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扬州瘦西湖隧道下穿蜀冈-瘦西湖风景区,全长2.8 km,场区土层10 m以下分布有40~50 m左右的第四系上更新统冲洪积下蜀粘土,隧道工程主要穿越该粘土层。该粘土层蒙脱石含量较高,测试结果为硬塑,中等膨胀性。膨胀土问题是工程建设中遇到的难题之一,对于膨胀土地层,由于膨胀土开挖卸荷和遇水膨胀的原因,应力-应变与普通土体不同,本文结合扬州瘦西湖明挖段基坑工程,对场区内几种不同形式的围护结构受力变形特点进行分析总结,分析了膨胀土地层部分对基坑围护结构受力变形的影响,为类似工程提供借鉴。
The Slender West Lake Tunnel in Yangzhou runs through Shugang - Slender West Lake Scenic Area, with a total length of 2.8 km. There are about 40 ~ 50 m of Quaternary Upper Pleistocene alluvial deposits below 10 m in the soil layer of the site, Through the clay layer. The clay montmorillonite content is higher, the test results for the hard plastic, moderate expansion. The problem of expansive soil is one of the problems encountered in engineering construction. For the expansive soil layer, due to the unloading of expansive soil and water expansion, the stress-strain is different from that of ordinary soil. Foundation pit project, the deformation and deformation characteristics of several different types of enveloping structures are analyzed and summarized, and the influence of some expansive soil strata on the stress and deformation of the retaining structure of foundation pit is analyzed, which can provide references for similar projects.