Effects of Cement/Basalt Fiber Composite Curing Agents on Static Characteristics of Peat Soil

Abstract

Abstract: In order to study the effect of single-doped cement and composite curing agent (composed of cement, raw basalt fiber, lime and raw plaster) on the static characteristics of plateau lacustrine peat soil in the Dianchi Lake area, a static triaxial non-consolidation and non-drainage shear test was carried out on cement improved soil and composite curing agent improved soil at different dosage levels, and the triaxial stress strain relationship and shear strength change law of the two improved soils were studied. The results show that with the increase of the dosage, the peak strength of the main stress difference between the two improved soils increases. When the mass fraction of the composite curing agent is 15%, compared with the two doping levels of 5% and 10%, the triaxial stress-strain relationship of the compound curing agent modified soil is changed from “strain hardening type” to “strain softening type”, and the shear strength is significantly improved. When the internal structure of the improved soil is damaged, the shear strength of the cement improved soil has a large loss, while the composite curing agent improved soil still maintains a high shear strength.

Key words: geotechnical engineering, cement, basalt fiber, peat soil improvement, static characteristic

CLC Number:

TU411

QU Juntong, LIU Guandong, ZHU Yunqiang, LIU Chao, ZHANG Xiang, CUI Maojun, ZHANG Jian, ZHAO Tao. Effects of Cement/Basalt Fiber Composite Curing Agents on Static Characteristics of Peat Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 66-75.

References

[1] 刘伟,赵福玉,杨文辉,等.安嵩线草海段泥炭质土的特征及性质[J].岩土工程学报,2013,35(s2):671-674.
LIU W, ZHAO F Y, YANG W H, et al. Features and properties of peaty soil in Caohai section of Anning-Sonming line[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(s2): 671-674 (in Chinese).
[2] 丁祖德,付江,李夕松,等.昆明泥炭质土的物理力学指标特征及相关性分析[J].公路工程,2018,43(4):86-91.
DING Z D, FU J, LI X S, et al. Properties of physical and mechanical indexes and correlation analysis of peaty soil in Kunming area[J]. Highway Engineering, 2018, 43(4): 86-91 (in Chinese).
[3] 韦康.云南大理地区路堤下泥炭土地基沉降计算方法研究[D].北京:北京交通大学,2020.
WEI K. Research on calculation method of peat soil foundation under embankment in Dali area of Yunnan[D]. Beijing: Beijing Jiaotong University, 2020 (in Chinese).
[4] FOX P J, EDIL T B, LAN L T. Calpha/Cc concept applied to compression of peat[J]. Journal of Geotechnical Engineering, 1992, 118(8): 1256-1263.
[5] KOLAY P K, AMINUR M R, TAIB S N L, et al. Correlation between different physical and engineering properties of tropical peat soils from Sarawak[C]//USA: American Society of Civil Engineers, 2010.
[6] 杨爱武,肖敏,周玉明.石灰粉煤灰固化天津滨海软土试验研究[J].地下空间与工程学报,2019,15(1):60-67.
YANG A W, XIAO M, ZHOU Y M. Experimental study on lime-fly ash to cure Tianjin marine soft soil[J]. Chinese Journal of Underground Space and Engineering, 2019, 15(1): 60-67 (in Chinese).
[7] 张致龙,张建明,张虎,等.离子类土壤固化剂对高温冻土工程性质改良试验研究[J].冰川冻土,2019,41(1):140-146.
ZHANG Z L, ZHANG J M, ZHANG H, et al. Experimental study of the engineering properties of warm frozen soil treated with ionic soil stabilizer (ISS)[J]. Journal of Glaciology and Geocryology, 2019, 41(1): 140-146 (in Chinese).
[8] 庄心善,庄涛,陶高粱,等.磷尾矿改良膨胀土动变形与动强度特性试验研究[J].岩石力学与工程学报,2020,39(s1):3032-3038.
ZHUANG X S, ZHUANG T, TAO G L, et al. Experimental study on dynamic deformation and dynamic strength of expansive soil modified by phosphorus tailings[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(s1): 3032-3038 (in Chinese).
[9] 耿轶君.EN-1土壤固化剂改良红砂岩的作用机理与路用性能研究[D].成都:西南交通大学,2009.
GENG Y J. Study on action mechanism and road performance of improved red sandstone by EN-1 soil agent[D]. Chengdu: Southwest Jiaotong University, 2009 (in Chinese).
[10] 潘湘辉,桂岚,李跃军.不同土壤固化剂对土质固化性能影响的对比试验研究[J].公路工程,2014,39(1):59-62.
PAN X H, GUI L, LI Y J. Contrast experiment study on the stabilized effect of the different soil stahilizer[J]. Highway Engineering, 2014, 39(1): 59-62 (in Chinese).
[11] 唐朝生,施斌,高玮.聚丙烯纤维和水泥对黏性土强度的影响及机理研究[J].工程地质学报,2007,15(1):108-113.
TANG C S, SHI B, GAO W. Effects of polypropylene fiber and cement additives on strength behavior of clay soil and the mechanisms[J]. Journal of Engineering Geology, 2007, 15(1): 108-113 (in Chinese).
[12] 吴刚,朱莹,董志强,等.碱性环境中BFRP筋耐腐蚀性能试验研究[J].土木工程学报,2014,47(8):32-41.
WU G, ZHU Y, DONG Z Q, et al. Experimental study on the corrosion resistance performance of BFRP bars in the alkaline environment[J]. China Civil Engineering Journal, 2014, 47(8): 32-41 (in Chinese).
[13] 李雪刚,徐日庆,畅帅,等.响应面法优化有机质软土复合固化剂配方[J].浙江大学学报(工学版),2014,48(5):843-849.
LI X G, XU R Q, CHANG S, et al. Application of response surface methodology on optimizing mixture ratio of composite curing agent used to improve organic matter soil stabilization[J]. Journal of Zhejiang University (Engineering Science), 2014, 48(5): 843-849 (in Chinese).
[14] 郭印.淤泥质土的固化及力学特性的研究[D].杭州:浙江大学,2007.
GUO Y. Study on stabilization of muddy soil and mechanical properties of stabilized soil[D]. Hangzhou: Zhejiang University, 2007 (in Chinese).
[15] 王旭. 浅层淤泥质土改良剂研究[D].杭州:浙江大学,2018.
WANG X. Study on improved organisms of shallow silty soil[D]. Hangzhou: Zhejiang University, 2018 (in Chinese).
[16] 朱剑锋,徐日庆,罗战友,等.考虑3种因素影响的硫氧镁水泥固化土修正邓肯-张模型[J].中南大学学报(自然科学版),2020,51(7):1989-2001.
ZHU J F, XU R Q, LUO Z Y, et al. Modified Duncan-Chang constitutive model for soft soil stabilized by magnesium oxysulfate cement considering three effect factors[J]. Journal of Central South University (Science and Technology), 2020, 51(7): 1989-2001 (in Chinese).
[17] 孟素云.降雨条件下边坡非饱和入渗模型及生态加固机理研究[D].北京:中国地质大学(北京),2019.
MENG S Y. Study on unsaturated infiltration model and ecological reinforcement mechanism of slope under rainfall condition[D]. Beijing: China University of Geosciences, 2019 (in Chinese).
[18] 中华人民共和国住房和城乡建设部.水泥土配合比设计规程:JGJ/T 233—2011[S].北京:中国建筑工业出版社,2011.
Ministry of Housing and Urban-Rural Development, PRC. Design regulation of soil-cement mix: JGJ/T 233—2011[S]. Beijing: China Architecture and Building Press, 2011 (in Chinese).
[19] 龚晓南.议土的抗剪强度影响因素[J].地基处理,1998(3):54-56.
GONG X N. Influencing factors of shear strength of soil[J].Ground Improvement, 1998(3): 54-56 (in Chinese).