文章摘要
马雯波,丁哲,吴智仁,梁止水,杨才千.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):22~28,34
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
投稿时间:2018-05-22  修订日期:2018-06-21
DOI:10.13961/j.cnki.stbctb.2018.06.004
中文关键词: 干湿循环  W-OH砒砂岩固结体  无侧限抗压强度  三轴抗压强度  微观结构分析
英文关键词: drying-wetting cycles  W-OH solidified Pisha sandstone  unconfined compressive strength  triaxial compressive strength  microstructure
基金项目: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)
作者单位E-mail
马雯波 湘潭大学 土木工程与力学学院, 湖南 湘潭 411105
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 
 
丁哲 湘潭大学 土木工程与力学学院, 湖南 湘潭 411105
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 
 
吴智仁 江苏大学 环境与安全工程学院, 江苏 镇江 212013  
梁止水 东南大学 土木工程学院, 江苏 南京, 210096  
杨才千 湘潭大学 土木工程与力学学院, 湖南 湘潭 411105
东南大学 土木工程学院, 江苏 南京, 210096 
ycqjxx@hotmail.com 
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中文摘要:
      [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。
英文摘要:
      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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