Abstract

The increase in the volume of scrap tires has led to environmental concerns in different locations of the world, particularly in the coastlines. Managing this solid waste, including reuse in civil engineering applications (e.g. geotechnical projects) can be an effective solution to solve the problem. A series of drained triaxial tests was performed on Qeshm calcareous soil obtained from Qeshm Island. Specimens were prepared at loose and dense relative densities and mixed with different percentages of tire crumbs (TCs), including 0%, 10%, 20%, 30%, and 50%. The variation ratio parameter was introduced to evaluate the effect of TCs on the engineering properties of the soil-tire mixture. Based on the results, the stress–strain behavior of the calcareous soil was strongly influenced by TCs contents. As the tire content (TC) increases, the stress transfer mechanism changes from particle-particle to tire-tire, which results in a shear strength reduction. For an example, the addition of 50% of TCs to the calcareous soil resulted in a 64% reduction in the maximum deviatoric stress under a confining pressure of 600 kPa. In addition, the secant modulus at maximum deviatoric strength of the soil-tire mixture with 50% of TCs decreased about 80%.

摘要

废轮胎数量的增加导致了世界不同地区的环境问题，特别是在海岸线。管理这种固体废物，包括在土木工程应用（例如岩土工程）中的再利用，可以成为解决问题的有效解决方案。对从 Qeshm 岛获得的 Qeshm 钙质土进行了一系列排水三轴试验。以松散和致密的相对密度制备试样，并与不同百分比的轮胎碎屑 (TC) 混合，包括 0%、10%、20%、30% 和 50%。引入变异比参数来评估TCs对土胎混合物工程特性的影响。根据结果​​，钙质土壤的应力-应变行为受 TCs 含量的强烈影响。随着轮胎含量（TC）的增加，应力传递机制从颗粒-颗粒转变为轮胎-轮胎，导致剪切强度降低。例如，向钙质土壤中添加 50% 的 TC 会导致在 600 kPa 围压下的最大偏应力降低 64%。此外，具有 50% TCs 的土胎混合物在最大偏强度下的割线模量降低了约 80%。