粉砂粉土地基钻孔咬合桩围护结构渗流及管涌分析
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摘要
深基坑工程的施工特点决定了其渗流场水力条件的复杂性,大量的工程实践显示,渗流问题是粉砂粉土地基中基坑工程事故的重要原因。钻孔咬合桩是一种新型围护结构型式,在深圳地铁一期工程、南京地铁1号线、天津地铁3号线、杭州地铁1#线秋涛路车站都得到了应用。在粉砂粉土地基中这种围护结构因两桩咬合不足而极易发生渗漏乃至管涌事故,因此研究粉砂粉土地基中钻孔咬合桩围护结构的渗流和管涌特性具有重要意义。
本文利用ABAQUS有限元软件,结合杭州地铁1#线秋涛路试验段工程对粉砂地基中钻孔咬合桩围护结构的降水渗流、渗漏、管涌问题展开了深入系统的研究,为粉砂地基深基坑开挖设计计算和工程实践提供技术支撑。
本文首先介绍了杭州地铁1#线秋涛路车站深基坑开挖工程,接着分析了其降水条件下的深基坑渗流问题,并模拟了咬合桩开叉发生渗漏条件下的深基坑渗流特性。随着开挖深度的增加,基坑渗流水力条件发生改变,渗漏逐渐发展为管涌,文中模拟了管涌发展的过程,及其对渗流场的影响。本文的工作表明,利用数值方法分析深基坑渗流及管涌特性,获得降水渗流和管涌对坑外水位和地表沉降的影响规律,对于深基坑工程的安全性评价和工程施工都具有重要的指导意义。
The properties of construction determine the complexity of hydraulic condition of deep foundation pit. Many engineering practices show that seepage is the important cause of foundation pit accident. Secant piles are new exterior-protected construction, SHENZHEN Metro first-stage construction, NANJING Metro Line 1、 TIANJIN Metro Line 3、 HANGZHOU Metro Line 1 all adopted secant piles exterior-protected construction. This retaining structure is easy to initiate piping as a result of secant piles bitten deficiently. However, the relevant theoretical study lags far behind the engineering practice, so it is an important research subject to study the properties of seepage and piping of secant piles exterior-protected construction in silt-sand soils.To provide technical supports for the design of deep foundation pit and the practice engineering, in this paper, the seepage、 leakage、 piping of deep foundation pit in silt-sand soils are systematically studied on the basis of ABAQUS.Firstly, HANGZHOU Metro Line 1 QIUTAO Road Station deep excavation engineering is introduced;Secondly, analyze and simulate seepage property of it as a result of dewatering and simulate leakage of secant piles due to bit deficiently;Finally, in the process of excavation, seepage field change gradually, leakage developed into piping. This paper also simulated the process of piping. This paper shows that it is important to construction and safety of deep foundation pit to simulate the property of seepage and piping and get the law of watertable and ground settlement by numerical method.
本文利用ABAQUS有限元软件,结合杭州地铁1#线秋涛路试验段工程对粉砂地基中钻孔咬合桩围护结构的降水渗流、渗漏、管涌问题展开了深入系统的研究,为粉砂地基深基坑开挖设计计算和工程实践提供技术支撑。
本文首先介绍了杭州地铁1#线秋涛路车站深基坑开挖工程,接着分析了其降水条件下的深基坑渗流问题,并模拟了咬合桩开叉发生渗漏条件下的深基坑渗流特性。随着开挖深度的增加,基坑渗流水力条件发生改变,渗漏逐渐发展为管涌,文中模拟了管涌发展的过程,及其对渗流场的影响。本文的工作表明,利用数值方法分析深基坑渗流及管涌特性,获得降水渗流和管涌对坑外水位和地表沉降的影响规律,对于深基坑工程的安全性评价和工程施工都具有重要的指导意义。
The properties of construction determine the complexity of hydraulic condition of deep foundation pit. Many engineering practices show that seepage is the important cause of foundation pit accident. Secant piles are new exterior-protected construction, SHENZHEN Metro first-stage construction, NANJING Metro Line 1、 TIANJIN Metro Line 3、 HANGZHOU Metro Line 1 all adopted secant piles exterior-protected construction. This retaining structure is easy to initiate piping as a result of secant piles bitten deficiently. However, the relevant theoretical study lags far behind the engineering practice, so it is an important research subject to study the properties of seepage and piping of secant piles exterior-protected construction in silt-sand soils.To provide technical supports for the design of deep foundation pit and the practice engineering, in this paper, the seepage、 leakage、 piping of deep foundation pit in silt-sand soils are systematically studied on the basis of ABAQUS.Firstly, HANGZHOU Metro Line 1 QIUTAO Road Station deep excavation engineering is introduced;Secondly, analyze and simulate seepage property of it as a result of dewatering and simulate leakage of secant piles due to bit deficiently;Finally, in the process of excavation, seepage field change gradually, leakage developed into piping. This paper also simulated the process of piping. This paper shows that it is important to construction and safety of deep foundation pit to simulate the property of seepage and piping and get the law of watertable and ground settlement by numerical method.
引文
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