- 摘 要
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（連云港市建筑設(shè)計研究院有限責(zé)任公司，連云港 222001）
［摘要］連云港海相軟土具有含水量高、壓縮性高、孔隙比高、強度低及高觸變性等特點，其工程性質(zhì)較差。鑒于軟土的特殊性，該地區(qū)廣泛應(yīng)用管樁作為基坑擋土結(jié)構(gòu)。工程實踐證明，管樁應(yīng)用于基坑支護(hù)工程是安全可行的，尤其適應(yīng)于深度為4～8m的基坑。工程實測表明，管樁支護(hù)體系的變形特性與灌注樁相似，內(nèi)支撐的設(shè)置時間及場地土體特性是影響深層土體位移的主要因素；對于軟土場地基坑，盡早設(shè)置水平支撐體系可以顯著減小支護(hù)體系的變形；監(jiān)測結(jié)果驗證了管樁在該地區(qū)支護(hù)工程中的可行性與適用性。
［關(guān)鍵詞］海相軟土；基坑開挖；預(yù)應(yīng)力管樁；現(xiàn)場監(jiān)測；水平位移
Application and observational analysis of pipe-pile for excavation support system in Lianyungang district
He Yongfu, Zhu Jinjun(Lianyungang Architectural Design & Research Institute Co.,Ltd., Lianyungang 222001, China)
Abstract:Owing to its high-water content, high compression, high void ratio, low bearing capacity and high thixotropic property, the marine soft soil makes a lot of difficulties in foundation pit support system in Lianyungang district. Because of these particularities of the soft soil, the pipe pile has been widely used as retaining structure in this district. It has been demonstrated by engineering experience that application of the pipe-pile in excavation support system is feasible and reliable, especially for the excavation of 4～8 meters in depth. According to monitoring data, the deformation characteristic of the pipe-pile is similar to the compresol pile, the time of installing bracing system and the soil property are the main factors which affect the deformation characteristic of pit. To reduce the deformation of pit in soft soil site, it is an effective method to install the bracing system as soon as possible. Finally, the monitoring data validates the feasibility and applicability of the pipe pile in excavation support system in Lianyungang district.
Keywords:marine soft soil; foundation excavation; prestressed pipe-pile; on-site monitoring; horizontal displacement
作者簡介：何永福，工程師，Email:Heyongfu@yeah.net。
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