本文關(guān)鍵詞： 偏壓基坑 開(kāi)挖深度 數(shù)值模擬 空間效應(yīng)　出處：《東南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2016年04期 　論文類(lèi)型：期刊論文

【摘要】：采用考慮基坑分層開(kāi)挖與支護(hù)的三維有限元計(jì)算模型,研究偏壓非等深基坑的開(kāi)挖效應(yīng),并評(píng)價(jià)基坑支護(hù)結(jié)構(gòu)設(shè)計(jì)參數(shù)的合理性.分析結(jié)果表明:偏壓荷載下,基坑上部一定深度內(nèi)的圍護(hù)墻和內(nèi)支撐發(fā)生向非偏壓側(cè)的整體偏移,進(jìn)而使得基坑上部支撐的撓度遠(yuǎn)小于中下部支撐.地下3層開(kāi)挖引起的墻體向坑內(nèi)側(cè)移量是地下2層開(kāi)挖引起的側(cè)移量的3倍,且最大側(cè)移均發(fā)生在各自坑底標(biāo)高附近.坑底隆起和地表沉降表現(xiàn)出明顯的空間效應(yīng),地下3層開(kāi)挖引起坑底最大隆起值約為地下2層開(kāi)挖引起坑底最大隆起值的2倍.基坑中間斷面外側(cè)地表最大沉降約為基坑角點(diǎn)處地表最大沉降的1.4倍.本工程采用的基坑支護(hù)體系設(shè)計(jì)參數(shù)可滿足變形控制要求.
[Abstract]:The three-dimensional finite element model considering the layered excavation and supporting of foundation pit is used to study the excavation effect of non-equal-pressure deep foundation pit, and the rationality of the design parameters of foundation pit support structure is evaluated. In the upper part of the foundation pit, the retaining wall and the inner support deviate to the unbiased side of the retaining wall at a certain depth. The deflection of the upper support of the foundation pit is much smaller than that of the middle and lower part of the foundation pit, and the displacement of the wall to the inside of the pit caused by the excavation of the three layers underground is three times the amount of the lateral displacement caused by the excavation of the second layer of the foundation pit. The maximum lateral displacement occurred near the elevation of each pit bottom, and the uplift of the pit bottom and the surface subsidence showed obvious spatial effects. The maximum uplift of the pit bottom caused by the excavation of the three layers is about 2 times of the maximum uplift value of the bottom caused by the excavation of the second floor, and the maximum settlement of the surface outside the middle section of the foundation pit is about 1.4 times of the maximum settlement at the corner of the foundation pit. The design parameters of foundation pit support system can meet the requirements of deformation control.
【作者單位】： 東南大學(xué)交通學(xué)院;安徽建筑大學(xué)建筑健康監(jiān)測(cè)與災(zāi)害預(yù)防技術(shù)國(guó)家地方聯(lián)合工程實(shí)驗(yàn)室;東南大學(xué)江蘇省城市地下工程與環(huán)境安全重點(diǎn)實(shí)驗(yàn)室;
【基金】：“十二五”國(guó)家科技支撐計(jì)劃資助項(xiàng)目(2012BAJ01B02) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)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(duì)象資助項(xiàng)目
【分類(lèi)號(hào)】：TU753

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