W-OH砒砂岩固结体干湿循环特性及其细观机理

马雯波; 丁哲; 吴智仁; 梁止水; 杨才千

doi:10.13961/j.cnki.stbctb.2018.06.004

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W-OH砒砂岩固结体干湿循环特性及其细观机理

试验研究

- W-OH砒砂岩固结体干湿循环特性及其细观机理
- Mechanical Properties and Meso-mechanism of Pisha Sandstone with W-OH Solidified Under Drying-wetting Cycles
- 水土保持通报 2018年38卷第6期页码：22-28
- 作者机构：
  
  1. 湘潭大学土木工程与力学学院,湖南,湘潭,411105
  2. 湘潭大学湖南岩土力学与工程安全重点实验室,湖南,湘潭,411105
  3. 江苏大学环境与安全工程学院,江苏,镇江,212013
  4. 东南大学土木工程学院,江苏,南京,210096
- 作者简介：
- 基金信息：
  
  国家重点研发计划项目“砒砂岩区生态安全保障技术”（2017YFC0504505）;国家自然科学基金项目（11502226）;湖南省重点研发项目（2017WK2032）
- DOI：10.13961/j.cnki.stbctb.2018.06.004
  中图分类号：
- 纸质出版：2018
- 稿件说明：
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马雯波, 丁哲, 吴智仁, 等. W-OH砒砂岩固结体干湿循环特性及其细观机理[J]. 水土保持通报, 2018,38(6):22-28.

MA Wenbo, DING Zhe, WU Zhiren, et al. Mechanical Properties and Meso-mechanism of Pisha Sandstone with W-OH Solidified Under Drying-wetting Cycles[J]. Bulletin of Soiland Water Conservation, 2018, 38(6): 22-28.
马雯波, 丁哲, 吴智仁, 等. W-OH砒砂岩固结体干湿循环特性及其细观机理[J]. 水土保持通报, 2018,38(6):22-28. DOI： 10.13961/j.cnki.stbctb.2018.06.004.

MA Wenbo, DING Zhe, WU Zhiren, et al. Mechanical Properties and Meso-mechanism of Pisha Sandstone with W-OH Solidified Under Drying-wetting Cycles[J]. Bulletin of Soiland Water Conservation, 2018, 38(6): 22-28. DOI： 10.13961/j.cnki.stbctb.2018.06.004.

摘要

[目的] 对W-OH砒砂岩固结体干湿循环特性及其细观机理进行研究，为实现W-OH固结改良砒砂岩及其耐久性研究提供科学依据。[方法] 采用W-OH（亲水性聚氨酯材料）对砒砂岩进行固结处理，基于无侧限抗压试验、三轴抗压试验，研究其在干湿循环条件下的力学性能，并结合SEM，EDS和称重法对其干湿循环后样品微观结构、元素和质量损失进行分析，以获得其破坏机理。[结果] W-OH砒砂岩固结体的无侧限抗压强度、弹性模量和黏聚力在1~3次干湿循环后升高；在3~9次干湿循环后，固结体的力学强度降低；9次之后，剩下高黏结力的W-OH胶结体包裹于砒砂岩颗粒表面，力学强度趋于稳定。内摩擦角在1~9次干湿循环后上下波动，9次干湿循环后趋于稳定。采用碳元素分析和质量损失分析相结合的方法对土样中W-OH流失特性进行评价，发现土样在1~9次干湿循环中W-OH胶结体逐渐降低，并在9次干湿循环后达到稳定，这与上述宏观力学变化的规律相似，验证了破坏机理，为判断其长期特性提供理论依据。[结论] 研究表明可将9次干湿循环后达到稳定的W-OH砒砂岩固结体的力学性质作为土体的长期力学特性。

Abstract

The effects of drying-wetting cycles on the mechanical properties and meso-mechanism of the hydrophilic polyurethane material(W-OH) solidified Pisha sandstone were conducted to provide scientific basis for the study of W-OH consolidation amending Pisha sandstone and its durability. W-OH was used to consolidate the Pisha sandstone in this study. Macroscopic mechanical properties of the W-OH solidified Pisha sandstone were tested by unconfined compression experiment and triaxial compression experiment. To obtain the meso-mechanism

SEM

EDS and weighing methods were used to analyze the microstructure

elements

and quality losses of the sample after drying-wetting cycles. The results showed that unconfined compressive strength

elastic modulus

and cohesion of the W-OH solidified Pisha sandstone increased after drying-wetting cycles of 1~3 times. During drying-wetting cycles of 3~9 times

the mechanical strength of the W-OH solidified Pisha sandstone decreased. the rest solidified W-OH with high cohesive forces remained on the surface of the Pisha sandstone particles and the mechanical strength tended to be stable after drying-wetting cycles 9 times. The internal friction angle varied with fluctuation from 1 to 9 time drying-wetting cycles and stabilized after 9 times. The W-OH loss in the solidified soil samples was evaluated by the carbon element analysis and mass loss analysis. The solidified W-OH gradually decreased during drying-wetting cycles of 1~9 times and became stable after 9 times

which proved meso-mechanism of macroscopic mechanical properties above-mentioned and provided theoretical basis for long-term characteristics of W-OH consolidated Pisha sandstone. The results of this study suggest that the mechanical properties of W-OH solidified Pisha sandstone after 9 drying-wetting cycles can be considered as the long-term mechanical properties of this material.

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references

石迎春,叶浩,侯宏冰,等.内蒙古南部砒砂岩侵蚀内因分析[J].地球学报,2004,25(6):659-664.

Zhao G, Mu X, Wen Z, et al. Soil erosion, conservation, and eco-environment changes in the loess platean of China[J]. Land Degradation & Development, 2013,24(5):499-510.

Guo Jiao, Shi Yingchun, Wu Lijie. Gravity erosion and lithology in Pisha sandstone in southern Inner Mongolia[J]. Journal of Ground water Science and Engineering, 2015,3(1):45-58.

肖培青,姚文艺,刘慧.砒砂岩地区水土流失研究进展与治理途径[J].人民黄河,2014,36(10):92-94.

王愿昌,吴永红,寇权,等.砒砂岩分布范围界定与类型区划分[J].中国水土保持科学,2007,5(1):14-18.

拾兵,曹叔尤.沟道植物坝的水土保持功效[J].土壤侵蚀与水土保持学报,1999,5(6):15-20.

毕慈芬,李桂芬.砒砂岩地区沟道沙棘植物"柔性坝"原型拦沙研究[J].国际沙棘研究与开发,2003,1(1):6-12.

Yang Fangshe, Cao Mingming, Li Huaien E. Simulation of sediment retention effects of the single seabuckthorn flexible dam in the Pisha sandstone area[J]. Ecological Engineering, 2013,52(3):228-237.

韩霁昌,刘彦随,罗林涛.毛乌素沙地砒砂岩与沙快速复配成土核心技术研究[J].中国土地科学,2012,26(8):87-94.

Ahmed A, Keizo U. Environmental effects on durability of soil stabilized with recycled gypsum[J]. Cold Regions Science and Technology, 2010,66(2):84-92.

王天,翁兴中,张俊,等. 干湿循环条件下复合固化砂土抗压强度试验研究[J].铁道科学与工程学报, 2017,14(4):721-729.

Kampala A, Horpibulsuk S, Prongmanee N. Influence of wet-dry cycles on compressive strength of calcium carbide residue-fly ash stabilized clay[J]. Journal of Materials in Civil Engineering, 2014,26(4):633-643.

Aldaood A, Bouasker M, Al-Mukhtar M. Impact of wetting-drying cycles on the microstructure and mechanical properties of lime-stabilized gypseous soils[J]. Engineering Geology, 2014,174(1):11-21.

郑军,阎长虹,夏文俊,等.干湿循环对新型固化土承载强度影响的试验研究[J].岩石力学与工程学报,2009,28(S1):3051-3056.

程佳明,王银梅,苗世超,等.固化黄土的干湿循环特性研究[J].工程地质学报,2014,22(2):226-232.

苏涛,张兴昌.EN-1对砒砂岩固化土坡面径流水动力学特征的影响[J].农业机械学报,2011,42(11):68-75.

梁止水,吴智仁,杨才千,等.基于W-OH的砒砂岩抗蚀促生机理研究[J].水利学报,2016,47(9):1160-1166.

梁止水,吴智仁,杨才千,等.砒砂岩固结体防水抗蚀及紫外耐久性能研究[J].人民黄河,2016,38(6):46-48.

梁止水,杨才千,吴智仁.W-OH与砒砂岩固结体力学性能研究[J].人民黄河,2016,38(6):30-34.

Goh G S, Rahardjo H, Choon L E. Shear strength equations for unsaturated soil under drying and wetting[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010,136(4):594-606.

American Society for Testing and Materials. Standard Test Methods for Wetting and Drying Compacted Soil-Cement Mixtures[M].West Conshohocken:ASTM, USA, ASTMD, 2004:559-03.

杨同,徐川,王宝学,等. 岩土三轴试验中的黏聚力与内摩擦角[J].中国矿业,2007,16(12):104-107.

何利军,孔令伟.土的应力-应变关系的一种描述模式[J].工程地质学报, 2010,18(6):900-905.

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