【摘要】：為克服現(xiàn)行規(guī)范建議采用單參數(shù)m法的缺點,將分析水平推力樁的綜合剛度原理和雙參數(shù)法延伸至作用有水平分布荷載的基坑內(nèi)撐式支護(hù)結(jié)構(gòu)變形和內(nèi)力計算中,建立一種基于此原理和方法的改進(jìn)的彈性地基梁有限差分算法。此外,為考慮動態(tài)施工過程,引入增量法對各工況進(jìn)行計算分析,并根據(jù)現(xiàn)場實測數(shù)據(jù),反演出合適的綜合剛度和雙參數(shù)。計算結(jié)果表明,該方法得到的水平位移和彎矩,均與實測結(jié)果吻合良好,而采用單參數(shù)m法卻很難使支護(hù)結(jié)構(gòu)的位移和內(nèi)力同時較好地與實測值相符。反分析所得的綜合剛度和地基抗力雙參數(shù),可應(yīng)用于同一基坑工程相同結(jié)構(gòu)或同一地區(qū)工程地質(zhì)條件和支護(hù)結(jié)構(gòu)相似的設(shè)計計算,無疑可獲得較現(xiàn)行單參數(shù)法更為準(zhǔn)確的設(shè)計計算結(jié)果。
[Abstract]:In order to overcome the shortcoming of single parameter m method, the principle of comprehensive stiffness of horizontal thrust pile and the method of two parameters are extended to the calculation of deformation and internal force of braced supporting structure of foundation pit with horizontal distributed load. An improved finite difference algorithm for elastic foundation beams based on this principle and method is established. In addition, in order to consider the dynamic construction process, the incremental method is introduced to calculate and analyze the working conditions, and according to the field measured data, the appropriate comprehensive stiffness and double parameters are obtained. The calculation results show that the horizontal displacement and bending moment obtained by this method are in good agreement with the measured results, but it is difficult to make the displacement and internal force of the supporting structure agree well with the measured values by using the single parameter m method. The comprehensive stiffness and the double parameters of foundation resistance obtained by inverse analysis can be applied to the design and calculation of the same structure of the same foundation pit or similar engineering geological conditions and supporting structures in the same area. No doubt, more accurate design results than the current single parameter method can be obtained.
【作者單位】： 福州大學(xué)巖土工程研究所;天津市天友建筑設(shè)計股份有限公司;
【分類號】：TU473
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本文編號：2289063