陈志昊, 刘瑾, 钱卫, 汪勇, 孙少锐, 冯嘉馨, 李鼎, 修于清. 2019: 高分子固化剂/纤维改良砂土的抗拉强度试验研究. 工程地质学报, 27(2): 350-359. DOI: 10.13544/j.cnki.jeg.2018-017
    引用本文: 陈志昊, 刘瑾, 钱卫, 汪勇, 孙少锐, 冯嘉馨, 李鼎, 修于清. 2019: 高分子固化剂/纤维改良砂土的抗拉强度试验研究. 工程地质学报, 27(2): 350-359. DOI: 10.13544/j.cnki.jeg.2018-017
    CHEN Zhihao, LIU Jin, QIAN Wei, WANG Yong, SUN Shaorui, FENG Jiaxin, LI Ding, XIU Yuqing. 2019: EXPERIMENTAL STUDY ON TENSILE STRENGTH OF POLYMER CURING AGENT/FIBER MODIFIED SAND. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 350-359. DOI: 10.13544/j.cnki.jeg.2018-017
    Citation: CHEN Zhihao, LIU Jin, QIAN Wei, WANG Yong, SUN Shaorui, FENG Jiaxin, LI Ding, XIU Yuqing. 2019: EXPERIMENTAL STUDY ON TENSILE STRENGTH OF POLYMER CURING AGENT/FIBER MODIFIED SAND. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 350-359. DOI: 10.13544/j.cnki.jeg.2018-017

    高分子固化剂/纤维改良砂土的抗拉强度试验研究

    EXPERIMENTAL STUDY ON TENSILE STRENGTH OF POLYMER CURING AGENT/FIBER MODIFIED SAND

    • 摘要: 本文采用高分子固化剂和聚丙烯纤维对砂土进行复合加固,通过对不同聚丙烯纤维含量、固化剂含量和干密度的重塑试样进行抗拉试验,测量试样破坏时的最大拉应力,对比不同试样抗拉强度的变化规律,并结合扫描电镜对复合加固机理进行较为深入的分析。试验结果表明,高分子固化剂和聚丙烯纤维的复合加固能够显著提高砂土的抗拉强度,纤维含量、固化剂含量和干密度对改良砂土的抗拉强度均具有较大的影响。当干密度和高分子固化剂含量一定时,砂土抗拉强度随纤维含量的增加逐渐增加,当固化剂含量为4%,干密度为1.5 g·cm-3时,纤维含量从0.2%到0.8%,抗拉强度从79.06 kPa增加到194.51 kPa;当干密度和纤维含量一定时,砂土抗拉强度随着高分子固化剂含量的增加而增加,当纤维含量为0.8%,干密度为1.5g·cm-3时,固化剂含量从1%到4%,抗拉强度从63.16 kPa增加到194.51 kPa;当高分子固化剂含量和纤维含量一定时,抗拉强度随着干密度的增加先增加后减小,在干密度为1.55 g·cm-3左右达到峰值。复合加固结合物理和化学加固的优点,通过纤维在颗粒间的相互作用力和固化剂在颗粒间的联结力,从而提高改良砂土的抗拉性能。本研究结果为进一步研究砂土复合加固及其工程应用提供一定的参考依据。

       

      Abstract: In this paper, the polymer curing agent and polypropylene fiber are used to reinforce sand in compound. The pull-out test is carried out on the remolded samples with different polypropylene fiber contents, curing agent contents and dry density to measure its tensile strength. The study compares the change regulation of tensile strength of sand before and after improvement, then analyzes its mechanism of composite reinforcement with scanning electron microscope(SEM). The experimental results show that the composite reinforcement of polymer curing agent and polypropylene fiber can significantly improve the tensile strength of sand. Fiber content, curing agent content and dry density have great influences on the tensile strength of modified sand. For specimens with the same dry density and polymer curing agent content, the tensile strength gradually increases with the increase of fiber content. For the specimens with 4% curing agent content and 1.5 g·cm-3 dry density, as fiber content increases from 0.2% to 0.8%, the tensile strength increases from 79.06 kPa to 194.51 kPa. For the specimens with the same dry density and fiber content, the tensile strength increases as polymer curing agent content increasing. For the specimens with 0.8% fiber content and 1.5 g·cm-3 dry density, the tensile strength increases from 63.16 kPa to 194.51 kPa as polymer curing agent content increases from 1% to 4%. As the dry density increase, the tensile strength first increases and then decreases with the peak at approximately1.55 g·cm-3. Composite reinforcement has the advantages of physical and chemical reinforcement. Through the interaction force among fibers and sand particles and the bonding force of polymer among sand particles, tensile strength of the modified sand is greatly improved. The results of this study also provide some references for further research on composite reinforcement of sand soil and its engineering application.

       

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