| 张洪东,李海峰,李贺勇,刘瑾,胡恬静,张化鹏,赵宁宁.棕榈纤维加筋土强度特性试验研究[J].矿产勘查,2021,12(5):1264-1271 |
| 棕榈纤维加筋土强度特性试验研究 |
| Experimental study on the strength characteristics of soil reinforced by palm fiber |
| 投稿时间：2020-08-16 |
| DOI： |
| 中文关键词: 地质灾害 棕榈纤维 加筋率 干密度 无侧限抗压强度 抗剪强度 |
| 英文关键词: geological hazard palm ber ber content density uncon ned compression strength direct shear test |
| 基金项目:本文受国家自然科学基金面上项目中央高校基本科研业务费(B200202013)资助。 |
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| 中文摘要: |
| 通过无侧限抗压与直接剪切试验，研究了不同干密度与加筋率对棕榈纤维加筋土强度特性的影响。试验过程中，设置干密度为 1 55 g/cm3、 1 6 g/cm3、 1 65 g/cm3，加筋率为 0、 0 2%、 0 4%、 0 6%，在最优含水率下进行正交试验，并对其加固机理进行分析。结果表明:棕榈纤维可有效提高试样的无侧限抗压强度和抗剪强度。在含水率和干密度一定时，加筋黏土的抗压强度与抗剪强度随加筋率增大而增大；当加筋率超过最优加筋率 0 4%时，试样的无侧限抗压强度反而随纤维含量的增加而降低。棕榈纤维与土颗粒通过摩擦力与黏聚力结合，在适宜加筋率下，纤维相互交织形成空间网状结构，增加了试样强度。随着加筋率持续增大，纤维在试样内部交织成团，纤维与土颗粒有效接触点降低，破坏了试样完整性，削弱了加筋效果。研究结果为棕榈纤维加固土体的理论研究与工程实践提供参考依据，以期减少土岩边坡滑坡、泥石流等地质灾害的发生。 |
| 英文摘要: |
| The effects of different dry densities and different levels of fiber content on the strength characteristics of soil reinforced by palm fiber were studied by unconfined compressive and direct shear tests During the tests,the dry density was set at 1 55 g/cm3 ,1 6 g/cm3 ,1 65 g/cm3 respectively,and the ber content was set at 0,0 2%,0 4% and 0 6% accordingly Orthogonal tests were carried out under the optimal moisture content, and the reinforcement mechanisms were analyzed The results show that the unconfined compression strength and shear strength can be improved e ectively by adding certain palm ber When the moisture content and dry density are constant,the compressive strength and shear strength of the reinforced clay will increase with the increasing of the ber content When the ber content exceeds 0 4%,the uncon ned compressive strength of the sample will decrease with the increasing of ber content The palm ber and soil particles were combined by friction and cohesion,the bers will interweave to form a spatial network structure at the suitable ber content to increase the strength of samples As the ber content continues to increase,the bers will interweave into clusters within the sample,the e ective contact points between the bers and soil particles will decreases,the integrity of the sample will be destroy and the reinforcement effect will be weaken These study results will provide a reference for the theoretical research and engineering practice of palm ber reinforced soil in order to reduce the occurrence of geological hazards such as soil-rock slope,landslide and debris ow |
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