本文選題：支護壓力 + 注漿壓力�。� 參考：《巖土工程學報》2016年09期

【摘要】：盾構隧道施工鄰近橋梁樁基已成為目前研究的熱點問題。針對盾構施工參數(shù)取值在工程中的應用價值,利用三維彈塑性有限元分析了樁基引起地層的豎向附加應力,反推出了Geedes式中的樁端阻力、樁側阻力分擔樁頂荷載的比例系數(shù)與樁長的數(shù)學表達式,并將Geedes豎向附加應力影響范圍與Randolph提出的影響半徑對比分析后,給出了樁基影響區(qū)域和非影響區(qū)域的界定半徑;基于支護壓力、注漿壓力的理論取值范圍及單位長度上土體損失量等于沉降槽面積的條件,利用三維彈塑性有限元進行計算分析,給出了支護壓力、注漿壓力在樁基非影響區(qū)域內的建議取值和土體損失的計算表達式;基于樁基非影響區(qū)域內盾構施工參數(shù)的建議取值及樁基對地層產(chǎn)生的附加應力,給出了樁基影響區(qū)域內盾構施工參數(shù)建議取值的數(shù)學表達式。研究結果表明:工作面的土壓力阻力選取工作面靜止土壓力合力,注漿壓力選取1.1倍的隧道埋深處水土壓力時,對地層的擾動較小。
[Abstract]:The construction of shield tunnel adjacent bridge pile foundation has become a hot issue. In view of the application value of shield construction parameters in engineering, the vertical additional stress caused by pile foundation is analyzed by using three-dimensional elastic-plastic finite element method, and the pile tip resistance in Geedes formula is deduced. The mathematical expression of the proportion coefficient and pile length of pile top load shared by pile side resistance is given. After comparing the influence range of Geedes vertical additional stress with the influence radius proposed by Randolph, the defining radius of influence area and non-influence area of pile foundation is given. Based on the theoretical range of support pressure, grouting pressure and the condition that soil loss is equal to settlement slot area in unit length, the support pressure is calculated and analyzed by using three-dimensional elastic-plastic finite element method. The proposed value of grouting pressure in the unaffected area of pile foundation and the calculation expression of soil loss, based on the recommended values of shield construction parameters and the additional stress generated by pile foundation on the ground, The mathematical expression of the suggested value of shield construction parameters in the zone affected by pile foundation is given. The results show that the earth pressure resistance of the working face is determined by the combination of static earth pressure in the working face, and when the grouting pressure is 1.1 times the soil and water pressure at the buried depth of the tunnel, the disturbance to the formation is relatively small.
【作者單位】： 北京交通大學土木建筑工程學院;中國土木工程集團有限公司;中國新興保信建設總公司;北京城建設計發(fā)展集團有限公司;
【分類號】：U455.43

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