Mixture Ratio Design and Application of Chemically Improved Lake Peat Soil

Abstract

Abstract: In order to meet the needs of the project, the lake peat soil was improved by chemical reinforcement. For the lake peat soil in 3 sites, 11 kinds of additives such as water reducing agent, early strength agent, auxiliary cementing material were added, 23 kinds of ratio improvement schemes were formulated, and the indoor unconfined compressive strength and light cone dynamic penetration test were adopted. Then the best ratio of the chemical curing agent was obtained. The experimental results show that the compressive strength of the soil mixed with the modifier is larger than that of the original soil, and it increases with the increase of the age. The best ratio and content (mass fraction) are 25% cement, 6% quicklime, and 1% fly ash, and the water-cement ratio is 1:1.

Key words: lake peat soil, chemical curing agent, optimum mixing ratio, light cone dynamic penetration, unconfined compressive strength

CLC Number:

TU411

RUAN Yongfen, YANG Bing, WU Long, LIU Kewen, ZHU Qiang. Mixture Ratio Design and Application of Chemically Improved Lake Peat Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2240-2247.

References

[1] 阮永芬,魏德永,高骏,等.K-means聚类分析高原湖相沉积软土参数[J].昆明理工大学学报(自然科学版),2020,45(1):85-91.
RUAN Y F, WEI D Y, GAO J, et al. K-means cluster analysis of soft soil parameters of plateau sedimentary[J]. Journal of Kunming University of Science and Technology (Natural Science), 2020, 45(1): 85-91 (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] 余再西,曹净,高松.红粘土置换式水泥土桩强度特性试验研究[J].硅酸盐通报,2013,32(11):2319-2324.
YU R X, CAO J, GAO S. Experimental study on the strength characteristics of red clay replacement cement-soil piles[J]. Bulletin of the Chinese Ceramic Society, 2013, 32(11): 2319-2324 (in Chinese).
[4] 张帆,李向红,孙伟,等.深层搅拌桩加固昆明泥炭质土的试验研究[J].建筑施工,2020,42(6):1069-1071.
ZHANG F, LI X H, SUN W, et al. Experimental study on reinforcement of Kunming peat soil by deep mixing pile[J]. Building Construction, 2020, 42(6): 1069-1071 (in Chinese).
[5] 谈云志,吴军,黄龙波,等.冻融作用下水泥改良软黏土的性能演化过程[J].建筑材料学报,2017,20(2):209-214.
TAN Y Z, WU J, HUANG L B, et al. Performance evolution of cement improved soft clay under freeze-thaw cycles[J]. Journal of Building Materials, 2017, 20(2): 209-214 (in Chinese).
[6] 倪涛,裴向军,范明明,等.SJP水泥改良土浆的基本物理性能试验研究[J].硅酸盐通报,2019,38(8):2637-2641.
NI T, PEI X J, FAN M M, et al. Experimental study on basic physical properties of SJP cement improved soil slurry[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(8): 2637-2641 (in Chinese).
[7] 杨成,赵柯,刘德仁,等.水泥改良弱胶结砂岩填料的性能研究[J].硅酸盐通报,2018,37(2):630-634.
YANG C, ZHAO K, LIU D R, et al. Study on properties of cement modified weak cemented sandstone filling material[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(2): 630-634 (in Chinese).
[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] 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).
[10] 桂跃,吴承坤,刘颖伸,等.利用微生物技术改良泥炭土工程性质试验研究[J].岩土工程学报,2020,42(2):269-278.
GUI Y, WU C K, LIU Y S, et al. Improving engineering properties of peaty soil by biogeotechnology[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(2): 269-278 (in Chinese).
[11] 文雯,虎雄林,毛先进,等.昆明盆地泥炭质土动力学参数统计研究[J].地震研究,2020,43(1):176-184.
WEN W, HU X L, MAO X J, et al. Statistical analysis on dynamic parameters of peaty soil in the Kunming basin[J]. Journal of Seismological Research, 2020, 43(1): 176-184 (in Chinese).
[12] 张文豪,谢建斌,刘道炎,等.水泥-高钙粉煤灰改良泥炭质土的宏细观试验研究[J].辽宁工程技术大学学报(自然科学版),2020,39(1):41-50.
ZHANG W H, XIE J B, LIU D Y, et al. Macroscopical and mesoscopic study on improving peaty soil with cement-high calcium fly ash[J]. Journal of Liaoning Technical University (Natural Science), 2020, 39(1): 41-50 (in Chinese).
[13] 陈慧娥.有机质影响水泥加固软土效果的研究[D].长春:吉林大学,2006.
CHEN H E. A study on the behavior of organic matter in the progress of solidifying soft soil by cement[D]. Changchun: Jilin University, 2006 (in Chinese).
[14] 吕小娟,何振.深层水泥搅拌桩的加固机理及设计实例[J].大众科技,2009,11(2):80-81.
LV X J, HE Z. Reinforcement mechanism and design example of deep cement mixing pile[J]. Popular Science & Technology, 2009, 11(2): 80-81 (in Chinese).
[15] LONG M. Review of peat strength, peat characterization and constitutive modelling of peat with reference to landslides[J]. Stadia Geotechnical et Mechanica, 2005, 27(3): 67-90.
[16] 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).
[17] 俞良晨,闫超,郭书兰,等.有机质含量对磷酸镁水泥固化土性质的影响研究[J].工程地质学报,2020,28(2):335-343.
YU L C, YAN C, GUO S L, et al. Study on the effect of organic content on properties of magnesium phosphate cement solidified soil[J]. Journal of Engineering Geology, 2020, 28(2): 335-343 (in Chinese).
[18] 张树彬.土体中腐殖酸对水泥固化软土效果的影响[D].长春:吉林大学,2007.
ZHANG S B. The infection on the humic acid in the progress of solidifying soft soil by cement soil[D]. Changchun: Jilin University, 2007 (in Chinese).
[19] 张艳荣.水泥-化学外加剂-水分散体系早期微结构与流变性[D].北京:清华大学,2014.
ZHANG Y R. Study on the microstructure and rheological properties of cement-chemical admixtures-water dispersion system at early stage[D]. Beijing: Tsinghua University, 2014 (in Chinese).
[20] 邵玉芳,何超,楼庆庆.西湖疏浚淤泥的固化试验[J].江苏大学学报(自然科学版),2007,28(5):442-445.
SHAO Y F, HE C, LOU Q Q. Stabilization of dredged silt from West Lake[J]. Journal of Jiangsu University (Natural Science Edition), 2007, 28(5): 442-445 (in Chinese).
[21] 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]//GeoShanghai International Conference, Shanghai, 2010: 56-61.
[22] 陈琴,万惠文,谢春磊,等.含早强剂的矿物掺合料在水泥体系中的作用机理研究[J].混凝土,2010(9):55-56+59.
CHEN Q, WAN H W, XIE C L, et al. Fictitious crack model for protective maximum expansion force of reinforced concrete structure due to rebar corrosion[J]. Concrete, 2010(9): 55-56+59 (in Chinese).
[23] 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).
[24] 杨志强,郭见扬.石灰处理土的物理力学性质及其微观机理的研究[J].岩土力学,1991,12(3):11-23.
YANG Z Q, GUO J Y. The physio-mechanical properties and micro-mechanism in lime-soil system[J]. Rock and Soil Mechanics, 1991, 12(3): 11-23 (in Chinese).
[25] MODMOLTIN C,陆江,ONITSUKA K.腐殖酸与盐分浓度对石灰加固土有明黏土的影响以及微观结构研究[J].岩土工程学报,2004,26(2):281-286.
MODMOLTIN C, LU J, ONITSUKA K. Influence of humic acid and salt concentration on lime-stabilized ariake clays and microstructure research[J]. Chinese Journal of Geotechnical Engineering, 2004, 26(2): 281-286 (in Chinese).