本文選題：基坑工程 + 小寬深比基坑　； 參考：《巖石力學(xué)與工程學(xué)報》2017年S1期

【摘要】：為了探究小寬深比基坑的變形特性,結(jié)合上海虹橋地區(qū)23個小寬深比基坑實測資料,在與普通基坑變形對比分析的基礎(chǔ)上,對不同形狀、不同支護形式的小寬深比基坑變形規(guī)律進行研究。結(jié)果表明:(1)小寬深比基坑圍護結(jié)構(gòu)最大側(cè)移值(δ_(hm))的平均值為0.16%H_e(H_e為基坑開挖深度),明顯小于普通基坑的δ_(hm);(2)小寬深比基坑圍護結(jié)構(gòu)最大側(cè)移點埋深(Hd)范圍為(H_e-6,H_e+6);(3)小寬深比基坑墻后最大地表沉降值(δ_(vm))的平均值為0.15%H_e,小于普通基坑的δ_(vm);(4)小寬深比基坑中井形基坑的δ_(hm)和δ_(vm)均小于狹長形基坑,表現(xiàn)出較強的變形控制能力;(5)小寬深比基坑的δ_(hm)和δ_(vm)與支護形式有關(guān),鋼板樁、SMW工法樁、鉆孔灌注樁對應(yīng)的變形依次減小;(6)小寬深比基坑墻后地表沉降呈梯形分布,其沉降影響范圍小于普通基坑;小寬深比基坑中狹長形基坑墻后地表沉降影響范圍大于井形基坑;(7)小寬深比基坑δ_(vm)/δ_(hm)的平均值為0.96,主要與土層性質(zhì)有關(guān)。
[Abstract]:In order to study the deformation characteristics of small width ratio foundation pit, combined with the measured data of 23 small width depth ratio foundation pit in Hongqiao area of Shanghai, on the basis of comparing and analyzing the deformation of common foundation pit, the different shapes of foundation pit are analyzed. The deformation law of foundation pit with small width to depth ratio of different support forms is studied. The results show that the average value of 0.16%H_e(H_e is the depth of foundation pit excavation, which is obviously smaller than that of ordinary foundation pit.) the maximum depth of lateral displacement of small width ratio is Hd) the range of He-6He-6He is 3) the average value of 0.16%H_e(H_e is the depth of foundation pit excavation, which is obviously smaller than that of ordinary foundation pit. The average value of the maximum surface settlement behind the depth ratio of foundation pit wall is 0.15He, which is smaller than that of the ordinary foundation pit (未 _ subgrade / VM ~ (4). The 未 _ (HM) and 未 _ (V _ (vm) of the well shaped foundation pit in the small width ratio are smaller than those of the narrow and long foundation pit. It is shown that the deformation control ability is strong. (5) the 未 substructure of the foundation pit with small width to depth ratio is related to the supporting form. The deformation corresponding to the steel plate pile and the bored pile is reduced in turn, and the deformation of the bored pile decreases in turn) the surface settlement of the foundation pit wall with the small width depth ratio presents a trapezoid distribution. The influence range of settlement is smaller than that of ordinary foundation pit, and the influence range of surface settlement behind the wall of long and narrow foundation pit with small aspect ratio is larger than that of well shaped foundation pit. The average value of 未 / 未 -span ratio is 0.96, which is mainly related to the properties of soil layer.
【作者單位】： 同濟大學(xué)地下建筑與工程系;同濟大學(xué)巖土及地下工程教育部重點實驗室;浙江省交通規(guī)劃設(shè)計研究院;
【基金】：浙江省交通運輸廳科研計劃項目(2014H06) 國家自然科學(xué)基金資助項目(40972214)~~
【分類號】：TU433
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本文編號：1931297