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为了解决膨胀土填方边坡的稳定性问题,查明膨胀土易产生浅层破坏的原因,研究膨胀土中裂隙发育的规律,在明确填方边坡的裂隙类型为风化裂隙的基础上,利用矢量图技术定量化描述了裂隙的演化规律,获取了裂隙的几何形态及裂隙度等一系列参数;进而分别探讨了干湿循环、含水量及大气温度等因素对膨胀土填方边坡裂隙发育的影响。研究结果表明:监测期内裂隙分布不具备定向规律,且系统格局非常混乱,基本不存在相互平行的裂隙;裂隙在降雨时闭合,在蒸发过程中再次开裂,并互相连通逐渐发育成网状,但到一定程度后基本稳定;随着循环次数的增加,土体逐步走向完全破碎。
In order to solve the stability problem of expansive soil filling slope and find out the reason that the expansive soil is easy to produce shallow damage, the regularity of fracture development in expansive soil is studied. On the basis of defining the type of weathering fissure in expansive soil, A series of parameters such as geometry and fracture degree of fractures were quantitatively described by using vector graph technique. Then the factors such as dry-wet cycle, water content and atmospheric temperature were used to analyze the fracture fissures Developmental effects. The results show that there is no directional regularity in the fracture distribution during the monitoring period and the system is in a very chaotic condition with almost no parallel cracks. The fractures are closed during rainfall, re-crack during evaporation and gradually develop into a network. But to a certain extent after the basic stability; with the increase in the number of cycles, the soil gradually to completely broken.