矿渣基地聚物流态盾构固化土的性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (6): 2176-2185.

矿渣基地聚物流态盾构固化土的性能研究

牛家栋¹, 杜运兴¹, 张自成², 李艳秋², 秦宝坤²

1.湖南大学土木工程学院,长沙 410082;
2.中建一局集团第五建筑有限公司,北京 100024

收稿日期:2023-11-22 修订日期:2024-01-16 出版日期:2024-06-15 发布日期:2024-06-18
通信作者: 杜运兴,博士,教授。E-mail:duyunxing@hnu.edu.cn
作者简介:牛家栋(1998—),男,硕士研究生。主要从事固化土的研究。E-mail:812405277@qq.com
基金资助:
长沙市科技计划重大专项(kq1804002)

Performance of Slag-Based Geopolymer Flow Shield-Cured Soil

NIU Jiadong¹, DU Yunxing¹, ZHANG Zicheng², LI Yanqiu², QIN Baokun²

1. College of Civil Engineering, Hunan University, Changsha 410082, China;
2. China Construction First Group the Fifth Construction Company, Beijing 100024, China

Received:2023-11-22 Revised:2024-01-16 Online:2024-06-15 Published:2024-06-18

摘要/Abstract

摘要： 为实现对地下工程中的高含水率盾构土资源化利用,探究地聚物材料固化盾构土的可行性,本文采用矿渣基地聚物固化盾构土,通过研究碱激发剂模数、矿物配比、碱激发剂掺量、温度对不同种类盾构固化土无侧限抗压强度和工程性能的影响规律,确定固化土配合比设计,在此基础之上研究地聚物掺量对固化土水稳性的影响,并采用SEM对盾构固化土进行微观分析,揭示其固化机制。结果表明,在试验拟定的水固比下,两种不同土质流态盾构固化土均有良好的力学性能和工程性能,矿渣基地聚物产生了无定形凝胶,增强了土壤颗粒之间的胶结及密实度,其中固化剂掺量为干土质量22%的盾构固化土在标养条件下的28 d无侧限抗压强度可达5.38 MPa,40 ℃条件下可达8.08 MPa,水稳系数达0.98。

关键词: 盾构固化土, 地聚物, 固化剂, 最优配合比, 工程性能, 微观机理

Abstract: In order to achieve the resource utilization of high moisture content shield soil in underground engineering and explore the feasibility of using geopolymer materials to solidify shield soil, this paper adopts slag-base geopolymer to solidify shield soil. By studying the influences of alkali activator modulus, mineral ratio, alkali activator dosage and temperature on unconfined compressive strength and engineering performance of different types of shield-cured soil, the design of cured soil mix proportion was determined. The influence of geopolymer content on water stability of cured soil was studied. Microscopic analysis of shield-cured soil using SEM to reveal the solidification mechanism. The results show that under the proposed water solid ratio in the test, the two kinds of fluid shield-cured soil with different soil properties have good mechanical and engineering properties. The aggregate of slag base produces amorphous gel, which enhances the cementation and compactness between soil particles. The unconfined compressive strength of shield-cured soil with 22% dry soil mass as cementing agent can reach 5.38 MPa in 28 d under standard curing, 8.08 MPa under 40 ℃ curing, and the water stability coefficient can reach 0.98.

Key words: shield-cured soil, geopolymer, cementing agent, optimal mix ratio, engineering performance, microscopic mechanism

中图分类号:

TU528

牛家栋, 杜运兴, 张自成, 李艳秋, 秦宝坤. 矿渣基地聚物流态盾构固化土的性能研究[J]. 硅酸盐通报, 2024, 43(6): 2176-2185.

NIU Jiadong, DU Yunxing, ZHANG Zicheng, LI Yanqiu, QIN Baokun. Performance of Slag-Based Geopolymer Flow Shield-Cured Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2176-2185.

参考文献

[1] LIN D, NELSON J D, BEECROFT M, et al. An overview of recent developments in China’s metro systems[J]. Tunnelling and Underground Space Technology, 2021, 111: 103783.
[2] BROERE W. Urban underground space: solving the problems of today’s cities[J]. Tunnelling and Underground Space Technology incorporating Trenchless Technology Research, 2016, 55: 245-248.
[3] ZHANG L, LONG R, CHEN H. Carbon emission reduction potential of urban rail transit in China based on electricity consumption structure[J]. Resources, Conservation and Recycling, 2019, 142: 113-121.
[4] GUO Q, WEI M L, WU H L, et al. Strength and micro-mechanism of MK-blended alkaline cement treated high plasticity clay[J]. Construction and Building Materials, 2020, 236: 117567.
[5] JIANG N, WANG C M, WANG Z P, et al. Strength characteristics and microstructure of cement stabilized soft soil admixed with silica fume[J]. Materials, 2021, 14(8): 1929.
[6] AHMED A. Compressive strength and microstructure of soft clay soil stabilized with recycled bassanite[J]. Applied Clay Science, 2015, 104: 27-35.
[7] PUPPALA A J, PEDARLA A. Innovative ground improvement techniques for expansive soils[J]. Innovative Infrastructure Solutions, 2017, 2(1): 24.
[8] PORBAHA A. State of the art in deep mixing technology: part I. Basic concepts and overview[J]. Proceedings of the Institution of Civil Engineers-Ground Improvement, 1998, 2(2): 81-92.
[9] AHMADI C H, HAMID L S, MOLAABASI H, et al. The effect of zeolite and cement stabilization on the mechanical behavior of expansive soils[J]. Construction and Building Materials, 2021, 272: 121630.
[10] LIU H M, WANG L M, GAO P. The mechanical properties of cement reinforced loess and pore microstructure characteristics[J]. Applied Mechanics and Materials, 2014, 527: 25-30.
[11] WU D Z, ZHANG Z L, CHEN K Y, et al. Experimental investigation and mechanism of fly ash/slag-based geopolymer-stabilized soft soil[J]. Applied Sciences, 2022, 12(15): 7438.
[12] 吴俊, 征西遥, 杨爱武, 等. 矿渣-粉煤灰基地质聚合物固化淤泥质黏土的抗压强度试验研究[J]. 岩土力学, 2021, 42(3): 647-655.
WU J, ZHENG X Y, YANG A W, et al. Experimental study on the compressive strength of muddy clay solidified by the one-part slag-fly ash based geopolymer[J]. Rock and Soil Mechanics, 2021, 42(3): 647-655 (in Chinese).
[13] 郝彤, 王帅, 冷发光. 利用地铁盾构渣土制备高流态充填材料[J]. 硅酸盐通报, 2020, 39(5): 1525-1532.
HAO T, WANG S, LENG F G. Preparation of high fluid filling materials by using subway shield muck[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(5): 1525-1532 (in Chinese).
[14] MOHANTY S, ROY N, SINGH S P, et al. Strength and durability of flyash, GGBS and cement clinker stabilized dispersive soil[J]. Cold Regions Science and Technology, 2021, 191: 103358.
[15] 俞家人, 陈永辉, 陈庚, 等. 地聚物固化软黏土的力学特征及机理分析[J]. 建筑材料学报, 2020, 23(2): 364-371.
YU J R, CHEN Y H, CHEN G, et al. Mechanical behaviour of geopolymer stabilized clay and its mechanism[J]. Journal of Building Materials, 2020, 23(2): 364-371 (in Chinese).
[16] ZHANG M, ZHAO M X, ZHANG G P, et al. Calcium-free geopolymer as a stabilizer for sulfate-rich soils[J]. Applied Clay Science, 2015, 108: 199-207.
[17] SINGHI B, LASKAR A I, ALI A M. Investigation on soil-geopolymer with slag, fly ash and their blending[J]. Arabian Journal for Science and Engineering, 2016, 41(2): 393-400.
[18] 杨振甲, 何猛, 吴杨, 等. 矿渣-粉煤灰地聚物固化淤泥力学性能和路用性能研究[J]. 硅酸盐通报, 2022, 41(2): 693-703+724.
YANG Z J, HE M, WU Y, et al. Mechanical properties and road performance of slag-fly ash geopolymer stabilized sludge[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(2): 693-703+724 (in Chinese).
[19] ABDULLAH H H, SHAHIN M A, WALSKE M L. Geo-mechanical behavior of clay soils stabilized at ambient temperature with fly-ash geopolymer-incorporated granulated slag[J]. Soils and Foundations, 2019, 59(6): 1906-1920.
[20] CONG P L, CHENG Y Q. Advances in geopolymer materials: a comprehensive review[J]. Journal of Traffic and Transportation Engineering (English Edition), 2021, 8(3): 283-314.
[21] ARULRAJAH A, YAGHOUBI M, DISFANI M M, et al. Evaluation of fly ash- and slag-based geopolymers for the improvement of a soft marine clay by deep soil mixing[J]. Soils and Foundations, 2018, 58(6): 1358-1370.
[22] CRISTELO N, GLENDINNING S, FERNANDES L, et al. Effect of calcium content on soil stabilisation with alkaline activation[J]. Construction and Building Materials, 2012, 29: 167-174.
[23] POURABBAS B M, TOUFIGH M M, TOUFIGH V. Experimental investigation of using a recycled glass powder-based geopolymer to improve the mechanical behavior of clay soils[J]. Construction and Building Materials, 2018, 170: 302-313.
[24] YIP C K, LUKEY G C, VAN-DEVENTER J S J. The coexistence of geopolymeric gel and calcium silicate hydrate at the early stage of alkaline activation[J]. Cement and Concrete Research, 2005, 35(9): 1688-1697.
[25] GHADIR P, RANJBAR N. Clayey soil stabilization using geopolymer and Portland cement[J]. Construction and Building Materials, 2018, 188: 361-371.