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地下水位的波动引起毛细水对上部遗址体的反复作用,导致遗址体处于干湿循环交替的状态中,从而致使土遗址不断经受反复的湿胀干缩变化,使得遗址体内部发育大量的裂隙,内部结构变疏松,对遗址体造成极大的破坏,最终使遗址体抵抗外界侵蚀的能力下降,加速了土遗址的风化劣变。采用西安地区凤栖塬黄土模拟遗址原址土样进行室内干湿循环模拟试验,研究了在毛细水作用下经过多次干湿循环后,土样的外观形貌、无侧限抗压强度、抗水崩解性、微观结构的变化以及抗压强度随含水率的变化规律,结果表明:随着干湿循环次数的增加,土样的裂隙不断加以发育并相互贯通、无侧限抗压强度逐渐下降、崩解速度整体上呈现出上升的趋势、土颗粒粒径变小且空隙间距变大。
Fluctuations in groundwater level cause the repeated action of capillary water on the upper site, leading to the alternation of wetting and drying cycles. As a result, the site of earth continuously withstands the repeated wetting and drying shrinkage changes, resulting in the development of a large number of cracks in the site. Loose internal structure, causing great damage to the site, eventually reducing the ability of the site to resist outside erosion, accelerating the weathering and deterioration of the site. The indoor wet and dry cycle simulation test was conducted using the soil samples from the site of the Fengqianyuan Loess Simulated Site in Xi’an. The wetting and drying cycles of capillary water were used to study the appearance, unconfined compressive strength, Water disintegration, microstructure change and compressive strength with water content. The results show that with the increase of the number of drying and wetting cycles, the cracks in soil samples continue to develop and interpenetrate, and the unconfined compressive strength gradually increases As a whole, the rate of disintegration showed an upward trend, and the particle size of the soil became smaller and the space between the pores became larger.