固结-固化复合技术分层加固淤泥的试验研究

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摘要 研究目的: 为了降低施工成本,采用分层法对软弱淤泥进行加固,在试验现场具体采用固结-固化复合技术对淤泥进行加固试验研究,使处理后的淤泥满足工程建设所需的特定承载力。对于地表浅层淤泥,采用固化技术进行固化处理,大幅度提升浅层土体强度;对于深层淤泥,采用真空预压技术使淤泥产生排水固结,以提高下卧层软土的强度。
研究结论: (1)固化剂可对浅层淤泥产生较为可观的固化效果,当固化剂掺量为4%~8%时,浅层固化土形成的硬壳层的承载力特征值为164~200 kPa;(2)淤泥仅采用真空预压加固,其承载力特征值仅为40 kPa,采用固结-固化复合技术对淤泥进行分层加固,当固化剂掺量为4%~8%时,双层地基整体的承载力特征值为96~170 kPa,浅层硬壳层对土体承载力提升效果显著;(3)对于双层地基而言,硬壳层具有一定的应力扩散作用,当固化剂掺量为4%时,浅层固化土的应力扩散角可达18.32°,可有效减小软弱下卧层的附加应力;(4)固结-固化复合技术可用于对滨海软土、淤泥回填土地基的大规模加固应用。

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	骆嘉成
	邵吉成

关键词 ：岩土工程, 固结固化复合技术, 分层加固法, 淤泥, 应力扩散角

Abstract：Research purposes: To save the construction cost, the layered reinforcement method is used to reinforce the soft sludge, and the consolidation and solidification composite technology is adopted to reinforce the sludge in the test site, so that the treated sludge can meet the bearing capacity requirements of the construction. For the shallow surface sludge, the solidification technology is used to greatly improve the strength of the shallow soil. For the deep sludge, the vacuum preloading technology is used to make the sludge consolidated by drainage, so as to improve the bearing capacity of the underlying stratum.
Research conclusions: (1) Solidified agent can generate considerable solidified effect on shallow sludge. When the solidified agent content is 4~8%, the characteristic value of bearing capacity in shallow solidified soil is 164~200 kPa. (2) The characteristic value of bearing capacity of sludge is just 40 kPa as the sludge is reinforced by only vacuum preloading. The consolidation and solidification composite technology is used to strengthen the sludge by layered reinforcement. When the solidified agent content is 4%~8%, the characteristic value of bearing capacity of the two-layered foundation is 96~170 kPa, and the shallow overlying crust has a significant effect on the soil bearing capacity. (3) For the two-layered foundation, the overlying crust has a certain stress diffusion effect. When the solidified agent content is 4%, the stress diffusion angle of the shallow solidified soil is 18.32°, which can effectively reduce the additional stress of the soft underlying stratum. (4) Consolidation and solidification composite technology can be used for large-scale reinforcement of coastal soft soil and sludge backfill soil foundation.

Key words： geotechnical engineering consolidation and solidification composite technology layered reinforcement method sludge stress diffusion angle

收稿日期: 2021-02-22

PACS:

TU411

基金资助:温州市基础性科研项目(S2020024)

作者简介: 骆嘉成,1968年出生,男,教授级高级工程师;^**邵吉成,1992年出生,男,工程师。

引用本文:

骆嘉成, 邵吉成. 固结-固化复合技术分层加固淤泥的试验研究[J]. 铁道工程学报, 2022, 39(11): 19-24.
LUO Jiacheng, SHAO Jicheng. Experimental Research on the Layered Reinforcement of Sludge by Consolidation and Solidification Composite Technology. Journal of Railway Engineering Society, 2022, 39(11): 19-24.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I11/19

[1]	陈富.软土表面硬壳层超固结比对路堤填筑影响数值模拟[J]. 地基处理,2020(6):497-503.Chen Fu. Numerical Simulation of Overconsolidation Ratio of Hard Crust Layer in Soft Soil on the Embankment Construction[J]. Chinese Journal of Ground Improvement,2020(6):497-503.
[2]	闫澍旺,郭炳川,孙立强,等.硬壳层在吹填土真空预压中的应用[J]. 岩石力学与工程学报,2013(7):1497-1503.Yan Shuwang,Guo Bingchuan,Sun Liqiang,etc. Application of Crust Layer to Vacuum Preloading Dredge Fill[J]. Chinese Journal of Rock Mechanics and Engineering,2013(7):1497-1503.
[3]	问延煦,周健. 封闭作用对双层地基临塑荷载的影响[J]. 岩土工程学报,2008(5):685-689.Wen Yanxu,Zhou Jian. Critical Edge Pressure Analysis of Two-layered Ground Considering Closure Effect[J]. Chinese Journal of Geotechnical Engineering,2008(5):685-689.
[4]	张波,石名磊,白世伟. 长江漫滩低路堤基底浅层固化层工作性状数值分析[J]. 岩土力学,2007(S1):839-843.Zhang Bo,Shi Minglei,Bai Shiwei. Study of Shallow Solidified Soil Layer of Low Embankment on the Yangtze River Floodplain by Fast Lagrange Method[J]. Rock and Soil Mechanics,2007(S1):839-843.
[5]	邵吉成,袁波,骆嘉成,等. 固化剂加固温州淤泥的物理力学性质研究[J]. 地下空间与工程学报,2022(3):935-944.Shao Jicheng,Yuan Bo,Luo Jiacheng,etc. Research on the Physical and Mechanical Properties of Wenzhou Silt Reinforced by Solidified Agent[J]. Chinese Journal of Underground Space and Engineering,2022(3):935-944.
[6]	甘雅雄,朱伟,吕一彦,等. 从水分转化研究早强型材料固化淤泥的早强机理[J]. 岩土工程学报,2016(4):755-760.Gan Yaxiong,Zhu Wei,Lv Yiyan,etc. Early-strength Mechanism of Cementitious Additives from Perspective of Water Conversion[J]. Chinese Journal of Geotechnical Engineering,2016(4):755-760.
[7]	汪洪星,柯睿,谈云志,等. 膨润土对固化淤泥土抗冻融性能的提升效应[J]. 硅酸盐通报,2018(9):2924-2929.Wang Hongxing,Ke Rui,Tan Yunzhi,etc. Promotion Effect of Freezing-Thawing Resistance of Stabilized /Solidified Sediments by Bentonite[J]. Bulletin of the Chinese Ceramic Society,2018(9):2924-2929.
[8]	曹海莹,窦远明. 上硬下软型双层路基应力扩散特征及工程应用[J]. 公路交通科技,2012(2): 29-34.Cao Haiying,Dou Yuanming. Characteristics of Dry Crust′s Stress Dispersion in Two-layer Roadbed and Its Engineering Application[J]. Journal of Highway and Transportation Research and Development,2012(2):29-34.