solidified and remolded solidified dredged materials[J]. Engineering Geology, 2011, 119(34):112-119.
[32] 鲍树峰, 董志良, 莫海鸿, 等. 高黏粒含量新吹填淤泥加固新技术室内研发[J]. 岩土力学, 2015, 36(1):61-67. BAO Shu-feng, DONG Zhi-liang, MO Hai-hong, et al. Laboratory tests on new reinforcement technology of newly hydraulic reclamation mud with high clay content[J]. Rock and Soil Mechanics, 2015, 36(1):61-67.
[33] 刘禹杨, 吴燕, 胡保安, 等. 疏浚底泥掺外加剂真空预压脱水技术研究[J]. 水利水运工程学报, 2013(3):78-82. LIU Yu-yang, WU Yan, HU Bao-an, et al. Research on dehydration technology of dredged sludge by admixture and vacuum preloading[J]. Hydro-Science and Engineering, 2013(3):78-82.
[34] 王建勋, 王保田. 真空预压联合石灰稳定法改良淤泥土试验研究[J]. 岩土力学, 2008, 29(增刊):575-579. WANG Jian-xun, WANG Bao-tian. Testal study of vacuum preloading of lime stabilized sludge[J]. Rock and Soil Mechanics, 2008, 29(supplement):575-579.
[35] 刘忠, 刘含笑, 冯新新, 等. 超细颗粒物聚并模型的比较研究[J]. 燃烧科学与技术, 2012, 18(3):212-216. LIU Zhong, LIU Han-xiao, FENG Xin-xin, et al. Comparative study on the different coalescence models of ultrafine particles[J]. Journal of Combustion Science and Technology, 2012, 18(3):212-216.[STHZ

[1] 黄铭枫, 李强, 涂志斌, 楼文娟. 基于Copula函数的杭州地区多风向极值风速估计[J]. 浙江大学学报(工学版), 2018, 52(5): 828-835.
[2] 李卓峰, 林伟岸, 朱瑶宏, 边学成, 叶俊能, 高飞, 陈云敏. 坑底加固控制地铁基坑开挖引起土体位移的现场测试与分析[J]. 浙江大学学报(工学版), 2017, 51(8): 1475-1481.