Experimental Investigation of Load Settlement Behavior of Coir Mat and Coir Fiber Reinforced Sand

ABSTRACT

An experimental study in terms of model footing test were performed to comparatively assess the effect of form of reinforcement, viz., mat and fiber, on the load intensity response of reinforced sand. Coir reinforcement was used in this present investigation to assess comparative performance of coir mat and coir fiber reinforced sand, as it is highly durable among all other natural materials. Model footing test were conducted by placing coir mat and coir fiber at different u/B ratios. Load deformation behavior was compared with the help of peak strain, bearing capacity ratio and settlement reduction factor. The experimental and calculated theoretical values of peak stress of coir mat reinforced sand were compared and found that both the values were in good agreement with predicted values. The results of the present experimental investigation indicated that the form of reinforcement viz., mat/grid and fibers has significant influence on load deformation behavior of reinforced sand. Coir mat when located within the failure zone intercepting the shear zone below the loaded footing is most beneficial in terms of load carrying capacity of reinforced sand, in consistent with earlier investigations. However maximum increase in bearing capacity of coir fiber reinforced sand does indicate an optimum u/B ratio of 1.0. Maximum SRF for coir mat reinforced sand corresponds to u/B = 0.6 where for coir fiber reinforced sand it corresponds to u/B = 1.0.

摘要

通过模型试验，比较分析了加筋形式，即垫料和纤维对加筋砂荷载强度响应的影响。椰壳纤维加固进行现状调查评估加筋砂土的棕垫和椰壳纤维的性能比较，它的所有其他天然材料中是非常耐用。模型基础试验是将棕垫和椰壳纤维在不同的u/B比率进行。通过峰值应变、承载力比和沉降折减系数对荷载变形性能进行了比较。实验和计算的棕垫峰值应力的理论值进行比较，发现加筋砂土的值与预测值吻合良好。试验结果表明，钢筋、格栅、纤维等形式对加筋砂土的荷载变形性能有显著影响。棕垫当位于破坏区拦截剪切带下面的基脚在加筋土承载力方面是最有益的，符合早期的调查。然而增加椰壳纤维承载能力最大的加筋砂表明最佳的u/B比率为1。对于棕垫最大SRF加筋砂对应于u/B=0.6，椰壳纤维加筋砂它对应于u/B  = 1 .0

KEYWORDS:

• Bearing capacity ratio
• coir fiber
• coir mat
• peak strain
• settlement reduction factor

关键词:

• 承载比
• 棕丝
• 棕垫
• 峰值应变
• 减少沉降的因素