Abstract:Based on the chemical-physical combined method(CPCM) to more efficiently increase consolidation effects of soft clay or clay slurry and incorporated with the advanced vacuum preloading(VP) technique with vertical drains,new lab testing results of three-dimensional consolidation on the chemically treated Pearl Rivel marine clay under VP were presented;while parallel tests with pure marine clay under VP were conducted. The testing results show that the consolidation rate of the models using CPCM is obviously faster than that using conventional VP method. Within the same consolidation time,the compressive strength of the consolidated soil achieved by CPCM is much higher than that achieved only by applying VP. Furthermore,the similar tests conducted on Singapore marine clay also supported the findings that CPCM has super effectiveness and advantages. This totally new CPCM has therefore high development potentials for both academic research and engineering application especially in land reclamation.
[1] TANG M,SHANG J Q. Vacuum preloading consolidation of Yaoqiang airport runway[J]. Geotechnique,2000,50(6):613–623.
[2] XU S L,LU X M,LIU C M. Field trials of the vacuum compaction method for soil improvement[C]// Proceedings of the 9th Chinese National Geotechnical Conference. Beijing:[s.n.],2003:736–739.
[3] YAN H S,CAO D Z. Application of low-level vacuum preloading technique in offshore projects[J]. Ocean and River Hydraulics,2005,(3):41–43.
[4] WU D Q. Improvement of clay slurry for land reclamation[Ph. D. Thesis][D]. Singapore:Nanyang Technological University,1994.
[5] 颜永国,董志良,杨昌斌,等. 颗粒级配对真空预压法处理吹填土效果影响试验[J]. 岩土工程学报,2011,33(11):1 775–1 778.(YAN Yongguo,DONG Zhiliang,YANG Changbin,et al. Experimental study on effect of grain size distribution on improvement of dredger fill[J]. Chinese Journal of Geotechnical Engineering,2011,33(11):1 775–1 778.(in Chinese))
[6] 张春雷,汪顺才,朱 伟,等. 初始含水率对水泥固化淤泥效果的影响[J]. 岩土力学,2008,29(增1):567–570.(ZHANG Chunlei,WANG Shuncai,ZHU Wei,et al. Influence of initial water content on cement solidification effect of dredged material[J]. Rock and Soil Mechanics,2008,29(Supp.1):567–570.(in Chinese))
[7] SATO T,KATO H. Application of the pneumatic flow mixing method to land development for central Japan international airport[C]// Proceedings of the 2002 International symposium on Underwater technology. Tokyo,Japan:[s.n.],2002:93–98.
[8] WU D Q,BROMS B B,CHOA V. Stabilization of soft clay with flyash and by vacuum preloading for land reclamation[C]// International Conference on Geotechnical Engineering. Johor Bahru,Malaysia:[s.n.],1992:21–23.
[9] SUHAIMI H G,WU D Q. Review of chemical stabilization technologies and applications for public roads in Brunei Darussalam[J]. The Journal of Road Engineering Association of Asia and Australia,2003,10(1):42–53.
[10] KOH M S,LIM B C,WU D Q. Chemical-soil stabilization for runway shoulders widening at Singapore Changi Airport[C]// Proceedings of the 4th Asia Pacific Conference on Transportation and Environment. Xi?an:[s.n.],2005:8–10.
[11] WU D Q. A green and effective approach for pavements in tropical region[C]// Proceedings of the 24th ICTPA Annual Conference and NACGEA International Symposium on Geo-Trans. Los Angeles,CA:[s.n.],2011:1–12.
[12] SAFRY K A,WU D Q,HUANG F. Over-coming differential settlement in soft grounds using ‘floating semi-rigid pavement’[C]// Proceedings of the 14th REAAA Conference 2013. Kuala Lumpur,Malaysia:[s.n.],2013:445–452.
[13] 梁文泉,何 真,李亚杰,等. 土壤固化剂的性能及固化机理的研究[J]. 武汉水利电力大学学报,1995,28(6):675–679.(LING. Wenquan,HE Zhen,LI Yajie,et al. A study on the properties of the soil hardening agent and its hardening mechanism[J]. Journal of Wuhan University of Hydraulic and Electric Engineering,1995,28(6):675–679.(in Chinese))
[14] 曹玉鹏,卞 夏,邓永锋. 高含水率疏浚淤泥新型复合固化材料试验研究[J]. 岩土力学,2011,32(增1):321–326.(CAO Yupeng,BIAN Xia,DENG Yongfeng. Solidification of dredged sludge with high water content by new composite additive[J]. Rock and Soil Mechanics,2011,32(Supp.1):321–326.(in Chinese))
[15] 黄 新,许 晟,宁建国. 含铝固化剂固化软土的试验研究. 岩石力学与工程学报,2007,26(1):156–161.(HUANG Xin,XU Sheng,NING Jianguo. Experimental research on stabilized soft soils by alumina bearing modifier[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(1):156–161.(in Chinese))