桩底压浆桩的承载力较之普通灌注桩有显著提高；
The bearing capacity of base-grouted pile can be significantly improved in comparison with that of bored pile;
论证了通过灌浆加固桩底使桩满足承载力要求的可行性。
The feasibility of making the pile meet the request of bearing capacity by grouting in the pile bottom is discussed.
同时，桩底沉渣清除的干净与否，也直接影响超长桩的沉降。
In addition, the settlement of super-long piles is closely associated with the compressibility of the sediment at pile end.
在能够获得桩底反射的前提下，脉冲宽度和敲击速度尽量小。
The pulse width and impact velocity as small as possible on the premise that can obtain reflection from the pile toe.
同时对灌注桩桩底沉渣对桩端荷载传递函数的影响进行了考虑。
And the influence of slime present beneath a bored pile base on load-transfer function for pile base is considered.
根据本工程实例情况，人工挖孔桩桩底标贯试验是非常必要的。
The standard penetration test(SPT)of base-pile of the artificial bored pile is very essential according to the feature of this project.
阐明了对桩底沉渣区灌浆体低强度(相对桩身强度)要求的概念。
The idea on low strength request (relative to the strength of the pile shaft) to grouted body in sedimentary region at the pile bottom is clarified.
然后根据奇异点位置确定入射波、缺陷反射波、桩底反射波位置。
Then, the positions of the incident wave, pile-toe reflection wave and flaw reflection wave can be determined by the position of singular point.
最后确定桩底后压浆扩展半径的影响因素，并对其进行模拟分析。
The enlarged radius, stress of ending soil and area of compaction zone are also discussed.
由信号的奇异点位置很容易确定入射波、缺陷反射波、桩底反射波位置。
Then the incident wave, pile-toe reflection wave and flaw reflection wave can be judged by the position of singularity.
介绍帕克西桥钻孔桩基础桩底压浆的施工，包括材料、设备及施工工艺。
This paper presents the construction process of pile base grouting for bored pile foundations of Paksey Bridge, in which the selected materials, equipment and construction technology are covered.
用低应变法检测嵌岩桩，若桩底出现明显同相反射，多数因桩底缺陷引起。
Testing bearing pile with low strain method will be some defects in the bottom if the echo from the tip has the same phase as the pulse at the top.
对压密灌浆法用于桩底灌浆提高钻孔灌注桩承载力的工艺和机理进行了探讨。
Technology and mechanism of compaction grouting used in bored pile base grouting to enhance the bearing capacity are discussed.
用压力灌浆法处理钢筋混凝土灌注桩底以提高灌注桩的竖向承载力是一项新工艺。
Using pressure grouting to treat concrete reinforcement filling pile's bottom to increase the vertical bearing capacity of filling pile is a new technique.
结合杭州利群大厦工程实例，介绍了桩底后压浆技术的特点、施工工艺和质量控制。
Combining with the Hangzhou Liqun Building project, authors introduce some aspects of the pile-bottom post-grouting technology such as features, construction methods and quality control.
在桩底灌浆预制桩承载性能的研究基础上，进一步研究桩底灌浆钻孔灌注桩的承载性能。
Based on research on the behavior of precasted pile and grouted at pile bottom, the behavior of boring pile grouted at pile bottom is studied further.
本文通过工程实例阐述了桩底注浆的工作原理和工艺流程，指出了桩底注浆技术的发展前景。
Here the function mechanism and the technology process of grouting after pile driving technology are explained by engineering examples and the development prospect is pointed out.
其次，引入有限差分法与双参数法，考虑桩底的几种约束情况，推导了锚索桩内力与位移计算方法。
Secondly, by the finite difference method and two-parameter method, this study derives the calculation on the inter force and displacement of the anchor piles.
泥浆护壁钻孔灌注桩当桩端持力层为砂土层等非岩石层时，通过桩底压密灌浆能有效地提高单桩承载力。
When the bearing stratum at the tip of bored pile is sandy soil stratum, the method of pile tip pressure grouting can effectively improve the bearing capacity of single piles.
由于灌注桩桩底虚土难以清理干净，致使端阻不能充分发挥，对灌注桩极限承载力及沉降产生较大影响。
Because of the virtual earth under the pile ending hard to clean, the ending bearing is seldom worked sufficiently, which leads to ultimate bearing capacity and settlement problems.
通过对三根桩的静载试验，研究了桩底压力注浆的效果，并对压力注浆提高桩承载力的机理进行了分析。
The paper mainly states the treatment methods and effects of adopting pressure casting technique to stop the seepage of the water supply structure.
实测结果表明，桩底后注浆处理后，持力层的端阻力提高约100%，刚性桩复合地基承载力提高约35%。
Loading test results indicate that the bottom resistance increases by about 100% after grouting in the pile bottom, and the bearing capacity of the rigid pile increases by about 35%.
为了消除桩底沉渣和桩侧泥膜的影响，对灌注桩进行桩端注浆、桩侧注浆或桩端桩侧联合注浆是一种较好的方法。
In order to eliminate the bad influence caused by the mud in the end and side of piles, some kinds of methods, such as end grouting, side grouting and end-side association grouting, could be used.
通过对工程实例的剖析，介绍桩底后注浆和扩大承台(梁)法等桩基事故处理方法和原理，作为工程实践经验的总结。
Through the analysis of pile bottom grouting and beam expanding accident methods and principles, the engineering practical examples are summarized.
灌注桩后压浆技术解决了桩底沉淤和桩身泥皮影响灌注桩承载力的问题，使桩底、桩侧土得到了加固，从而大幅度提高了灌注桩的承载力，降低了桩的沉降量。
Problem on the bearing capacity of cast-in-place pile influenced by the deposit at pile end and the mud hanged on pile shaft can be solved by the technique with the post grouting.
采用高精度滑动测微计测试AM扩底桩在各级荷载下的桩身应变，测试精度高，测试结果可靠。
The pile strain of AM bulb cast-in-place pile is tested by high precision sliding micrometer, which can have high precision and reliable testing results.
人工挖孔扩底灌注桩是高层建筑常用的一种桩基础形式，其施工质量的好坏直接影响到建筑的结构安全。
Usually the poured pile by artificial excavation expanding bottom is one foundation pile style of tall building, whose quality can affect the structural safety of the construction directly.
文中提出的承载力取值和沉降计算是一套适合于我国大直径扩底桩的设计方法。
The way to value the bearing capacity and settlement calculation given herein are fit for the design of large diameter belled pile in China.
文中提出的承载力取值和沉降计算是一套适合于我国大直径扩底桩的设计方法。
The way to value the bearing capacity and settlement calculation given herein are fit for the design of large diameter belled pile in China.
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