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DETERIORATION CHARACTERISTICS OF ILI LOESS PROPERTIES UNDER FREEZE-THAW CYCLES AND THEIR INFLUENCE ON LANDSLIDE STABILITY
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摘要: 新疆伊犁地区作为我国西北地区气候较敏感区域之一，地质灾害较发育，且地质灾害具有危险性严重、危害程度大、成灾速度快等特点，对社会经济发展影响巨大。为加强地质灾害防治，构建安全的生产生活环境，本文以伊犁地区新源县阿勒马勒镇黄土滑坡为研究对象，综合利用野外地质调查、现场取样、室内试验分析等方法，分析了该地区黄土在冻融循环作用下其强度变化的特征以及对滑坡稳定性的影响。结果表明，随着冻融循环次数的增加，滑坡土体强度出现不同程度劣化，与此同时，滑坡稳定性变化趋势也与土体强度劣化趋势一致。分析认为，在冻融循环作用下，黄土空间结构出现不同程度破坏，造成土颗粒级配及接触类型发生变化，使得土体强度出现不同程度的衰减。滑坡整体稳定性受冻融作用的影响而产生变化，在经历3次冻融循环以后，滑坡稳定性发生突变，之后滑坡长期处于蠕滑状态。在此过程中，黄土滑坡变形失稳区域主要集中在滑坡浅层，变形贯穿区域仅限于上层冻结区域土层，不易出现中深层滑坡，滑坡变形程度较轻。研究成果可为新疆伊犁地区地质灾害防灾减灾提供参考价值，也可为类似地区的黄土滑坡地质灾害研究提供参考。Abstract: As one of the more sensitive climatic regions in northwest China, the Ili region of Xinjiang has more developed geological hazards. The geological hazards are characterized by serious hazards, high degree of danger and rapid disaster formation, which have great impact on social and economic development. In order to strengthen the prevention and control of geological hazards and build a safe production and living environment, this paper takes the loess landslide in Almal Town, Xinyuan County, Ili Region as the research object. It analyses the characteristics of the strength change of the loess in the area under the action of freeze-thaw cycle and the influence on the stability of the landslide using field geological survey, field sampling and indoor test analysis. The results of the study showed that the strength of the landslide soil deteriorated to different degrees as the number of freeze-thaw cycles increased, while the trend of landslide stability was also consistent with the deterioration of soil strength. The analysis suggests that the spatial structure of the loess is damaged to varying degrees by the freeze-thaw cycles, resulting in changes in soil particle gradation and contact type, which causes the soil strength to deteriorate to varying degrees. The overall stability of the landslide is affected by the freeze-thaw action and changes. After three freeze-thaw cycles, the stability of the landslide changes abruptly, after which the landslide is in a long-term creep-slip state. During this process, the deformation and destabilisation area of the loess landslide is mainly concentrated in the shallow layer of the landslide, and the deformation penetration area is limited to the upper frozen area soil layer, which is not easy to occur in the middle and deep layers, and the degree of landslide deformation is relatively light. The research results can provide reference value for the prevention and mitigation of geological disasters in the Ili region of Xinjiang, and provide guidance for the study of geological disasters of loess landslides in similar areas.
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Key words:
- Freeze-thaw cycles /
- Deterioration /
- Loess landslides /
- Stability analysis
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图 1 研究区月平均降水量及蒸发量统计图
Figure 1. Monthly average precipitation and evaporation statistics for the study area
图 28 冻融循环斜坡稳定系数演化曲线图
Figure 28. Evolution of slope stability coefficients for freeze-thaw cycles
表 1 Duncan-Chang双曲线模型分析参数表
Table 1. Table of parameters for Duncan-Chang hyperbolic model analysis
冻融循环次数 含水率/% a Ei (σ1-σ3)ult b Rf (σ1-σ3)f 0 14 0.000 01 100 000 99.1 0.0089 1 99.1 0.000 01 100 000 173.7 0.0058 1 173.11 0.000 008 125 000 219.4 0.0046 1.07 235.32 16 0.000 07 14285.71 94.2 0.01 1 94.2 0.000 01 10 000 359.88 0.0026 0.99 356.88 0.000 05 20 000 418.2 0.0024 0.99 415.2 18 0.000 02 50 000 194.51 0.0033 1 194.51 0.000 03 33333.33 392.82 0.0023 1 392.82 0.000 04 25 000 505.71 0.0017 1 505.71 20 0.000 08 12 500 174.98 0.0051 1.11 194.51 0.000 04 25 000 258.48 0.0035 1.52 392.82 0.000 03 33333.33 400.29 0.0023 1.26 505.71 1 14 0.000 09 11 111.11 71.01 0.0134 1 71.01 0.000 005 200 000 169.73 0.006 0.99 167.73 0.000 005 200 000 367.6 0.0028 0.98 361.86 16 0.0001 10 000 207.93 0.00336 1 207.93 0.00002 50 000 215.7 0.0045 1 215.7 0.000005 200 000 379.21 0.0027 0.99 375.21 18 0.0001 10 000 198.87 0.0041 1 198.87 0.00004 25 000 405.43 0.0021 1 405.43 0.00002 50 000 710.38 0.0012 1 710.38 20 0.00009 11111.11 157.7 0.0055 1 157.7 0.00004 25 000 225.6 0.004 1 225.6 0.00002 50 000 343.5 0.0028 1 343.85 3 14 0.00009 11 111.11 96.97 0.135 1 96.97 0.00001 100 000 158.32 0.0059 0.97 154.32 0.000009 111111.1 372.09 0.0049 0.98 365.09 16 0.00007 14285.71 188.51 0.0047 1 188.51 0.00001 10 000 235.73 0.0042 991.52 233 729 0.00005 20 000 380.98 0.0041 0.96 363.98 18 0.00002 50 000 193.12 0.0029 1 193.12 0.00003 33333.33 429.96 0.002 1 429.96 0.0001 10 000 498.31 0.001 1 498.31 20 0.00005 20 000 136.54 0.00008 1 136.54 0.00001 10 000 221.59 0.0041 1 221.59 0.00002 50 000 321.66 0.0029 1 321.66 5 14 0.00006 16 666.67 96.97 0.011 1 96.97 0.000008 125 000 157.32 0.0067 0.98 154.32 0.000009 111111.1 366.09 0.0027 1 365.09 16 0.00009 11111.11 168.9 0.0052 1 168.9 0.00003 33333.33 271.97 0.0034 1 271.97 0.0000008 1 250 000 302.34 0.0036 0.99 299.34 18 0.0001 10 000 181.96 0.0046 1 181.96 0.00003 33333.33 473.07 0.0018 1 473.07 0.00001 10 000 625.24 0.0015 1 625.24 20 0.0001 10 000 127.54 0.007 0.97 127.54 0.000 03 33333.33 299.8 0.0031 1 299.8 0.00002 50 000 332.37 0.0028 1 332.37 7 14 0.00004 25 000 85.94 0.001 1 85.94 0.00002 50 000 284.34 0.0034 1 284.4 0.000004 250 000 334.49 0.003 1 334.49 16 0.0001 10 000 184.6 0.004 1 184.6 0.00001 100 000 291.2 0.0033 0.98 285.76 0.00002 50 000 344 0.0039 0.98 338.8 18 0.00007 14285.71 251.66 0.0033 1 251.66 0.00002 50 000 420.86 0.002 1 420.86 0.00001 10 000 635.99 0.0015 1 635.39 20 0.00007 14285.71 165.85 0.0055 1 165.85 0.00004 25 000 265.83 0.0035 1 265.83 0.00002 50 000 383.79 0.0025 1 383.79 10 14 0.000 03 33333.33 77.33 0.408 1 77.33 0.000 03 33333.33 276.74 0.0033 1 276.74 0.000007 142857.1 406.53 0.0024 1 406.3 16 0.00007 14285.71 149.83 0.006 1 149.83 0.00002 50 000 283.31 0.0034 1 283.31 0.000002 500 000 306.8 0.0036 0.99 303.12 18 0.0001 10 000 199.86 0.0036 1 199.86 0.00001 10 000 399.23 0.0024 1 399.23 0.00002 50 000 498.22 0.0018 1 498.22 20 0.0002 5000 173.71 0.0044 1 173.71 0.00004 25 000 261.18 0.0035 1 261.18 0.00001 10 000 302.37 0.0032 1 302.37 
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表 2 坡体岩层力学参数表
Table 2. Table of mechanical parameters of the slope rock formations
岩层 冻融循环次数 重度/N·m-3 黏聚力/kPa 内摩擦角/(°) 表层冻融层 0 19.21 32.77 34.89 1 19.21 32.87 34.68 3 19.21 29.37 32.67 5 19.21 34.55 32.76 7 19.21 45.94 30.26 10 19.21 22.7 34.09 粉土 19.92 20.43 22.98 风化层 15.01 6.88 23.32
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表 3 滑坡稳定状态划分表
Table 3. Table of landslide stability state classification
滑坡稳定系数Fs Fs＜1.0 1.0≤Fs＜1.1 1.1≤Fs＜1.2 Fs≥1.2 滑坡稳定状态 不稳定 欠稳定 基本稳定 稳定
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