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针对我国铁路改良土路基设计和施工缺乏相关标准,根据国内外有关资料以及现场施工中出现的问题,从改良土的强度随时间变化的特性出发,对改良土路基的设计及压实指标进行研究。提出改良土路基的标准设计强度应以控制路基面的变形为准,并考虑路基处于不利气候条件和施工时的强度损失,对设计强度作相应提高;建议改良土强度采用改良土养生7 d的饱和无侧限抗压强度,并考虑延迟压实的影响,留有一定的安全储备;为了确保路基压实质量检测的快捷性、有效性及可控性,建议改良土路基的压实指标采用压实度和改良土掺入料的掺入量,并且在压实度的计算中采用与现场施工等时的室内最大干密度。
Aiming at the lack of relevant standards for the design and construction of improved soil subgrade in China, according to the relevant data at home and abroad and the problems occurred in the construction, the design and compaction indexes of improved soil subgrade are studied from the characteristics of soil strength change with time . It is proposed that the standard design strength of improved soil subgrade should be controlled by controlling the deformation of subgrade and considering the unfavorable weather conditions and the strength loss during construction, Saturated unconfined compressive strength, and consider the impact of delayed compaction, leaving a certain safety reserves; In order to ensure the subgrade compaction quality inspection of the fast, effective and controllability, it is recommended that the improvement of subgrade compaction indicators Compaction, and incorporation of soil adulterated material, and the maximum dry density in the room at the time of on-site construction is used in the compaction calculation.