Scholarlink

<p>Improving loose sandy soils beneath shallow foundations remains a persistent geotechnical challenge, particularly when practical and economical improvement solutions are sought. This study reports a laboratory investigation of the coupled effects of cement content (3–9%), curing duration (3–28 days), and improvement geometry (defined by the depth ratio, D/B = 0.5–2.0, and width ratio, W/B = 2–5, where B is the footing width) on the load–settlement response of a square footing resting on loose sand (relative density, Dr = 30%) treated with sulfate-resistant Portland cement. Bearing performance was assessed at a normalized settlement ratio of s/B = 10%. The results show that improvement effectiveness is primarily controlled by geometry, with a minimum depth of D/B = 1.0 required to move from localized punching to more efficient load transfer. Cement content produced nonlinear strength gains that were strongly width-dependent; at D/B = 1.0, increasing cement from 3 to 9% raised the bearing pressure from 378 to 967 kPa for W/B = 5, whereas the corresponding increase for W/B = 2 was limited from 168 to 261&#xa0;kPa. Curing further enhanced performance; for the 5% cement series at D/B = 1.0 and W/B = 2, the improvement ratio (relative to untreated sand) increased from 764% at 3&#xa0;days to 1257% at 28&#xa0;days. Based on the observed width efficiency, a configuration near D/B ≈ 1.5 and W/B ≈ 4 is proposed as an effective design boundary that delivers substantial capacity gains with efficient material usage while limiting the tendency toward brittle response in wide, stiff improvements.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Cemented Sand Beneath Shallow Footings: Effects of Cement Content, Improvement Geometry (D/B, W/B), and Curing Period on Bearing Capacity

  • 期刊论文

  • 发表日期：

    2026年4月13日

查看全文
  • Ali J. Mutar,
  • Mohammed Khachi Hatem

摘要

Improving loose sandy soils beneath shallow foundations remains a persistent geotechnical challenge, particularly when practical and economical improvement solutions are sought. This study reports a laboratory investigation of the coupled effects of cement content (3–9%), curing duration (3–28 days), and improvement geometry (defined by the depth ratio, D/B = 0.5–2.0, and width ratio, W/B = 2–5, where B is the footing width) on the load–settlement response of a square footing resting on loose sand (relative density, Dr = 30%) treated with sulfate-resistant Portland cement. Bearing performance was assessed at a normalized settlement ratio of s/B = 10%. The results show that improvement effectiveness is primarily controlled by geometry, with a minimum depth of D/B = 1.0 required to move from localized punching to more efficient load transfer. Cement content produced nonlinear strength gains that were strongly width-dependent; at D/B = 1.0, increasing cement from 3 to 9% raised the bearing pressure from 378 to 967 kPa for W/B = 5, whereas the corresponding increase for W/B = 2 was limited from 168 to 261 kPa. Curing further enhanced performance; for the 5% cement series at D/B = 1.0 and W/B = 2, the improvement ratio (relative to untreated sand) increased from 764% at 3 days to 1257% at 28 days. Based on the observed width efficiency, a configuration near D/B ≈ 1.5 and W/B ≈ 4 is proposed as an effective design boundary that delivers substantial capacity gains with efficient material usage while limiting the tendency toward brittle response in wide, stiff improvements.