抗拔桩后注浆技术及其应用   总被引：1，自引：0，他引：1  

张武  高文生 《岩土工程技术》2008,22(1):31-35

介绍了抗拔桩后注浆技术的基本原理、实施方法、效果分析及承载力计算模式。通过工程实例说明抗拔桩后注浆技术能提高单桩抗拔承载力,降低施工难度和改善成桩质量,缩短工期,节省工程造价。  相似文献   

软土地基偏斜管桩检测及纠偏处理实例   总被引：1，自引：0，他引：1  

汪海滨 《安徽地质》2008,18(1):65-69

软土地基的PHC管桩若施工不当,较易出现偏斜和断裂的现象。本文通过工程案例分析了事故原因,介绍了偏斜管桩的检测方法和顶推纠偏法的施工方法和结果。处理后的桩基经检测承载力和结构完整性满足设计要求,证明了该施工方法的有效性,为类似工程提供了参考价值。  相似文献   

复合载体夯扩桩技术在河漫滩区的应用     

徐永利  陈素琪 《陕西地质》2008,26(2):87-90

复合载体夯扩桩是由干硬性混凝土及填充料等经细长锤夯扩形成的复合载体和钢筋混凝土桩身组成。它具有挤密地基及扩大桩端面积的双重作用。此技术以环境污染小（无泥浆）、节约资源且较经济（桩径小）,而得到较快的发展和应用。本文结合工程实际,对其在河漫滩地区的应用进行探讨,为今后在同类地区的设计和施工提供参考。  相似文献   

化学灌浆在贵州岩溶山区滑坡治理中的应用     

王中美  丁坚平  刘世喜 《中国地质灾害与防治学报》2008,19(1):40-44

随着公路建设规模的扩大,在贵州岩溶山区边坡及滑坡出现的数量越来越多,治理难度也越来越大。如何用一种经济、施工简便的方法解决贵州岩溶山区滑坡治理问题,成为贵州公路建设中亟待解决的一个重要课题。文章对化学灌浆法在贵州某高速公路滑坡治理中的运用进行试验探索,解决了地层能否灌浆处理;地层灌浆处理时,需要何种浆液材料;采用多大的压力,灌入多少浆液等问题。并在工程治理中选取75个孔做灌浆试验。根据试验确定了灌浆扩散半径、孔距、排距等参数。通过探井开挖试验、标准贯入试验、声波波速测试等检测方法进行灌浆治理效果的检测评价,从检测结论可知,该方法具有很好的效果。为了比较其经济性,还作了3种滑坡治理方案的经济技术对比。从对比结果可知,化学灌浆技术具有很强的经济优势。因此,该技术在岩溶山区的滑坡治理中有很好的适用性及应用前景。  相似文献   

塘口水电站坝基岩体透水性和渗漏问题分析     

桑红  李玉才  何练民  王现国 《地下水》2008,30(1):76-78

塘口水电站大坝基础座落在断层和裂隙较发育的龟裂纹灰岩上,岩体完整性差、透水性强,多年运行后,大坝灌浆廊道和排水廊道出现多处集中性漏水,为确保大坝安全和电站正常发电,根据渗漏性质和成因,采用对灌浆廊道补充帷幕灌浆,对排水廊道进行固结+帷幕+回填灌浆。通过灌浆处理后,效果良好,表明灌浆工程有效的将导致坝基渗漏的上下游的裂隙通道封闭,并顺利的经受了随后的汛期洪水考验,大坝安全得到保障。  相似文献   

Response evaluation for horizontally loaded fixed‐head pile groups using 3‐D non‐linear analysis     

Emilios M. Comodromos  Kyriazis D. Pitilakis 《国际地质力学数值与分析法杂志》2005,29(6):597-625

The response of laterally loaded pile foundations may be significantly important in the design of structures for such loads. A static horizontal pile load test is able to provide a load–deflection curve for a single free‐head pile, which significantly differs from that of a free‐ or fixed‐head pile group, depending on the particular group configuration. The aim of this paper is to evaluate the influence of the interaction between the piles of a group fixed in a rigid pile cap on both the lateral load capacity and the stiffness of the group. For this purpose, a parametric three‐dimensional non‐linear numerical analysis was carried out for different arrangements of pile groups. The response of the pile groups is compared to that of the single pile. The influence of the number of piles, the spacing and the deflection level to the group response is discussed. Furthermore, the contribution of the piles constituting the group to the total group resistance is examined. Finally, a relationship is proposed allowing a reasonable prediction of the response of fixed‐head pile groups at least for similar soil profile conditions. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

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