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膨胀土在大气季节性干湿循环效应的影响下,其完整性与连续性常遭到严重破坏。为探究干湿循环效应对膨胀土胀缩及开裂性的影响,开展了膨胀土三轴样干湿循环试验,得到随循环次数增多,膨胀土的胀缩性降低,表面裂隙发育。研究表明干湿循环过程中膨胀土发生的持续膨胀与收缩,破坏了膨胀土的原有结构,并最终导致其抗剪强度的降低。
The integrity and continuity of expansive soils are often severely damaged under the influence of seasonal dry-wet cycles in the atmosphere. In order to explore the effect of cyclic wetting and drying cycles on the expansion and contraction and cracking of expansive soils, a triaxial wet-dry cycle test of expansive soils was carried out. With the increase of cycles, the expansibility of expansive soils decreased and the surface fissures developed. The results show that the expansive soils in the process of drying and wetting continue to expand and contract, which destroy the original structure of expansive soils and eventually lead to the decrease of shear strength.