SHEAR STRENGTH CHARACTERISTICS OF SOIL IN THE SLIDING ZONE ON HIGHWAY SLOPE IN GUIZHOU PROVINCE
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摘要:
为了探究公路旁边坡滑带土的强度性质和法向变形性质的变化规律，以贵州山区公路为例，利用环剪仪研究了滑带土在不同含水率和不同法向应力下的抗剪强度特性.结果表明：不同含水率滑带土的峰值强度和残余强度与法向应力间具有良好的线性关系；法向应力越大，试样达到峰值强度所需要的剪切位移也会越大；含水率较高的条件下，滑带土从峰值强度下降到达残余强度期间内，剪应力有增加的趋势；随着含水率的增加，黏聚力呈现增大的趋势，内摩擦角在塑限附近达到峰值，之后逐渐减小.滑带土性质的研究可为公路旁滑坡识别与预防提供科学依据.
Abstract:To explore the change rule of strength and normal deformation properties of soil in the sliding zone on highway slopes, taking the mountainous highway in Guizhou Province as an example, the paper studies the shear strength characteristics of sliding zone soil under different water content and normal stress by ring shear apparatus. The results show that there is a good linear relation between the peak strength and residual strength of sliding zone soil with different water content and the normal stress. The larger the normal stress is, the larger the shear displacement required for the specimen to reach the peak strength will be. Under the condition of high water content, the shear stress tends to increase when the sliding zone soil decreases from peak strength to residual strength. With the increase of water content, the cohesion shows an increasing trend, and the internal friction angle reaches the peak near the plastic limit and then gradually decreases. The study on the properties of sliding zone soil will provide scientific basis for the identification and prevention of highway landslides.
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Key words:
- landslide /
- ring shear test /
- sliding zone soil /
- moisture content /
- normal stress /
- shear strength /
- Guizhou Province
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表 1 滑带土基本物理性质
Table 1. Basic physical properties of sliding zone soil
密度/g·cm-3 液限/% 天然含水率/% 比重(GS) 塑限/% 塑性指数/% 干密度/g·cm-3 1.30 52.89 40.05 2.57 38.74 14.15 0.77 
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表 2 滑带土环剪试验方案
Table 2. Ring shear test scheme of sliding zone soil
含水率ω/% 法向应力σ/kPa 试样编号 36 20, 50, 80 A-1, A-2, A-3 40 20, 50, 80 B-1, B-2, B-3 44 20, 50, 80 C-1, C-2, C-3
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表 3 不同含水率滑带土的黏聚力与内摩擦角参数值
Table 3. Parameters of cohesion and internal friction angle of sliding zone soil with different water content
含水率/% CP/kPa φp/(°) Cr/kPa φr/(°) 36 137.14 52.17 129.13 47.47 40 173.01 33.45 148.23 41.10 44 199.67 28.01 182.97 30.49
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