本文選題：隧道工程　切入點(diǎn)：等效基床系數(shù)　出處：《巖石力學(xué)與工程學(xué)報(bào)》2014年S1期

【摘要】：基床系數(shù)是利用荷載 結(jié)構(gòu)法求解工程問題的關(guān)鍵。為研究具有變異性成層土地基的等效基床系數(shù)的分布特征及統(tǒng)計(jì)參數(shù),基于最終沉降量一致原理推導(dǎo)以壓縮模量為參數(shù)的等效基床系數(shù)計(jì)算方法,利用Monte Carlo方法考慮地層的變異性。在此基礎(chǔ)上,借助Matlab軟件實(shí)現(xiàn)求解,并將計(jì)算結(jié)果應(yīng)用于港珠澳沉管隧道工程中,建立基于荷載 結(jié)構(gòu)法的二維分析模型。主要得到如下結(jié)論:(1)典型斷面K9+843處的等效基床系數(shù)近似符合正態(tài)分布,均值為985 kPa/m,變異系數(shù)為0.265;(2)考慮地基變異性得到的沉降量近似符合對(duì)數(shù)正態(tài)分布,且差異顯著;(3)斷面沉降量與地層 結(jié)構(gòu)法三維有限元模型計(jì)算結(jié)果接近,證明上述計(jì)算方法是合理的。
[Abstract]:In order to study the distribution characteristics and statistical parameters of equivalent bed coefficients in layered soils with variability, the coefficient of foundation is the key to solve the engineering problems by using the load-structure method. Based on the consistent principle of final settlement, the equivalent bed coefficient calculation method with compression modulus as the parameter is derived, and the variation of stratum is considered by Monte Carlo method. On this basis, the solution is realized by means of Matlab software. The calculation results are applied to the engineering of Hong Kong-Zhuhai-Macao immersed tube tunnel, and a two-dimensional analysis model based on the load-bearing structure method is established. The main conclusions are as follows: 1) the equivalent bed coefficient at K9843 of typical cross section approximately accords with normal distribution. The mean value is 985 KPA / m, and the coefficient of variation is 0.265 / 2) the settlement obtained by taking into account the variation of the ground is approximately in accordance with the logarithmic normal distribution, and the difference is significant (3)) the settlement of the section is close to that of the 3-D finite element model of the stratigraphic structure method. It is proved that the above calculation method is reasonable.
【作者單位】： 同濟(jì)大學(xué)地下建筑與工程系;同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室;河海大學(xué)水利水電學(xué)院;中交公路規(guī)劃設(shè)計(jì)院有限公司;港珠澳大橋管理局;
【基金】：上海市科委課題(12231201000) 港珠澳大橋島隧工程沉管隧道接頭張開位移量控制技術(shù)研究(20122451)
【分類號(hào)】：U455.46;U452.11

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