高速鐵路載體樁復(fù)合地基沉降計算方法探討*
陳洪運，馬建林，胡中波，楊彥鑫
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（西南交通大學(xué)土木工程學(xué)院， 成都 610031）［摘要］針對高速鐵路中載體樁復(fù)合地基的受力特點，分別采用Boussinesq法和Mindlin法對載體樁復(fù)合地基下臥層的附加應(yīng)力進行計算和對比分析，結(jié)果表明采用Mindlin法計算得到的載體樁復(fù)合地基的附加應(yīng)力比采用Boussinesq法所得的附加應(yīng)力小。并采用與土層深度有關(guān)的天然狀態(tài)下的壓縮模量修正公式對下臥層的壓縮模量進行修正，計算了壓縮模量修正前后的地基沉降量，將計算結(jié)果與實測結(jié)果進行對比分析，結(jié)果表明：采用壓縮模量修正后Mindlin法計算高速鐵路載體樁復(fù)合地基的沉降，所獲得的計算結(jié)果與實測結(jié)果較為接近，該法對高速鐵路中載體樁復(fù)合地基加固后的沉降計算具有一定的參考價值。［關(guān)鍵詞］載體樁; Mindlin法; Boussinesq法; 壓縮模量修正; 沉降中圖分類號：TU473 文獻標識碼：A 文章編號：1002-848X(2013)24-0076-04Discussion on settlement calculation method of composite ground using ram-compacted piles with bearing base in high speed railwayChen Hongyun, Ma Jianlin, Hu Zhongbo, Yang Yanxin(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)Abstract: According to the mechanical properties of ram-compacted piles with bearing base（RPBB）composite ground in high speed railway, Boussinesq method and Mindlin method were adopted to calculate and analyze the additional stress in the underlying layer of the composite ground. Results indicate that the additional stress calculated by using Mindlin method is smaller than that calculated by using Boussinesq method. The correction formula of compression modulus related with the depth of soil in the natural state was proposed for settlement calculation. The calculated settlement of composite ground before and after using the correction formula were compared, as well as with the measured settlement. The result shows that the calculation method of Mindlin method together with correction formula of compression modulus for RPBB composite ground in high speed railway can get a closer result comparing with the measured settlement, so the method has a certain reference value for the settlement calculation of RPBB composite ground in high speed railway.Keywords: ram-compacted piles with bearing base; Mindlin method; Boussinesq method; compression modulus correction; settlement*鐵道部京滬高速鐵路科技重大專項（2008G32-A）。作者簡介：陳洪運，博士研究生，Email：278709407@qq.com。參考文獻［1］龔曉南. 復(fù)合地基理論及工程應(yīng)用［M］. 2版. 北京: 中國建筑工業(yè)出版社, 2007.［2］閆寶杰，宋修廣，岳躍群. 粉噴樁復(fù)合地基附加應(yīng)力的Boussinesq-Mindlin聯(lián)合解法［J］. 巖土力學(xué)， 2007, 28(6): 1255-1258［3］MINDLIN R D. Force at a point in the interior of a semi-infinite solid［J］. Physics， 1936, 7(5): 195-202.［4］GEDDES J D. Stresses in foundation soils due to verical subsurface loading［J］. Geotechnique，1966, 16(2): 231-255.［5］張小平，俞仲泉. 用Mindlin解推求復(fù)合地基中附加應(yīng)力的計算公式［J］. 河海大學(xué)學(xué)報：自然科學(xué)版， 1999, 27(2): 35-39.［6］JGJ 135—2007 載體樁設(shè)計規(guī)程［S］. 北京: 中國建筑工業(yè)出版社, 2007.［7］徐志英. 以明特林(Mindlin)公式為根據(jù)的地基中垂直應(yīng)力的計算公式［J］. 土木工程學(xué)報，1957, 4(4): 485-497.［8］GB 50007—2011 建筑地基基礎(chǔ)設(shè)計規(guī)范［S］. 北京: 中國建筑工業(yè)出版社, 2012.
