有机质对水泥固化淤泥土的力学特性影响试验研究

doi:10.12052/gdutxb.190022

摘要/Abstract

摘要： 针对有机质对水泥固化淤泥土强度的不良影响，在南沙淤泥土干粉中添加腐殖酸配制得到不同有机质质量分数的淤泥土，采用不同质量分数的水泥对其进行固化，进行无侧限抗压强度试验，探讨了水泥及有机质质量分数、龄期对固化的有机质淤泥土无侧限抗压强度的影响.试验结果表明：有机质的存在严重阻碍水泥的水化反应，但有机质质量分数对水泥固化淤泥土强度的影响是有极限的，超过5%时，有机质质量分数的增加对固化土强度下降的影响就不明显了；固化土的强度随水泥质量分数的增加呈幂函数形式增长；随龄期的增长，含有机质的水泥土强度仍远低于普通水泥土的强度，表明有机质的影响并不会随龄期增长而减小.

关键词: 有机质, 水泥土, 固化, 广州南沙淤泥土, 无侧限抗压强度

Abstract: In order to study the adverse influences of organic matter on the strength of cementing solidified silt, humic acid was added to the dry silt to prepare silt with different organic matter content, then it was reinforced with different mass fractions of cement. The unconfined compressive strength test was used to analyze the content of organic matter and the effects of age on UCS of solidified organic silt. The test results show that the existence of organic matter seriously hinders the hydration reaction of cement, but the influence of organic matter on the strength of cementing solidified silt is limited, and beyond this limit (5%), the effect of the increase of organic matter content on the strength decline of cementing solidified silt is not obvious. The strength of cementing solidified silt increases exponentially with the increase of cement content. As the age increases, the strength of organic cementing solidified silt is still far lower than that of ordinary cementing solidified silt, indicating that the influence of organic matter does not decrease with age.

Key words: organic matter, cement soil, reinforcement, Nansha silt in Guangzhou, unconfined compressive strength

中图分类号:

TU472.6

梁仕华, 周锦程, 罗祺, 林焕生. 有机质对水泥固化淤泥土的力学特性影响试验研究[J]. 广东工业大学学报, 2019, 36(06): 86-91.

Liang Shi-hua, Zhou Jin-cheng, Luo Qi, Lin Huan-sheng. An Experimental Research on the Effect of Organic Matter on Mechanical Properties of Cementing Solidified Silt[J]. Journal of Guangdong University of Technology, 2019, 36(06): 86-91.

参考文献 20

[1] HORPIBULSUK S, RACHAN R, SUDDEEPONG A. Assessment of strength development in blended cement admixed Bangkok clay[J]. Construction and Building Materials, 2011, 25(4):1521-1531
[2] HORPIBULSUK S, SHIBUYA S, FUENKAJORN K, et al. Assessment of engineering properties of Bangkok clay[J]. Canadian Geotechnical Journal, 2007, 44(2):173-187
[3] AZUMA K, OHISHI K, ISHIII T, et al. Application of FGC deep mixing to the braced excavation[C]//Soft Ground Engineering in Coastal Areas, Yokosuka, Japan:Nakase Memorial Symposium, 2003:223-232.
[4] 潘钦生, 张可能, 周波, 等. 广州南沙软土工程特性分析[J]. 岩土工程界, 2006, 9(4):46-48 PAN Q S, ZHANG K N, ZHOU B, et al. Analysis of engineering characteristics of Nansha soft soil in Guangzhou[J]. Geotechnical Engineering World, 2006, 9(4):46-48
[5] 徐醒华, 杨涛, 黄锦荣, 等. 土壤有机质质量分数对深层搅拌桩成桩质量的影响[J]. 广东土木与建筑, 2004(10):41-42 XU X H, YANG T, HUANG J R, et al. Effect of soil organic matter content on pile quality of deep mixing pile[J]. Guangdong Civil Engineering & Construction, 2004(10):41-42
[6] 朱伟, 曾科林, 张春雷. 淤泥固化处理中有机物成分的影响[J]. 岩土力学, 2008, 29(1):33-36 ZHU W, ZENG K L, ZHANG C L. Influence of organic matter component on solidification of dredged sediment[J]. Rock and Soil Mechanics, 2008, 29(1):33-36
[7] 梁仕华, 张朗, 周世宗. 水泥基固化剂固化南沙软土的力学及微观试验研究[J]. 广东工业大学学报, 2015, 32(2):17-22 LIANG S H, ZHANG L, ZHOU S Z, et al. Experimental research of mechanics and microscopic on nansha soft soil reinforced with cement-based curing agent[J]. Journal of Guangdong University of Technology, 2015, 32(2):17-22
[8] 梁仕华, 罗祺, 王蒙, 等. 石灰与水泥固化南沙锌污染软土试验研究[J]. 广东工业大学学报, 2017, 34(5):80-85 LIANG S H, LUO Q, WANG M, et al. An experimental study of nansha zinc contaminated sludge solidification with cement and lime[J]. Journal of Guangdong University of Technology, 2017, 34(5):80-85
[9] 梁仕华, 曾伟华. 干湿循环条件下水泥粉煤灰固化南沙淤泥土试验研究[J]. 工业建筑, 2018(7):83-86 LIANG S H, ZENG W H. Experimental study of Nansha silt soil reinforced with cement and fly-ash during wetting-drying cycles[J]. Industrial Construction, 2018(7):83-86
[10] 梁仕华, 林焕生, 周世宗, 等. 聚丙烯纤维与水泥固化广州南沙软土的试验研究[J]. 工业建筑, 2018, 48(7):87-90. LIANG S H, LIN H S, ZHOU S Z, et al. Experimental research on polypropylene fiber and cement reinforced Nansha soft soil in Guangzhou[J]. Industrial Construction, 2018, 48(7):87-90.
[11] BOOTH J, DAHL A. A note on the relationships between organic matter and some geotechnical properties of a marine sediment[J]. Marine Geotechnology, 1985, 6(3):281-297
[12] 罗祺. 水泥基外掺剂固化南沙有机质软土工程性质研究[D]. 广州:广东工业大学, 2018.
[13] 郭丽敏, 李洲, 朱剑锋, 等. 有机质土的固化试验[J]. 中国科技论文, 2015, 10(9):1076-1079 GUO L M, LI Z, ZHU J F, et al. Experimental study on the stabilization of organic soil[J]. China Science Paper, 2015, 10(9):1076-1079
[14] TREMBLAY H, DUCHESNE J, LOCAT J, et al. Influence of the nature of organic compounds on fine soil stabilization[J]. Canadian Geotechnical Journal, 2002, 39(3):535-546
[15] 范昭平. 有机质对淤泥固化的影响机理及对策研究[D]. 南京:河海大学, 2004.
[16] 刘叔灼, 巴凌真, 杨医博, 等. 有机质质量分数对水泥土强度影响的试验研究[J]. 武汉理工大学学报, 2009, 31(7):40-43 LIU S Z, BA L Z, YANG Y B, et al. Research on the influence of organic content on the strength of cement-stabilized soil[J]. Journal of Wuhan University of Technology, 2009, 31(7):40-43
[17] 吴军, 汪洪星, 谈云志, 等. 腐殖酸对污泥固化土长期强度的劣化效应[J]. 长江科学院院报, 2017, 34(8):130-134 WU J, WANG H X, TAN Y Z, et al. Degradation effect of humic acid on long-term strength of solidified sludge soil[J]. Journal of Yangtze River Scientific Research Institute, 2017, 34(8):130-134
[18] 徐日庆, 郭印, 刘增永. 人工制备有机质固化土力学特性试验研究[J]. 浙江大学学报(工学版), 2007, 41(1):109-113 XU R Q, GUO Y, LIU Z Y. Experimental study on mechanical properties of stabilized artificial organic soil[J]. Journal of Zhejiang University (Engineering Science), 2007, 41(1):109-113
[19] 徐日庆, 李俊虎, 蔡承晟, 等. 用固化剂GX08加固杭州海湖相软土的强度特性研究[J]. 岩土力学, 2014, 35(6):1528-1533 XU R Q, LI J H, CAI C S, et al. Study of strength characteristics of stabilized soil by using stabilizing agent GX08 treating marine and lacustrine soft soil in Hangzhou[J]. Rock and Soil Mechanics, 2014, 35(6):1528-1533
[20] 徐光苗. 寒区岩体低温、冻融损伤力学特性及多场耦合研究[J]. 岩石力学与工程学报, 2007, 26(5):1078 XU G M. Study on mechanical characteristics and multiphysical coupling problems of rock at low temperatures[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(5):1078

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