北京第三系岩层工程地质特性与高层建筑基桩承载性状试验分析
摘要:在北京市区西部，厚层第四纪卵砾石沉积层以下普遍分布有第三系岩层，此类岩土层性质极易受环境影响，具有遇水软化特征明显，崩解且耐久性差，浸水饱和单轴抗压强度低等特点。该地区的M、G项目选取第三纪岩层作为桩端持力层，试验桩数据表明桩侧阻力只有部分发挥，桩端阻力未发挥，分析原因是岩石工程特性变化及桩端沉渣过厚；侧阻力与端阻力并非各自独立，由于孔底支承刚度而存在着相互影响机制。基于对第三系岩层工程特性研究及M、G项目试验桩检测数据的分析，丽泽SOHO最终选取厚层第四纪卵石层为桩端持力层；通过试验桩检测数据的分析，表明此区域选择第四系卵石层作为桩端持力层更能有效地发挥桩侧及桩端阻力，并且避免了桩基施工对第三系岩层的扰动。后期工程检验桩检测数据也进一步验证基桩设计方案的合理性。
Abstract:In the western district of Beijing,Quaternary gravel sedimentary beneath widespread distribution of Tertiary strata,such this aquifer with nature vulnerable to environmental impact,which have characteristics of water softening obviously,poor disintegration durability and lower flooding saturated uniaxial compressive strength.M and G projects select the Tertiary strata as a pile tip bearing stratum;test data shows that the pile side resistance partly play,and pile tip resistance does not play,which due to the pile construction changes rock environment,and too thick sediment.At the same time,pile side resistance and pile tip resistance are not independent of each other,due to the hole bottom bearing stiffness support of there is a mutual impact mechanism.Based on the analysis of the characteristics of Tertiary strata and test pile data of the M and G projects,then Lize SOHO eventually choose thick layer of Quaternary gravel as pile bearing stratum;through analyzing Lize SOHO test pile data,which indicates that this region Quaternary gravel layer selected as pile bearing stratum could more effectively play pile side and pile tip resistance,then avoids pile construction disturbance to tertiary.The data of engineering pile test further validates that pile foundation pile design is reasonable.
中文标题：
北京第三系岩层工程地质特性与高层建筑基桩承载性状试验分析
Analysis of Pile Foundation Bearing Capacity for High-rise Building and Beijing Tertiary Strata Engineering Geology Characteristics
作者：
王媛,孙宏伟
Wang Yuan,Sun Hongwei
作者简介:王媛,女,1985年生,陕西延安人,硕士,工程师,主要从事地基基础设计及咨询分析。E-mail:lizzy13@163.com
通讯地址：
北京市建筑设计研究院有限公司, 北京 100045
BeijingInstituteofArchitecturalDesign,Beijing100045,China
中图分类号:TU443
doi:10.3969/j.issn.1007-2993.2018.01.003
出版物：岩土工程技术
收稿日期:2017-09-06
网络出版日期:2021-07-06
关键词:第三系岩层,桩筏基础,承载性状,载荷试验
Key words:tertiary strata,pile raft foundation,bearing capacity,load test
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