An experimental study of the anti-cracking characteristics of foreign-clay based on rock slope
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摘要:
客土喷播是当前对于裸露岩质边坡生态修复的一种常用技术。然而，边坡表层黏性客土在干旱的气候条件下，内部水分大量流失将容易产生干缩、开裂现象，进而影响坡面的整体稳定性，以及表面植被的生长。本文针对边坡表层黏性客土开裂问题，通过改变土体厚度，以及制备不同聚氨酯（PU）浓度的高分子复合黏性客土，开展一系列室内蒸发试验，以分析土体表面裂隙发育特征，并结合数字图像处理技术（PCAS），对裂隙网络的几何形态进行定量分析，进一步探究土体厚度和高分子添加剂浓度对其裂隙发育的影响。
Abstract:Foreign-clay spraying is currently a common technology for ecological restoration of exposed rock slopes. However, under arid climate conditions, the large amount of internal water loss of the foreign-clay on the slope surface will easily cause shrinkage and cracking, which will affect the overall stability of the slope and the growth of surface vegetation. In this paper, aiming at the problem of cracking of the foreign-clay on the slope surface, by changing the thickness of the soil, polymer composite foreign-clay with different polyurethane (PU) concentrations is prepared to analyze the development characteristics of cracks through a series of indoor drying tests. In addition, particles (Pores) and cracks analysis system (PCAS) are used to conduct a quantitative analysis of the geometry of crack network, so as to further explore the influence of soil thickness and polymer additive concentration on fracture development.
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Key words:
- rock slope /
- foreign-clay /
- clay thickness /
- polymer materials /
- crack development characteristics
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表 1 不同厚度试样表面开裂参数统计表
Table 1. Statistics of cracking parameters on the surface of the samples with different thicknesses
试样编号
Rsc/%
Nf
Na
S/像素
Lav/像素
Wav/像素
S1 10.70 400 214 194949 128.15 81.46 S2 14.14 181 76 257678 207.89 133.27 S3 16.07 60 34 292922 307.89 170.92 S4 19.15 35 29 345635 310.49 173.90 
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表 2 不同聚氨酯浓度的试样表面开裂参数统计
Table 2. Statistics of cracking parameters on the surface of the samples with different CPU
试样编号
Rsc/%
Nf
Na
S/像素
Lav/像素
Wav/像素
S4 19.15 35 29 345635 310.49 173.90 S5 19.02 42 29 348008 276.25 174.6 S6 19.12 45 25 351756 315.03 171.47 S7 20.53 44 26 372286 347.75 185.32 S8 20.55 35 22 351467 355.59 207.05
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