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Method for evaluating influence of rectangular jacking pipe on adjacent pile foundation by considering influence of jacking torque

A technology of rectangular pipe jacking and evaluation methods, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as waste of resources, and achieve the effect of simple calculation and easy popularization and application

Pending Publication Date: 2021-08-24
CHINA TIESIJU CIVIL ENG GRP CO LTD +2
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  • Application Information

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Problems solved by technology

When some problems occur in a pipe jacking crossing project (in most cases, it is caused by inaccurate understanding of risks due to insufficient construction experience), it is easy to magnify the problem at this time and adopt wider and stricter reinforcement measures instead of starting from the top. Proceeding from the impact mechanism of the pipe on the stratum and adjacent pile foundations to discuss the impact of pipe jacking during jacking, resulting in a large waste of resources

Method used

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  • Method for evaluating influence of rectangular jacking pipe on adjacent pile foundation by considering influence of jacking torque
  • Method for evaluating influence of rectangular jacking pipe on adjacent pile foundation by considering influence of jacking torque
  • Method for evaluating influence of rectangular jacking pipe on adjacent pile foundation by considering influence of jacking torque

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Embodiment 1

[0046] The entrance and exit of a certain subway station are excavated using rectangular pipe jacking technology, and the plane size of the pipe jacking machine is 7.09m×4.10m. The pipe jacking strata are mainly silt and clay strata, the thickness of the overlying soil is 4.0m, the groundwater level is 1.0m below the ground, and the pressure at the center of the pipe jacking is estimated to be 80kPa. The pipe-jacking tunnel passes through the viaduct pile foundation sideways, with a minimum distance of 2.0m. The pile foundation of the elevated bridge is about 25m long and is made of C30 concrete.

[0047] The calculation process is mainly divided into two steps:

[0048] 1) According to Mindlin's solution, calculate the additional stress generated on the pile foundation during the pipe jacking process, such as figure 2 and image 3 shown;

[0049] 2) According to the elastic foundation beam theory, calculate the additional deformation on the pile foundation, such as Fig...

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Abstract

The invention relates to a method for evaluating the influence of a rectangular jacking pipe on an adjacent pile foundation by considering the influence of jacking torque, which comprises the following steps: firstly, finding out the distribution of stratums in a jacking pipe crossing range, the basic physical and mechanical properties of each stratum, the thickness of covering soil and the like, and calculating the jacking force of the jacking pipe; secondly, adopting Mindlin solution to solve additional stress in three spatial directions, caused by jacking force and torque in the jacking process of the jacking pipe, on a pile foundation through integration; thirdly, calculating additional deformation and additional internal force of the pile foundation under the action of additional stress according to an elastic foundation beam theory; and finally, evaluating the influence of pipe jacking on the pile foundation. The method has the advantages that the method for evaluating the jacking influence of the jacking pipe on the adjacent pile foundation is rapid and practical; the Mindlin solution is adopted to calculate the additional stress of jacking of the jacking pipe on the adjacent pile foundation, three-dimensional calculation analysis conducted through a complex finite element method is avoided, and a large amount of calculation time is saved; additional deformation and internal force of the adjacent pile foundation can be obtained by adopting the elastic foundation beam without complex calculation.

Description

technical field [0001] The invention relates to an evaluation method for the influence of rectangular pipe jacking on adjacent pile foundations considering the influence of jacking torque, and belongs to the technical field of underground engineering construction. Background technique [0002] The surrounding environment of modern urban underground engineering construction is becoming more and more complex. When encountering a large number of elevated bridge pile foundations, high-rise building pile foundations, subway tunnels, dozens of various underground pipelines, etc., it is inevitable that there will be problems that are approaching. How to quickly and effectively evaluate the impact of pipe jacking has become an important technical issue when there are problems with building (structure) foundations or pile foundations. How to evaluate the impact of pipe jacking in current projects mostly adopts numerical analysis methods such as finite element, which is not only time-...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/13G06F119/14
CPCG06F30/20G06F30/13G06F2119/14
Inventor 郑远松叶文龙钟小春李永运姚建文王子仪陈洁李猛袁奕昕李选兵倪小东何纯豪
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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