摘要
在软土地区盾构施工过程中,盾构施工时多穿越城市地区,城市地区建筑物下的桩基分布众多,需要对施工中造成的地表沉降进行严格控制,Peck公式在盾构过程中对于周围沉降预测已被多数学者验证此公式在我国多数地区都有很好的适应性,如果使用Peck公式对于盾构沉降预测,就需要确定此公式中较为重要的一个参数地面沉降槽宽度系数i,但是在盾构施工中既有桩基对地面沉降槽宽度系数i有待研究。通过有限元数值模拟对不同的桩径(D)、桩间距(l)、桩长(H)情况下的i值进行拟合,并得到由H、l、D组成的i*和隧道间距(L)的线性公式,将得出的i*替换Peck公式中的i得到桩基影响下的Peck地表沉降预测公式,并通过杭州地铁2号线庆春广场站至三坝村站进行现场观测沉降并与桩基影响下的Peck地表沉降公式所得数值进行对比,证明了本公式的正确性与适用性。
In the process of shield construction in soft soil area,the shield construction through urban areas,urban areas many of the distribution of pile foundation under buildings caused by surface subsidence in the construction have to be strictly controlled,Peck formula in the process of shield settlement prediction has been around for most scholars to validate this formula has good adaptability in most areas in China,if you use the Peck formula for shield tunnel subsidence prediction,will need to make sure this is an important parameters in the formula of ground settlement trough width coefficient of i,but in the shield construction existing pile foundation on the ground settlement trough width coefficient i need to be researched.In this paper,i values of different pile diameter(D),pile spacing(l)and pile length(H)were fitted by finite element numerical simulation,and linear formulas of I*and tunnel spacing(l)composed of H,l and D were obtained.Peck surface settlement prediction formula affected by pile foundation was obtained by replacing i in Peck formula with i in i*,and field settlement observation was conducted from qingchun square station to sanbacun station of hangzhou metro line 2,and compared with Peck surface settlement formula affected by pile foundation,which proved the correctness and applicability of this formula.
作者
蒲韡
吕润东
陈启功
王哲
Pu Wei;Lv Rundong;Chen Qigong;Wang Zhe(Hangzhou Underground Space Construction and Development Center,Hangzhou 310002,China;Zhejiang University of Technology,Hangzhou 310023,China;Hanjia Design Co.,LTD.Hangzhou 310011,China)
出处
《科技通报》
2020年第7期63-69,93,共8页
Bulletin of Science and Technology
基金
国家自然科学基金项目(51778585)。
关键词
软土地区
盾构隧道施工
沉降槽宽度系数
桩基
现场实测
soft soil area
shield tunnel construction
width coefficient of settling tank
pile foundations
field measurement
