| Author Name | Affiliation | | Lixia Wang | School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130119, China | | Zilin Hu | School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130119, China | | Qing Wang | School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130119, China | | Yunlong Zhang | School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130119, China |
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| Abstract: |
| This study tested the electrical conductivity and pressure sensitivity of lime-improved silty sand reinforced with Carbon Fiber Powder (CFP) as the conductive medium. The influence of CFP dosage, moisture content and curing duration on the unconfined compressive strength, initial resistivity and pressure sensitivity of the improved soil was systematically analysed. The results showed that the unconfined compressive strength varied non-monotonically with increasing CFP dosage, reaching a peak at a dosage of 1.6%. Furthermore, the initial resistivity showed slight variations under different moisture conditions but eventually converged towards the conductive percolation threshold at a dosage of 2.4%. It is worth noting that CFP reinforced lime-improved silty sand (CRLS) exhibit a clear dynamic synchronization of strain with stress and resistivity rate of variation. The pressure sensitivity was optimized with CFP dosages ranging from 1.6% to 2.0%. Both insufficient and excessive dosages had a negative impact on pressure sensitivity. It is important to consider the weakening effect of high moisture content on the pressure sensitivity of the specimens in practical applications. |
| Key words: lime-improved silty sand CFP unconfined compressive strength resistivity pressure-sensitivity |
| DOI：10.11916/j.issn.1005-9113.24006 |
| Clc Number:TU521 |
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| Descriptions in Chinese: |
| 碳纤维粉增强石灰改良粉砂土的压敏性能研究 王丽霞, 胡子麟, 王 晴, 张云龙 （吉林建筑大学 交通科学与工程学院，长春 130119） 中文说明：本研究以碳纤维粉(CFP)作为导电介质，测试了石灰改良粉砂土的导电性和压敏性，系统分析了CFP掺量、含水率和养护龄期对改良土无侧限抗压强度、初始电阻率和压敏性的影响。结果表明，无侧限抗压强度随CFP掺量的增加呈非单调变化，在掺量为1.6%时达到峰值。不同含水率条件下，初始电阻率随CFP掺量增加的变化规律略有不同，2.4%掺量下初始电阻率最接近导电逾渗阈值。碳纤维粉增强石灰改良粉砂土(CRLS)的应力、电阻率变化率与应变动态变化具有显著同步性。压敏性在CFP掺量为1.6%至2.0%时达到最优，CFP掺量过少或过多均对压敏性产生负面影响。在实际应用中，需要考虑高含水率对试样压敏性的削弱作用。 关键词：石灰改良粉砂土、碳纤维粉、无侧限抗压强度、电阻率、压敏性 |
