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(上海泰江置業(yè)發(fā)展有限公司201206)

［提要］雙排樁支護(hù)結(jié)構(gòu)是基坑圍護(hù)結(jié)構(gòu)的一種形式，但目前的分析方法無(wú)法考慮其與土體的共同作用。采用平面應(yīng)變有限元方法研究了軟粘土地基基坑開(kāi)挖雙排樁支護(hù)結(jié)構(gòu)的性狀，重點(diǎn)分析了樁土界面特性、前后排樁間距等因素對(duì)支護(hù)結(jié)構(gòu)的內(nèi)力和變形的影響。分析表明，當(dāng)雙排樁排距過(guò)小時(shí)，圍護(hù)結(jié)構(gòu)類似于懸臂式單排樁性質(zhì)；當(dāng)排距過(guò)大時(shí)，后排樁對(duì)前排樁起到類似拉錨樁的作用；只有當(dāng)排間距為4d左右時(shí)，雙排樁圍護(hù)結(jié)構(gòu)才能達(dá)到最好的效果。

［關(guān)鍵詞］基坑開(kāi)挖  支護(hù)結(jié)構(gòu)  雙排樁  有限元

Numerical Analysis on Deep Excavation Supported by Structure of Double row Piles in Soft Clay/Lin Limin(Shanghai Taijiang Estate Development Co. Ltd., Shanghai 201206, China)

Abstract:Double row pile is one type of bracing structure of foundation pit, but it can’t be taken into consideration for the interaction between pile and soil by existing analytical method. With plain strain finite element method, the characteristic of double-row pile of excavation of foundation pit in soil clay is studied. It is emphasized on the influencing factors on the stress and displacement of bracing structure, the characteristic of interface of pile-soil and the spacing between two rows of pile. It is presented that the bracing structure of double row pile is as the cantilever one row pile while the spacing of two rows is too close. While when the spacing of two rows is too large, the back pile is just as the anchor pile for the front pile. The double-row pile is the most effective as a bracing structure while the spacing of two piles is about 4d.

Keywords:excavation of foundation pit; bracing structure; double-row pile; finite element