Indonesia, which located in tropical region, continuously undergoes wetting and drying cycles due to the changeable seasons. An important role in activating the clay minerals on tropical residual soils is the main factor that affects the static and dynamic properties, such as: volume change, soil suction and dynamic modulus. The purpose of this paper is to evaluate the effect of drying-wetting cycles repetition on volume change, soil suction and mechanical characteristics of natural and stabilization of residual soils from Jawa Timur - Indonesia. The natural undisturbed and stabilized residual soil sample was naturally and gradually dried up with air to 25%, 50%, 75%, and 100 % of the initial water content. The wetting processes were carried out with the gradual increment water content of 25 %(w_(sat) - wi), 50 %(w_(sat) - Wi), 75 %(w_(sat) - Wi), up to 100 %(w_(sat) - wi). The Direct Shear test is used to measure the mechanic properties, and Whatman filter paper No. 42 is used to measure the soil suction. The drying-wetting processes were carried out for 1, 2, 4, and 6 cycles. The laboratory test results showed that, the void ratio decreased, the unit weight, cohesion and the internal friction angle were increasing due to stabilization. Drying-wetting cycle repetition reduces void ratio, negative pore-water pressure, cohesion and internal friction angle of natural and stabilized soils. Briefly, the decreased of mechanical soil properties was proven from the physical properties change observation.
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机译：由于可变的季节，位于热带地区的印度尼西亚，连续地经历润湿和干燥循环。激活热带残留土壤上激活粘土矿物的重要作用是影响静态和动态性质的主要因素，例如：体积变化，土壤吸力和动态模量。本文的目的是评估干燥润湿循环重复对Jawa Timur - 印度尼西亚jawa Timur - 印度尼西亚的剩余土壤的体积变化，土壤吸力和机械特性的影响。天然不受干扰和稳定的残余土样品自然并逐渐用空气干燥至25％，50％，75％和100％初始含水量。润湿方法以逐渐增量的水含量为25％（W_（SAT） - Wi），50％（W_（SAT） - Wi），75％（W_（SAT） - Wi），高达100％ （w_（sat） - wi）。直接剪切试验用于测量机械性能，而Whatman滤纸42号用于测量土壤吸力。干燥润湿方法为1,2,4和6个循环。实验室测试结果表明，由于稳定，空隙率降低，单位重量，内聚力和内部摩擦角度增加。干湿循环重复降低了自然和稳定的土壤的空隙率，负孔隙水压，凝聚力和内摩擦角。简而言之，从物理性质变化观察结果证明了机械土壤性质的降低。
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