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(奧雅納工程顧問， 上海 200092)

摘要: 結(jié)合實(shí)際工程案例，采用三維有限單元法研究了既有嵌巖長(zhǎng)樁基礎(chǔ)之間增補(bǔ)非嵌巖短樁的作用機(jī)理及荷載分配規(guī)律。 采用 PLAXIS 3D 有限元軟件，首先分析了單根嵌巖長(zhǎng)樁的軸力隨深度變化情況，并與試樁靜載荷試驗(yàn)結(jié)果進(jìn)行對(duì)比。 在校驗(yàn)有限元模擬計(jì)算參數(shù)的合理性與準(zhǔn)確性之后，建立長(zhǎng)樁基礎(chǔ)和長(zhǎng)、短樁組合基礎(chǔ)有限元模型，分析長(zhǎng)樁基礎(chǔ)和長(zhǎng)、短樁組合基礎(chǔ)的軸力變化規(guī)律，進(jìn)一步探討了嵌巖長(zhǎng)樁與非嵌巖短樁之間的荷載分擔(dān)規(guī)律及調(diào)控方法。 研究表明，樁端嵌入深埋巖層中的鉆孔灌注樁在開展單樁靜載荷試驗(yàn)時(shí)呈現(xiàn)出摩擦樁性狀，但在群樁共同作用時(shí)則凸顯出端承樁性狀。 在嵌巖長(zhǎng)樁之間增補(bǔ)非嵌巖短樁，能夠有效減小長(zhǎng)樁上部的軸力，但長(zhǎng)樁中下部的軸力并未減小。 長(zhǎng)樁與短樁之間的荷載分配關(guān)系取決于二者剛度比值，根據(jù)實(shí)際需求確定長(zhǎng)、短樁剛度比的目標(biāo)區(qū)間并采取適當(dāng)措施對(duì)長(zhǎng)、短樁剛度比進(jìn)行調(diào)節(jié)是長(zhǎng)、短樁組合基礎(chǔ)設(shè)計(jì)的關(guān)鍵。

關(guān)鍵詞: 嵌巖樁； 增補(bǔ)非嵌巖短樁； 長(zhǎng)、短樁組合； 樁剛度

中圖分類號(hào):TU318. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002￣848X(2022)02￣0022￣06

DOI:10. 19701 / j.jzjg.ZJ210061

Action mechanism and loads distribution rule of supplementing non￣rock￣socketed short piles between rock￣socketed piles

WANG Mingmin， LIU Pan， WANG Yao， ZOU Jinlin， ZHONG Congming

(Arup， Shanghai 200092， China)

Abstract: The action mechanism and load distribution rule of adding non￣rock￣socketed short piles between existingrock￣socketed piles were studied by using three￣dimensional finite element method in combination with an actual engineeringcase. Using PLAXIS 3D finite element software， the variation of axial force along depth of single long rock￣socketed pilewas analyzed and compared with static load test results of trial piles. After checking the rationality and accuracy of finiteelement simulation calculation parameters， the finite element models of long￣pile foundation and long￣short pile compositefoundation were established， and the variation rule of axial force of long￣pile foundation and long￣short pile compositefoundation were analyzed， and the loads distribution rule and control method between rock￣socketed long pile andnon￣rock￣socketed short pile were further discussed. The research shows that the bored cast￣in￣place pile with its toeembedded in deep buried rock presents the behavior of friction pile in the single pile static loading test but shows thebehavior of end bearing pile in pile groups. Adding non￣rock￣socketed short piles between rock￣socketed long piles caneffectively reduce the axial force on the upper part of long piles， but the axial force on the middle and lower part of longpiles is not reduced. The load distribution relationship between long and short piles depends on the ratio of pile stiffness. Itis the key for the design of long￣short pile composite foundation that the determining the target range of stiffness ratio of longpiles to short piles according to actual requirements and taking appropriate measures to adjust the stiffness ratio of long pilesto short piles.

Keywords: rock￣socketed pile； supplementary non￣rock￣socketed short pile； combination of long￣short composite pile；pile stiffness

第一作者:王明珉，博士，高級(jí)工程師，注冊(cè)土木工程師(巖土)，主要從事地基基礎(chǔ)、基坑支護(hù)工程咨詢和研究，Email:cquwmm@ 163.com。

[引用本文] 王明珉，劉攀，王垚，等. 嵌巖群樁基礎(chǔ)間增補(bǔ)非嵌巖短樁的作用機(jī)理及荷載分配規(guī)律[ J]. 建筑結(jié)構(gòu)，2022，52(2):22￣27. WANG Mingmin， LIU Pan， WANG Yao， et al. Action mechanism and loads distribution rule ofsupplementing non￣rock￣socketed short piles between rock socketed piles[J]. Building Structure，2022，52(2):22￣27.