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等加载速率固结试验是在控制固结应力的施加速率为一常数条件下研究土体固结特性的试验方法。采用GDS高级固结仪,开展了四种加载速率与瞬时加载的软土固结试验研究,分析了土样的固结变形特性与孔隙水压力变化规律。试验与分析结果表明,加载速率越大土样固结速率越快,土样完成固结所需的时间越短;土体的最终变形量由固结应力大小决定,与加载速率无关;随着固结应力施加速率的增加,加载完成时土样的平均固结度呈下降趋势;加载速率越大,土样底部的孔隙水压力上升速率越快,孔隙水压力极值越大;孔隙水压力在固结应力加载完成前达到极值,随后呈下降趋势,有效应力迅速增加。
Equal Loading Rate The consolidation test is a test method to study the consolidation behavior of soils under the condition that the rate of consolidation stress is constant. Using GDS advanced consolidation machine, four kinds of soft soil consolidation tests with loading rate and transient loading were carried out, and the consolidation deformation characteristics and pore water pressure variation of soil samples were analyzed. The results show that the higher the loading rate is, the faster the soil consolidation rate is. The shorter the time required for soil consolidation, the final deformation of the soil is determined by the consolidation stress, which is independent of the loading rate. The average consolidation rate of soil samples decreases when the loading is completed. The larger the loading rate, the faster the rate of pore water pressure rise at the bottom of the soil sample, and the greater the pore water pressure extremes. The pore water pressure Reached the extreme value before the consolidation stress was loaded, then showed a downward trend, and the effective stress rapidly increased.