CAJ | 학술논문

<建筑地基处理技术规范>分别给出含有折减系数α的单桩承载力计算公式和含有系数β的复合地基承载力计算公式,为了得到适用于本地区的α和β的取值范围,为今后规范的修订提供参考数据,对珠三角地区有代表性的淤泥质土地基采用水泥土搅拌桩进行加固处理,进行单桩、天然地基以及设置4种厚度褥垫层的水泥土搅拌桩四桩复合地基的静载荷试验.通过对试验数据的分析和反算,对规范给出的承载力计算公式中折减系数a和b的取值范围进行修正,给出详细的取值建议.同时分析褥垫层厚度对复合地基承载力的影响,并建议褥垫层厚度取200～400 mm,为珠三角地区水泥土搅拌桩复合地基的设计提供参考.
<건축지기처리기술규범>분별급출함유절감계수α적단장승재력계산공식화함유계수β적복합지기승재력계산공식,위료득도괄용우본지구적α화β적취치범위,위금후규범적수정제공삼고수거,대주삼각지구유대표성적어니질토지기채용수니토교반장진행가고처리,진행단장、천연지기이급설치4충후도욕점층적수니토교반장사장복합지기적정재하시험.통과대시험수거적분석화반산,대규범급출적승재력계산공식중절감계수a화b적취치범위진행수정,급출상세적취치건의.동시분석욕점층후도대복합지기승재력적영향,병건의욕점층후도취200～400 mm,위주삼각지구수니토교반장복합지기적설계제공삼고.
The calculational formula for bearing capacity of single pile with coefficient α and bearing capacity of composite foundation with coefficient β are shown in Technical Code for Construction Foundation Treatment. In order to get the value scopes of α and β which are suitable for this region and provide revision data for future code revision,the reinforcement treatment of representative silt soil foundation is carried out by means of cement-soil mixing pile in the Pearl River Delta area. And then,the load test is performed on single pile,natural foundation and four cement-soil mixing piles composite foundation,which is set with four kinds of thickness cushions. Based on analysis and calculation of the test data,the value ranges of the reduction coefficient α and β in the bearing capacity formula in the code are modified. Finally,the influence of cushion thickness on the bearing capacity of composite foundation is analyzed. It is suggested that the value range of cushion thickness is 200-400 mm,which can provide reference for design of cement-soil mixing pile composite foundation in the Pearl River Delta area.