Comparative Assessment of Deformation Under Plate Bearing Test and CBR Test for Subgrade Soil

S. Sarsam
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Abstract

A significant variation in the strength and deformation behavior of subgrade soil when tested in the laboratory and in the field. However, correlation of such variables is essential to evaluate the quality of the constructed subgrade. An attempt has been made in the present investigation to assess the deformation of control and stabilized subgrade soil in the laboratory and in the field. California bearing ratio (CBR) test was conducted in the laboratory and the static plate bearing test (PBT) was conducted in the field. Subgrade soil samples were stabilized with 6% lime, 17 % Cationic Emulsion, and combination of lime and emulsion. Similar stabilization was conducted at test sections in the field. The behavior of the control and stabilized soil in deformation under static PBT in the field and CBR in the laboratory was monitored and evaluated. It was noticed that polynomial correlation exists with high coefficient of determination between laboratory and field deformation for stabilized soil. It was observed that the deformation under CBR test decreased after implication of lime by (96 and 88) % for unsoaked and soaked testing conditions respectively. The deformation decreases by (92 and 85.6) % for unsoaked and soaked testing conditions respectively when emulsion was implemented. The deformation decreases by (91 and 88) % for unsoaked and soaked testing conditions respectively when combined stabilization was implemented. However, the deformation under PBT decreases by (75, 56, and 50) % for lime, emulsion, and combined stabilization processes respectively. It was concluded that testing condition (soaked or unsoaked) has no significant impact on the deformation of stabilized soil while it has a significant influence on the deformation of untreated soil under CBR test. On the other hand, the deformation of control soil shows no significant variation among field and laboratory testing in the model, however, the stabilized soil samples exhibit higher influence of field deformation on the polynomial models.
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路基土板压试验与CBR试验变形对比评价
在实验室和现场测试时,路基土的强度和变形行为的显著变化。然而,这些变量之间的相关性对于评价所建路基的质量至关重要。本研究尝试在实验室和现场对控制和稳定路基土的变形进行评估。室内进行了加州承载比(CBR)试验,现场进行了静力板承载试验(PBT)。路基土样分别用6%石灰、17%阳离子乳液和石灰与乳液混合稳定。在现场的试验段也进行了类似的稳定化。对控制土和稳定土在静力PBT和实验室CBR作用下的变形行为进行了监测和评价。结果表明,稳定土的室内变形与现场变形之间存在多项式相关关系,且具有较高的确定系数。结果表明,在未浸水和浸水试验条件下,石灰对CBR试验变形的影响分别为96%和88%。在未浸水和浸水试验条件下,掺加乳液后的变形量分别减少了92%和85.6%。采用复合稳定化后,未浸水和浸水试验条件下的变形量分别减少了91%和88%。然而,在PBT作用下,石灰、乳化液和复合稳定化处理的变形分别减少了(75、56和50)%。综上所述,试验条件(浸水或未浸水)对稳定土的变形影响不显著,而对CBR试验下未处理土的变形影响显著。另一方面,在模型中,控制土的变形在现场和室内测试中没有显著变化,而稳定土样品的现场变形对多项式模型的影响较大。
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