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为掌握大气长期作用下公路膨胀土路堤湿度平衡规律,为膨胀土路堤处治提供依据,以广西包盖膨胀土路堤为例,考虑膨胀土填料受力状态,开展应力相关土水特征曲线试验,揭示了不同应力状态下压实膨胀土平衡湿度随吸力的变化规律。通过现场监测,分析了包盖膨胀土路堤1.5 a内的湿度变化和变形特征,利用土与大气相互作用计算方法,对广西气候条件下包盖膨胀土路堤运营10 a内的湿度变化过程进行了数值模拟。研究结果表明:0~3 MPa吸力范围内应力对膨胀土的平衡湿度有显著影响;1 a内膨胀土路堤内部含水率有缓慢增加的趋势,越靠近边部含水率波动越剧烈,路堤总体表现为不均匀沉降;6 a后路堤内部湿度逐渐趋于稳定,达到湿度平衡状态;膨胀土的湿法重型击实最佳含水率接近路堤平衡含水率,南方湿热地区膨胀土路堤宜采用湿法重型击实标准控制压实。
In order to grasp the law of moisture balance of highway expansive soil embankment under the action of atmosphere for a long period of time and provide the basis for the treatment of expansive soil embankment, taking Guangxi expansive soil embankment as an example, considering the stress state of expansive soil filler, carrying out stress-related soil- Under different stress conditions, the equilibrium humidity of compacted expansive soil changes with suction. Through on-site monitoring, the change of humidity and deformation characteristics within 1.5 a of the embankment with expansive soil cover were analyzed. Using the calculation method of the interaction between soil and atmosphere, the process of humidity change within 10 years of expansive soil embankment under Guangxi climate was carried out Numerical Simulation. The results show that the stress in the suction range of 0-3 MPa has a significant effect on the equilibrium humidity of expansive soils. Within 1 a, the internal moisture content of expansive soil embankments tends to increase slowly. The average moisture content of the wet-type heavy compaction of expansive soil is close to the equilibrium moisture content of the embankment. The expansive soil embankment in the wet and hot areas in the south should adopt the wet heavy method Compaction standard control compaction.