钻孔灌注桩的施工质量控制     

廖远淦 《南方国土资源》1999,12(3):67-70

该文通过对钻孔灌注桩的主要施工工艺如：泥浆比重及粘稠度、孔内沉渣厚度、钢筋笼的制安以及水下混凝土的灌注等工艺技术要求的控制方法的阐述，指出在钻孔灌注桩施工过程中只要对这些工序加强控制，就能确保钻孔灌注桩的质量  相似文献   

Seismic Response Analysis of Portal Water Injection Sheet Pile     

WANG Yuanbin  GUO Haiyan*  and ZHANG Chunhui College of Engineering  Ocean University of China  Qingdao  P. R.China 《中国海洋大学学报(英文版)》2007,6(1):90-94

1 Introduction The portal water injection sheet pile (PWISP) is a new type of space-retaining structure developed for the Shengli Oil Company. It was developed based on the combination of the practical needs of hydraulic projects and the technical principle of jet-drilling in the oil indus-try and has been successfully used for disaster prevention and hydraulic projects (Guo, 2002, 2005). It consists of the double-row parallel-prefabricated reinforced concrete sheet piles and the connectio…  相似文献   

Numerical modelling of compensation grouting above shallow tunnels     

C. Wisser  C. E. Augarde  H. J. Burd 《国际地质力学数值与分析法杂志》2005,29(5):443-471

This paper describes the development of a numerical model for compensation grouting which is a useful technique for the protection of surface structures from the potentially damaging movements arising from tunnel construction. Pipes are inserted into the ground between the tunnel and the overlaying structure from an access shaft. Buildings on the surface are instrumented and movements are carefully monitored. Once the deformations exceed a certain Trigger Level, grout is injected into the ground to prevent damage. In the finite element model described here, compensation grouting is modelled by applying an internal pressure to zero‐thickness interface elements embedded in the mesh. An ‘observational algorithm’ is used, where the deformations of the surface are monitored and used to control the injection process. Example analyses of compensation grouting are given for three‐dimensional tunnel construction underneath a greenfield site. Different strategies are used to control the injection process and their effectiveness in preventing surface movement is assessed. The numerical model is shown to replicate general behaviour expected in the field and is capable of modelling the control of ground surface movements at a greenfield site. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

某桩基事故分析谈桩型的合理选择     

廖远淦  杨锦全 《南方国土资源》2000,13(2):63-65

文章通过对某工程实例的分析,说明建筑物桩基形式的合理选择,必须综合考虑设计要求、场地工程地质、水文地质的具体情况以及施工设备、工艺的适应性,才能确保桩基工程质量并最终节约建筑成本.  相似文献   

海洋结构物小尺度桩柱的水动力系数研究与进展     

刘贵杰  王清扬  田晓洁  谢迎春 《中国海洋大学学报(自然科学版)》2020,(1):136-144

本文主要归纳了基于Morison方程求解小尺度桩柱的水动力系数方面的研究成果。分别从单桩柱和群桩两个方面对水动力系数的研究成果,包括纯波、波流混合、横向力、直立桩柱、倾斜桩柱、复杂结构桩柱、粗糙度等进行了阐述,给出了在波流条件下水动力系数的变化规律;归纳了当前水动力系数的求解方法;介绍了在水动力系数的物模实验、数值仿真以及实验数据处理方法上的研究进展,并提出了相关研究的建议。  相似文献   

注浆法在黄土地区公路路基洞穴处理中的应用     

李寻昌  门玉明  刘妮娜  刘英朴 《地球科学与环境学报》2004,26(1):38-40

研究了注浆法在黄土地区公路路基洞穴处理中的加固机理及技术指标.黄土地区公路中的洞穴对公路的安全运营常造成严重危害,同时对于这类洞穴的处理尚缺乏有效的方法.在大量调查和参考前人研究成果的基础上,将注浆法用于路基中洞穴的处理,提出了注浆法加固的主要设计参数,通过对施工现场黄土洞穴注浆处理效果分析,认为该方法具有良好的处理效果.  相似文献   

Numerical modelling of the driving response of thin‐walled open‐ended piles     

D. S. Liyanapathirana  A. J. Deeks  M. F. Randolph 《国际地质力学数值与分析法杂志》2001,25(9):933-953

The driving response of thin‐walled open‐ended piles is studied using numerical simulation of the wave propagation inside the soil plug and the pile. An elastic finite element analysis is carried out to identify the stress wave propagation in the vicinity of the pile toe. It is found that the shear stress wave has the highest magnitude above the bottom of the soil plug. Below the bottom of the soil plug, the vertical stress wave has the highest magnitude. Although the shear stress wave propagating in the radial direction is similar in magnitude to the vertical stress wave at the bottom of the soil plug, it decays rapidly while travelling downwards. The highest vertical stress at the bottom of the soil plug appears after the vertical stress wave interacts with the shear stress wave travelling in the radial direction. Initially, the vertical stress wave propagates with the dilation wave velocity in both the radial and vertical directions. After it interacts with the shear stress wave, the vertical stress wave starts to propagate with the shear wave velocity in the radial direction and with the axial wave velocity downwards. It is concluded that at the bottom of the soil plug, the interaction between the waves travelling in radial and vertical directions is important. The capabilities of several one‐dimensional pile‐in‐pile models to reproduce the driving response given by a two‐dimensional axisymmetric finite element model is studied. It is seen that when the base of the soil plug fails, a one‐dimensional pile‐in‐pile model can be used to achieve results in agreement with the finite element model. However, when the pile is unplugged, where the base of the soil plug does not fail, a reduced finite element mesh that permits the radial wave propagation inside the soil plug must be used. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

对101层上海环球金融中心桩筏基础性状的预测   总被引：2，自引：0，他引：2  

龚剑  赵锡宏 《岩土力学》2007,28(8):1695-1699

根据上海金茂大厦88层的成功建筑经验,试图预测101层上海环球金融中心桩筏基础性状,例如桩的承载力和及其随时间的增加、桩筏的荷载分担、筏厚、沉降和桩筏基础的设计理论等。最后,对两幢大楼桩筏基础性状加以评论,可供研究上海超高层建筑的超长桩基的设计理论的参考。  相似文献   

岩溶地区冲孔灌注桩的施工方法     

吴辰光 《中国煤田地质》2007,19(A01):63-64,73

以龙岩地区岩溶地带某一项目施工为例，分析冲孔灌注桩孔内漏浆、塌孔的原因，探讨在岩溶地区预防和处理塌孔的方法：改善泥浆品质，安放钢护筒，挤压黄土入裂隙，减小泥浆渗透，以及分层加入一定量水泥，使其形成水泥土护壁层。实践证明，诸类方法的使用可有效遏制孔内漏浆和塌孔，提高施工效率。  相似文献   

液化地层震动沉管桩施工对策     

赵以龙 《中国煤田地质》2007,19(A01):67-67,77

南京某综合办公楼桩基工程采用震动沉管桩，由于该区地层的粉砂层存在不同端阻力分界面，因上层长时间的震动，下层粉砂层发生液化，导致桩尖与沉管脱离，桩管内出现水泥浆：为此在施工中采用活瓣桩尖，并用0．5m^3的砼封底，有效地解决了桩管冒浆问题。  相似文献