發(fā)布時(shí)間：2018-06-01 04:39

  本文選題：螺旋擠土灌注樁 + 分布式光纖��； 參考：《中南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年03期

【摘要】：為了研究螺旋擠土灌注樁(SDS樁)的荷載傳遞規(guī)律及承載特性,將基于布里淵光時(shí)域分析(BOTDA)原理的光纖傳感技術(shù)用于螺旋擠土灌注樁樁基檢測,在某工地進(jìn)行現(xiàn)場試驗(yàn),測得試樁加載過程中的樁身應(yīng)變,進(jìn)而得出樁身軸力、樁側(cè)摩阻力及樁端阻力,并與同一場地內(nèi)長螺旋灌注樁(CFA樁)的測試結(jié)果進(jìn)行對比分析。研究結(jié)果表明:分布式光纖測量可以方便地獲取樁體的荷載傳遞規(guī)律;同一樁頂荷載等級下,SDS樁樁端阻力比CFA樁的小,達(dá)到極限荷載時(shí),樁端阻力約占總荷載的8%,設(shè)計(jì)時(shí)SDS樁可按摩擦樁或端承摩擦樁考慮;相同樁體參數(shù)和地層條件下,與CFA樁相比,SDS樁的極限承載力提高了約67%,相同樁頂荷載作用下,樁體沉降也比CFA樁的小;SDS樁成樁過程中通過樁周土體的物理擠密和應(yīng)力狀態(tài)的改變促進(jìn)了側(cè)摩阻力的大幅提高,從而承載力得到顯著提升。
[Abstract]:In order to study the load transfer law and load bearing characteristics of spiral compaction pile (SDS pile), the optical fiber sensing technology based on Brillouin optical time domain analysis (BOTDA) principle was used to detect the pile foundation of spiral soil compaction pile, and the field test was carried out at a site. The strain of the pile during loading is measured, and then the axial force, friction and tip resistance of the pile are obtained, and the results are compared with those of the CFA pile with long spiral cast-in-place pile in the same site. The results show that the load transfer law of pile body can be easily obtained by distributed optical fiber measurement, and the resistance at the end of CFA pile is smaller than that of CFA pile under the same pile top load grade. The resistance at the end of the pile is about 8% of the total load. In design, the SDS pile can be considered according to the friction pile or the end bearing friction pile, and the ultimate bearing capacity of the CFA pile is increased by about 67 when compared with the CFA pile under the same pile body parameters and stratum conditions, and under the same pile top load, The settlement of the pile also promotes the increase of the lateral friction greatly through the change of the physical compaction and stress state of the soil around the pile during the forming process of the small CFA pile, thus the bearing capacity is improved significantly.
【作者單位】： 東南大學(xué)巖土工程研究所;江蘇省城市地下工程與環(huán)境安全重點(diǎn)實(shí)驗(yàn)室;建筑健康監(jiān)測與災(zāi)害預(yù)防技術(shù)國家地方聯(lián)合工程實(shí)驗(yàn)室;安徽省建筑科學(xué)研究設(shè)計(jì)院;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2242014R30020) 江蘇省高�！扒嗨{(lán)工程”優(yōu)秀青年骨干教師培養(yǎng)對象資助項(xiàng)目(2014)~~
【分類號】：TU473.1

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