水泥-磷石膏改良泥炭质土动力特性研究

摘要/Abstract

摘要： 为了研究水泥-磷石膏的综合改良对昆明滇池地区泥炭质土动力特性的影响效果,基于前期已有的室内试验成果,对掺入不同含量水泥和磷石膏的改良泥炭质土进行室内动三轴试验,重点研究了其动力响应和强度特性在不同围压、加载频率、掺量、固结比、动应力幅值条件下所受的影响,分析了N=6振级下的滞回曲线变化规律以及XRD测试结果。研究表明,经改良后的泥炭质土动力特性有极大的变化。在仅掺入水泥作为主改良剂的基础上,刚度和弹性得到一些提升。之后加入磷石膏作为外加剂,二者综合作用下的提升效果更加明显,抗变形能力显著提升,土体能量消散能力降低,滞回曲线有明显向纵坐标轴偏转的趋势。由此说明相较于水泥的单一作用,水泥-磷石膏的复合作用对改良泥炭质土的土体刚度和弹性有着更加显著的提升作用,极大地提升了抗震性能,改良后的泥炭质土可以更好地应用于相关的实际工程。

关键词: 泥炭质土, 水泥-磷石膏, 固化剂, 动力特性, 滞回曲线

Abstract: In order to study the effect of cement-phosphogypsum comprehensive improvement on the dynamic characteristics of peaty soil in Dianchi area of Kunming, the laboratory dynamic triaxial test of improved peaty soil with different content of cement and phosphogypsum was carried out based on the previous laboratory test results. The effects of dynamic response and strength characteristics under different confining pressures, loading frequencies, dosages, consolidation ratios and dynamic stress amplitudes were mainly studied. The hysteresis curve change law at N=6 vibration level and the results of XRD test were analyzed. The results show that the dynamic characteristics of improved peaty soil change greatly. On the basis of separately adding cement as the main modifier, the stiffness and elasticity have been slightly improved. After adding phosphogypsum as an admixture, the combined effect is more obvious, the deformation resistance is improved significantly, the energy dissipation ability of soil is reduced, and the hysteresis curve has an obvious tendency to deflect to the longitudinal axis, which indicates that compared to the single action of cement, the composite action of cement-phosphogypsum has a more significant improvement effect on the soil stiffness and elasticity of the improved peaty soil, greatly improving the seismic performance. The improved peaty soil can be better applied to relevant practical engineering.

Key words: peaty soil, cement-phosphogypsum, curing agent, dynamic characteristic, hysteretic curve

中图分类号:

TU411

屈俊童, 栾凯钰, 浦钧翔, 王文彬, 龙宁波. 水泥-磷石膏改良泥炭质土动力特性研究[J]. 硅酸盐通报, 2023, 42(12): 4427-4437.

QU Juntong, LUAN Kaiyu, PU Junxiang, WANG Wenbin, LONG Ningbo. Dynamic Characteristics of Cement-Phosphogypsum Improving Peaty Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4427-4437.

参考文献

[1] 李琳, 曹广祝, 朱赛楠. 昆明滇池泥炭土力学性质改良试验[J]. 科学技术与工程, 2012, 12(11): 2768-2771.
LI L, CAO G Z, ZHU S N. Experiment on improving mechanical character of Dianchi peat soil in Kunming[J]. Science Technology and Engineering, 2012, 12(11): 2768-2771 (in Chinese).
[2] 季东. 有机质含量对云南昆明泥炭质土静动三轴强度的影响研究[D]. 昆明: 云南大学, 2020.
JI D. Study on the influence of organic matter content on static and dynamic triaxial strength of peat soil in Kunming, Yunnan[D]. Kunming: Yunnan University, 2020 (in Chinese).
[3] 刘敏. 昆明泥炭及泥炭质软土的工程特性研究[J]. 城市道桥与防洪, 2017(9): 207-208+21.
LIU M. Study on engineering characteristics of peat and peaty soft soil in Kunming[J]. Urban Roads Bridges & Flood Control, 2017(9): 207-208+21 (in Chinese).
[4] 黄娟, 丁祖德, 袁铁映, 等. 循环荷载作用下泥炭质土的动变形特性试验研究[J]. 岩土力学, 2017, 38(9): 2551-2558.
HUANG J, DING Z D, YUAN T Y, et al. Experimental study of dynamic deformation properties of peaty soil under cyclic loading[J]. Rock and Soil Mechanics, 2017, 38(9): 2551-2558 (in Chinese).
[5] 杨冰. 滇池湖相软土化学改良与力学参数统计推断[D]. 昆明: 昆明理工大学, 2022.
YANG B. Chemical improvement and statistical inference of mechanical parameters of soft soil in Dianchi Lake[D]. Kunming: Kunming University of Science and Technology, 2022 (in Chinese).
[6] 谢宝琎, 王春明, 张向东. 水泥加固处理泥炭土性能的试验研究[J]. 路基工程, 2014(4): 129-132+136.
XIE B J, WANG C M, ZHANG X D. Experimental study on treatment of peat soil performance by cement reinforcement[J]. Subgrade Engineering, 2014(4): 129-132+136 (in Chinese).
[7] WONG L S, HASHIM R, ALI F. Utilization of sodium bentonite to maximize the filler and pozzolanic effects of stabilized peat[J]. Engineering Geology, 2013, 152(1): 56-66.
[8] 蒋卓吟, 李琴. 固化滇池泥炭土抗压强度的实验研究[J]. 硅酸盐通报, 2018, 37(10): 3193-3196+3205.
JIANG Z Y, LI Q. Experimental research on the strength of the peat soil solidified of the Dianchi Lake[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(10): 3193-3196+3205 (in Chinese).
[9] 张文豪, 谢建斌, 刘道炎, 等. 水泥-高钙粉煤灰改良泥炭质土力学性能研究[J]. 河南理工大学学报(自然科学版), 2020, 39(5): 161-167.
ZHANG W H, XIE J B, LIU D Y, et al. Study on mechanical properties of peat soil improved by cement and high calcium fly ash[J]. Journal of Henan Polytechnic University (Natural Science), 2020, 39(5): 161-167 (in Chinese).
[10] 朱云强, 屈俊童, 刘超, 等. 水泥-玄武岩纤维改良泥炭质土滞回曲线变化规律研究[J]. 公路, 2022, 67(8): 346-352.
ZHU Y Q, QU J T, LIU C, et al. Research on the hysteretic curve change law of cement-basalt fiber-improved peaty soil[J]. Highway, 2022, 67(8): 346-352 (in Chinese).
[11] 商拥辉, 徐林荣. 重载铁路水泥改良土路基动力特性试验研究[J]. 振动工程学报, 2021, 34(6): 1276-1283.
SHANG Y H, XU L R. Field vibration test research on dynamic features of cement-stabilized expansive soil subgrade of heavy haul railway[J]. Journal of Vibration Engineering, 2021, 34(6): 1276-1283 (in Chinese).
[12] 段俊彪. 水泥及石灰改良土填料动力特性试验分析[J]. 铁道勘察, 2006, 32(4): 39-41.
DUAN J B. Experimental analysis on dynamics characteristics of cement and lime improved soil refillings[J]. Railway Investigation and Surveying, 2006, 32(4): 39-41 (in Chinese).
[13] 段自侠. 云南大理洱海地域典型高原湖相泥炭质土动力特性试验研究分析[D]. 昆明: 云南大学, 2019.
DUAN Z X. Experimental study and analysis on dynamic characteristics of typical plateau lacustrine peat soil in Erhai Lake area of Dali, Yunnan Province[D]. Kunming: Yunnan University, 2019 (in Chinese).
[14] 中华人民共和国住房和城乡建设部. 土工试验方法标准: GB/T 50123—2019[S]. 北京: 中国计划出版社, 2019.
Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Standard for geotechnical testing method: GB/T 50123—2019[S]. Beijing: China Planning Press, 2019 (in Chinese).
[15] 国家质量监督检验检疫总局. 石膏化学分析方法: GB/T 5484—2012[S]. 北京: 中国标准出版社, 2013.
General Administration of Quality Supervision, Inspection and Quarantine. Methods for chemical analysis of gypsum: GB/T 5484—2012[S]. Beijing: Standards Press of China, 2013 (in Chinese).
[16] 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 of the People’s Republic of China. Specification for mix proportion design of cement soil: JGJ/T 233—2011[S]. Beijing: China Architecture & Building Press, 2011 (in Chinese).
[17] 黄窈婷. 高水位低路堤饱和粉砂土路基动三轴试验研究[D]. 南宁: 广西大学, 2017.
HUANG Y T. Study on dynamic triaxial test of saturated silty sand subgrade with high water level and low embankment[D]. Nanning: Guangxi University, 2017 (in Chinese).
[18] 南京水利科学研究院. 土工试验规程: SL/T 237—1999[S]. 北京: 中国水利水电出版社, 1999.
Nanjing Hydraulic Research Institute. Code of geotechnical tests: SL/T 237—1999[S]. Beijing: China Water Power Press, 1999 (in Chinese).