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裂隙性是膨胀土的典型工程地质特性之一,对其工程性质有重要影响,直接或间接地导致各种工程问题。通过对重塑膨胀土开展室内干湿循环试验,对获得的裂隙数字图像采用图像处理技术进行一系列预处理操作,提出了表面裂隙率、裂隙条数、裂隙总长度、裂隙平均宽度和绝对收缩率等量化指标,定量描述裂隙的形态特征,分析干湿循环过程中压实膨胀土的裂隙发育规律。结果表明:含水率和干湿循环次数是影响膨胀土裂隙发育的重要因素。随着含水率的减小,重塑膨胀土的裂隙发育程度总体上有增加的趋势。表面裂隙率、裂隙条数和总长度随含水率的减小逐渐增加,绝对收缩率随含水率减小而增大,而裂隙宽度与含水率之间没有明显的规律;随干湿循环次数的增加,裂隙进一步发育,裂隙条数、裂隙总长度、表面裂隙率增加,绝对收缩率总体增大,但裂隙平均宽度存在减小的现象,这与后期发育的大量微裂隙有关。
Crack is one of the typical engineering geological characteristics of expansive soils, which has an important influence on the engineering properties and leads directly or indirectly to various engineering problems. A series of pretreatment operations were carried out on the acquired digital images of fractures using the image processing technology. The surface fracture rates, the number of fractures, the total length of fractures, the average width of fractures and the absolute shrinkage Rate and other quantitative indicators to quantitatively describe the morphological characteristics of fractures, analysis of dry and wet cycles of compacted expansive soil fracture development. The results show that the moisture content and the number of wetting and drying cycles are important factors that affect the development of expansive soil fissures. As moisture content decreases, the degree of fracture development in remolded expansive soil tends to increase overall. The surface fracture rate, the number of fractures and the total length of the fractures gradually increase with the decrease of the water content, the absolute shrinkage increases with the decrease of the water content, but there is no obvious rule between the fracture width and the water content. Increase, further development of fissures, the number of fissures, the total length of fissures, the increase of surface fissures, the absolute shrinkage increases generally, but the average width of fissures decreases, which is related to the large number of micro-fissures developed in the later stage.