基于塑性支承樁概念的復(fù)合樁基設(shè)計(jì)與探討
劉陸陽1，李應(yīng)保2
- 摘 要
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（1同濟(jì)大學(xué)，上海200092；2上海林同炎李國豪土建工程咨詢有限公司 200093）［提要］對于特大樁距的復(fù)合樁基，當(dāng)單樁為摩擦樁(或端承力較小的端承摩擦樁)時(shí)可認(rèn)為各樁的工作狀態(tài)將從彈性支承轉(zhuǎn)為完全塑性支承，即塑性支承樁。在滿足整體安全度的前提下，可令各單樁工作荷載接近或等于其極限荷載，其余荷載由地基土承擔(dān)，最終的沉降狀態(tài)由地基土的抗變形能力控制。介紹了基于此概念的復(fù)合樁基設(shè)計(jì)方法，對整體安全度及沉降驗(yàn)算等問題進(jìn)行探討，提出了改進(jìn)方法和設(shè)計(jì)建議，計(jì)算結(jié)果與工程實(shí)測數(shù)據(jù)比較吻合，在設(shè)計(jì)實(shí)踐中取得了很好的經(jīng)濟(jì)效益。［關(guān)鍵詞］塑性支承樁；復(fù)合樁基；安全度；沉降計(jì)算Design and Discussion of Composite Pile Foundation Based on Concept of Plastically Bearing Pile/Liu Luyang1，Li Yingbao2（1 Tongji University，Shanghai 200092，China；2 Lin Tongyan & Li Guohao Consultants Shanghai Ltd.，Shanghai 200093，China)Abstract:For the composite pile which has extremely large pile spacing, when single pile is a friction pile (or an end bearing friction pile having very small end bearing capacity), it can be considered that each pile"s working condition changes from elastic support to completely plastically support, namely plastically bearing pile. Under the degree of integrality safety, it can be assumed that each pile"s working stress can nearly reach or equal to ultimate load, and the rest load will be shared by soil. The final settlement is controlled by the anti-deformation characteristic of soil. The design method of composite pile based on this concept is introduced, and the degree of integrality safety and the settlement calculation are discussed. The improved method and design recommendation for the project are given, and the results meet the field experiment in engineering practice very well.The application to designing practice shows a good economical efficiency.Keywords:plastically bearing pile; composite pile foundation; degree of safety; settlement calculation
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