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蒋应军,王翰越,乔怀玉,等. 水、干湿及冻融循环作用下水泥改良黄土路基稳定性[J]. 科学技术与工程, 2020, 20(35): 14592-14599.
jiangyingjun,et al.Study on the Stability of Cement-Improved Loess Subgrade under Water, Wet-Dry and Freeze-Thaw Cycles[J].Science Technology and Engineering,2020,20(35):14592-14599.
水、干湿及冻融循环作用下水泥改良黄土路基稳定性
Study on the Stability of Cement-Improved Loess Subgrade under Water, Wet-Dry and Freeze-Thaw Cycles
投稿时间:2020-03-01  修订日期:2020-08-31
DOI:
中文关键词:  水泥改良黄土 路基 水稳系数 干湿循环 冻融循环
英文关键词:Cement-improved  loess subgrade  water stability coefficient  dry-wet cycle  freeze-thaw cycle
基金项目:陕西省交通运输厅科技项目(18-02K)
              
作者单位
蒋应军 长安大学
王翰越 长安大学公路学院
乔怀玉 陕西省铁路集团有限公司
岳卫民 陕西西法(北线)城际铁路有限公司
董鑫 陕西省铁路集团有限公司
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中文摘要:
      为了揭示水泥改良黄土路基稳定性影响因素,研究了不同水泥剂量、压实系数、养生龄期下改良黄土水稳系数、干湿残留强度比及冻融残留强度比的变化规律。结果表明:水泥剂量≥4%,改良黄土水稳系数增长曲线平缓,改善改良黄土路基水稳定性较小;压实系数由0.92提高至1.00,90 d水稳系数提高了21.6%~25.6%,水稳定性显著提高;前14 d水稳系数增长速度明显快于后期水稳系数增长速度,养生龄期由14 d延长至90 d,水稳系数约提高了7.4%。干湿、冻融作用下改良黄土抗压强度分别随水泥剂量增加或压实系数提高呈线性增长;随循环作用次数增加,改良黄土抗压强度逐渐减小,干湿循环次数≥15次后的抗压强度趋于稳定值,干湿15次的残留强度比约为44%;当干湿循环次数≥12次后,水泥剂量≥3%下改良黄土抗压强度逐渐减小至稳定值,冻融12次的残留强度比平均为42%。
英文摘要:
      In order to reveal the influencing factors of the stability of cement-improved loess subgrade, the variation laws of different cement dosages, compaction coefficients, water-stability coefficients of modified loess, dry-wet residual strength ratio, and freeze-thaw residual strength ratio at different ages were studied. The results show that: the cement dosage is ≥4%, the growth curve of the water stability coefficient of the improved loess is gentle, and the improvement of water stability is small; the compaction coefficient is increased from 0.92 to 1.00, and the water stability coefficient is increased by 21.6% to 25.6% at 90 days, and the water stability The water stability coefficient increased significantly faster in the first 14 days than in the later stage. The health-care period was extended from 14 days to 90 days, and the water stability coefficient increased by approximately 7.4%. The compressive strength of the improved loess under dry, wet, and freeze-thaw conditions increased linearly with the increase of the cement dose or the compaction coefficient. As the number of cycles increased, the compressive strength of the modified loess gradually decreased. The compressive strength tends to a stable value, and the residual strength ratio of 15 times of wet and dry is about 44%; after the number of wet and dry cycles ≥ 12 times, the compressive strength of the improved loess gradually decreases to a stable value at a cement dosage ≥ 3%, and freezes The average residual strength ratio after melting 12 times was 42%.
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