Evaluation of Bearing Capacity of Fly-Ash Highway Subgrade Based on Model Test
Evaluation of Bearing Capacity of Fly-Ash Highway Subgrade Based on Model Test
复制标题
基于模型试验的粉煤灰公路路基承载力评价
DOI：
10.1520/jte20170034
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发表时间：
2017-12
影响因子：
1.2
通讯作者：
Qian-qing Zhang
中科院分区：
文献类型：
--
作者：
Wei Cui;Xiao Zheng;Qian-qing Zhang
基于飞灰的力学性质和相似理论，建立了评价飞灰路堤实际承载能力的小比例尺地质力学模型。路堤模型分为两面：右侧由混凝土表面覆盖，左侧未覆盖。给出了模型路堤在加载过程中不同深度的应力和位移监测结果。在试验过程中，不同深度土体的附加应力和位移均随荷载的增加而增大。在大荷载作用下，覆土侧不同深度的位移均有较大幅度的增加，表明可能会发生塑性破坏，并会自下而上逐渐发展。在假定满足交通荷载要求的情况下，用模型试验得到的混凝土面层屈服覆盖的FA路堤的极限承载力可取为419kN。对于裸露的左侧，在一定的荷载作用下，承力板下方的土体很容易发生塑性破坏，从而导致附加应力的减小。塑性破坏在裸侧自上而下逐渐发展。无混凝土面层的FA路堤的极限承载力为193kN，可能不能满足车辆超载的要求。
Based on the mechanical properties of fly ash (FA) and the similarity theory, a small-scale geomechanical model was virtually built for evaluating the actual bearing capacity of FA embankments. The embankment model was divided into two sides: the right was covered by a concrete surface and the left was uncovered. The monitoring results of stress and displacement in different depths of the model embankment during the loading process were both presented. In the process of testing on the covered right side, both the additional stress and displacement of soil in different depths increased with an increasing load. There was a significant increase of displacement under large loading in different depths of the covered side, which suggested that plastic failure may happen and would gradually develop from bottom to top. The limit-bearing capacity of the FA embankment covered by concrete surface yield from the model test can be adopted as 419 kN that was assumed to fulfil the requirements of traffic load. As to the uncovered left side, plastic failure was very likely to occur in the soil beneath the bearing plate with a certain applied load, which caused a decrease of additional stress. Plastic failure gradually develops from top to bottom of the uncovered side. The limit-bearing capacity of the FA embankment without the concrete surface can be taken as 193 kN that may not meet the requirement for the overloading of vehicles.
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