基于CPT的砂土液化风险评价分析及地基处理研究

Risk Assessment Analysis and Foundation Treatment of Sand Liquefaction Based on CPT

在砂土分布广泛的地区,地震液化是导致地基失稳和上部结构受损的直接原因之一,因此,判定地基土地震液化是岩土工程中的重要课题。阿联酋铁路项目部分位于近海沙漠地段,根据地勘结果存在松散砂层且地下水位高,受地震震动影响存在液化风险。本文针对该地质问题基于锥尖贯入测试(CPT)结果建立了砂土液化分析方法,并根据分析结果采用不同地基处理方式,通过实践证明该液化分析方法具有准确性和可行性。这为中东地区铁路防沙设计提供参考,具有实际工程价值和实践意义。

In areas where sandy soil is widely distributed,earthquake-induced liquefaction is one of the direct causes of foundation instability and damage to upper structures.Therefore,earthquake-induced liquefaction of foundation soil plays an important role in geotechnical engineering.The UAE railway project is partially located in the coastal desert area,and according to the geological survey results,there is a loose sand layer and a high groundwater level,which poses a risk of liquefaction due to seismic vibrations.In this paper,a liquefaction analysis method of sand is established based on CPT test results,and different foundation treatment methods are adopted according to the analysis results.The accuracy and feasibility of the liquefaction analysis method are proved by practice.It provides reference for the design of railway sand control in the Middle East and has practical engineering value and practical significance.