“逆作法”基坑豎向支承系統(tǒng)設(shè)計研究
楊學(xué)林，周平槐
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楊學(xué)林，周平槐（浙江省建筑設(shè)計研究院， 杭州 310006）［摘要］“逆作法”基坑在逆作施工期間，由于基礎(chǔ)底板（或承臺）尚未封底，地下室墻、柱等豎向構(gòu)件的傳力路徑尚未形成，逆作施工期間的結(jié)構(gòu)自重及施工荷載均由豎向支承系統(tǒng)承擔，因此，豎向支承系統(tǒng)的設(shè)計是基坑“逆作法”設(shè)計的關(guān)鍵環(huán)節(jié)之一。結(jié)合杭州西湖凱悅大酒店、杭州中國絲綢城、杭州地鐵1號線武林廣場站、紹興好望大廈等逆作法基坑工程，歸納了豎向支承系統(tǒng)的常見形式，總結(jié)了豎向支承柱的垂直度校正技術(shù)。采用彈簧單元模擬豎向立柱周圍土體的側(cè)向約束作用，同時計入下部混凝土立柱樁的約束作用，通過壓桿臨界荷載的歐拉公式反算豎向立柱的計算長度系數(shù)，并進一步分析了周邊土體值、插入深度和支撐梁剛度等因素對豎向立柱計算長度系數(shù)和穩(wěn)定承載力的影響。［關(guān)鍵詞］逆作法;豎向支撐系統(tǒng);豎向立柱;垂直度;周邊土體;彈簧單元;計算長度系數(shù);穩(wěn)定承載力中圖分類號：TU 941文獻標識碼：A文章編號：1002-848X(2012)08-0099-05Study on design for the vertical supporting systems of foundation pit using top-down methodYang Xuelin, Zhou Pinghuai(Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China)Abstract: In the process of construction of foundation pit using top-down method, all of the structure weight and construction loading are supported by vertical supporting systems, because the construction of the pile cap and foundation floor have not been completed, and the path of conduct force of the vertical structural component such as the walls and columns in the basement has not yet formed. So the design of the vertical supporting systems is a key step. With the background of Hangzhou,such as the Hangzhou Westlake Hyatt Hotel, Hangzhou Chinese Silk City, and Wulin Square stop of Hangzhou Metro Line No. 1, etc, the most common form of the vertical supporting systems and the verticality control of erect columns are summarized. By using spring element to calculate the effect of soil lateral resistance, the effective length coefficient of erect supporting column is analyzed through the Euler′s formula for critical load of compression bar. The factors to influence the effective length coefficient and stable bearing capacity of erect columns are analyzed, including the effect of lateral soil, embed depth, and the stiffness of sustain to column.Keywords: top-down construction method; vertical supporting systems; erect columns; verticality; lateral soil; spring element; effective length coefficient; stable bearing capacity作者簡介：楊學(xué)林，工學(xué)博士，教授級高級工程師，總工程師，Email: yangxuelin@ziad.cn。參考文獻［1］孫訓(xùn)芳,方孝淑，關(guān)來泰，等.材料力學(xué)［M］.北京:高等教育出版社,1994.［2］趙明華,汪優(yōu),黃靚.基樁屈曲的幾何非線性有限元分析［J］.巖土力學(xué),2005,26(增刊):184-188.［3］J10036—2000 建筑基坑工程技術(shù)規(guī)程（浙江省標準）［S］.杭州:浙江省標準設(shè)計站,2000.［4］王新敏.ANSYS工程結(jié)構(gòu)數(shù)值分析［M］.北京:人民交通出版社,2007.［5］楊學(xué)林，周平槐. 逆作地下室設(shè)計中的若干關(guān)鍵問題［J］.巖土工程學(xué)報，2010，32（S1）：238-244.第42卷 第8期2012年8月建筑結(jié)構(gòu)Building StructureVol.42 No.8Aug. 2012
