李威, 庄建琦, 王颖. 2018: 饱和重塑黄土抗剪强度影响因素的试验研究. 工程地质学报, 26(3): 626-632. DOI: 10.13544/j.cnki.jeg.2017-214
    引用本文: 李威, 庄建琦, 王颖. 2018: 饱和重塑黄土抗剪强度影响因素的试验研究. 工程地质学报, 26(3): 626-632. DOI: 10.13544/j.cnki.jeg.2017-214
    LI Wei, ZHUANG Jianqi, WANG Ying. 2018: EXPERIMENTAL STUDY ON INFLUENCING FACTORS OF SHEAR STRENGTH OF SATURATED REMOLDED LOESS. JOURNAL OF ENGINEERING GEOLOGY, 26(3): 626-632. DOI: 10.13544/j.cnki.jeg.2017-214
    Citation: LI Wei, ZHUANG Jianqi, WANG Ying. 2018: EXPERIMENTAL STUDY ON INFLUENCING FACTORS OF SHEAR STRENGTH OF SATURATED REMOLDED LOESS. JOURNAL OF ENGINEERING GEOLOGY, 26(3): 626-632. DOI: 10.13544/j.cnki.jeg.2017-214

    饱和重塑黄土抗剪强度影响因素的试验研究

    EXPERIMENTAL STUDY ON INFLUENCING FACTORS OF SHEAR STRENGTH OF SATURATED REMOLDED LOESS

    • 摘要: 强降雨和灌溉导致黄土强度劣化并发生饱和破坏现象,进而诱发黄土滑坡,给当地带来严重的灾难。饱和黄土抗剪强度的影响因素较多,本文根据水头饱和与反压饱和相结合的原理,利用改装后的TFB-1型非饱和土应力-应变控制式三轴仪对党川地区马兰黄土重塑土样进行饱和试验和CU试验。分别采用50 kPa、100 kPa、200 kPa、400 kPa围压对饱和重塑黄土进行剪切速率分别为0.02 mm·min-1、0.06 mm·min-1、0.2 mm·min-1、0.4 mm·min-1的CU试验,探讨了围压和剪切速率对饱和重塑黄土抗剪强度的影响。研究发现:同一围压下,饱和重塑黄土的抗剪强度随着剪切速率的增大呈先增大后减小的趋势;同一剪切速率下,饱和重塑黄土的抗剪强度随着围压的增大逐渐增大;在干密度相同的条件下,饱和重塑黄土的总黏聚力及有效黏聚力随着剪切速率的增大先减小后增大,总内摩擦角及有效内摩擦角随着剪切速率的增大先增大后减小。该研究可为黄土滑坡预报和范围预测提供一定依据。

       

      Abstract: The saturated liquefaction failure of loess occurs frequently in the loess area due to heavy rainfall and irrigation, and induces loess landslide and brings huge economic loss to the local people. The shear strength of saturated loess is influenced by many factors. So saturation experiments of remolded loess of Malan loess in Dangchuan district are carried on the modified TFB-1 type triaxial apparatus of stress and strain controlled for unsaturated soil through the combination of hydraulic saturation and back pressure saturation. The saturated remolded soil samples are conducted on consolidated undrained test under the conditions of the confining pressure of 50 kPa, 100 kPa, 200 kPa and 400 kPa respectively, and the shear rate of 0.02 mm·min-1, 0.06 mm·min-1, 0.2 mm·min-1 and 0.4 mm·min-1 respectively. The influence of confining pressure and shear rate on the shear strength of saturated loess is discussed. The results show that the shear strength of the saturated remolded loess increases first and then decreases with the increase of shear rate under the same confining pressure. The shear strength of the saturated remolded loess is higher with the increase of confining pressure under the same shear rate. The total cohesion and the effective cohesion of the remolded loess increase first and then decrease with the shear rate under the same dry density. The total internal friction angle and the effective internal friction angle increase first and then decrease with the increase of shear rate. The study can provide a basis for loess landslide prediction and scope.

       

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