Analysis of Locking Value of Anchor Cable in Pile Anchor Supporting Structure

2013 ◽  
Vol 838-841 ◽  
pp. 203-208
Author(s):  
Jie Chen ◽  
Dong Wang ◽  
Chun Lei Feng
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Anchor Cable ◽  
The North ◽  
Relaxation Loss ◽  
Geological Conditions ◽  
Treatment Measures ◽  
The Stability

This paper analyses the problem of locking value of anchor cable of pile anchor supporting of a deep foundation pit in the north of Kunming city. There are many influencing factors of locking value of anchor cable such as relaxation loss of anchor cable materials, tensioning system, pre-stress loss caused by anchorage friction, geological conditions and so on. And the author put forward the corresponding treatment measures for achieving the stability of supporting structure.

Research of Controlling for Pile-Anchor Joint Supporting Structure on Deformation of Deep Foundation Pits

2011 ◽  
Vol 261-263 ◽  
pp. 1809-1813
Author(s):  
Jin Biao Chen ◽  
Qiang Hu ◽  
Yuan Wu Zhou
Keyword(s):  
Soil Properties ◽  
Deformation Mechanism ◽  
Geotechnical Engineering ◽  
Reliability Theory ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Foundation Deformation ◽  
The Stability

The excavation of deep foundation pit is very complex in the field of geotechnical engineering, how to control the deformation of deep foundation pit and protect the environment is of great significance. This paper analyzed the deformation mechanism of pile-anchor joint supporting structure in detail, established a model for deformation controlling based on the reliability theory, and then analyzed the sensitivities of prestressed, pile stiffness, spacing and soil properties to foundation deformation. Combined with an engineering example, this paper verifies the stability and effectiveness of the model for deformation controlling. This study will provide some reference to similar projects.

Monitoring and Analysis on the Supporting Structure for Deep Foundation Pit

2014 ◽  
Vol 580-583 ◽  
pp. 787-790
Author(s):  
Hai Xia Sun ◽  
Ke Zhang ◽  
Si Li Chen
Keyword(s):  
In Situ Monitoring ◽  
Monitoring Data ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Metro Station ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Deformation Features ◽  
The Stability

This article mainly expounds the importance of in-situ monitoring on the construction process of deep foundation pit. Taking the deep foundation pit of some Shenyang metro station for example, the deformation features of the supporting structure and the internal and external of foundation pit is analyzed, according to the monitoring data of the fender pile displacement during the excavation of deep foundation pit. The conclusion is obtained that the timely and accurate in-situ monitoring information is necessary to guaranteeing construction safety. We should pay more attention to the excavation speed and exert the interior support timely during the excavation of foundation pit to avoid large deformation and danger. The analytical results of monitoring data shows that the whole stage of foundation pit excavation is stable and the fender pile with internal supports can guarantee the stability of foundation pit.

scholarly journals Displacement Monitoring during the Excavation and Support of Deep Foundation Pit in Complex Environment

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Zhouqiang Li
Keyword(s):  
Axial Force ◽  
Time History ◽  
Horizontal Displacement ◽  
Underground Water ◽  
Surface Settlement ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Anchor Cable ◽  
The North

Taking a super large deep foundation pit project as an example, the horizontal displacement of crown beam and driveway, surface settlement, axial force of anchor cable, and underground water level in the construction process of the foundation pit are dynamically monitored and analyzed. The excavation deformation rule of the deep foundation pit and the influence of excavation on surrounding buildings are analyzed. The results show that, with the excavation of the foundation pit, the crown beam and driveway of the foundation pit incline towards the direction of the pit and eventually tend to be stable. The variation of axial force of the prestressed anchor cable in the first layer of the foundation pit is basically consistent with the variation of horizontal displacement time history. The variation trend of the groundwater level at each side of the foundation pit is different but tends to be stable in a short time. In the whole monitoring period, the cumulative settlement value of each area of the foundation pit is within the controllable range, but the surface settlement of the north side of the foundation pit and a surrounding building has not reached stability, so it is suggested to extend the monitoring time of settlement in the relevant area.

Application of Anchoring Concrete Filling Piles in Deep Foundation Pit Engineering at Zhengzhou North Freight Marshalling Station

2013 ◽  
Vol 438-439 ◽  
pp. 1423-1426
Author(s):  
Xin Zhong Zhang ◽  
Yong Jun Cheng ◽  
Ke Dong Tang
Keyword(s):  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Railway Line ◽  
Anchor Cable ◽  
The North ◽  
Bored Piles ◽  
Marshalling Station ◽  
Concrete Filling ◽  
Construction Practice

This paper introduces the "Levels of anchor cable +Bored piles +Net shotcrete combined support plans application in deep foundation pit engineering at Zhengzhou north freight marshalling station. Construction practice and monitoring data show that the engineering supporting design and construction have got an ideal effect, to ensure the safety of the north Ring Bridge and the railway line. It has a certain guiding significance to similar municipal engineering.

Simulating Effect of Anchor Cable Pre-Tension to Supporting Structure

2013 ◽  
Vol 788 ◽  
pp. 525-529
Author(s):  
Tao Wang ◽  
Ren Wang Liang
Keyword(s):  
Bending Moment ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Cost Performance ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Anchor Cable ◽  
Steel Strand ◽  
The Impact ◽  
Free Section

Since the pre-stressed anchor technology became to be used from the beginning of twentieth century, it is widely used with the advantages of its good applicability, high cost performance, good looking appearance and easy green. Pre-stressed anchor achieves the purpose of actively controlling foundation pit deformation by exerting pre-stress on steel strand of its free section. This thesis chooses deep foundation pit engineering, adopt Mohr-Coulomb ideal soil body by finite difference software FLAC3D, and select different anchor pre-tension values to simulate. It combines Lizheng software to do numerical simulation and analytic study on pile-anchor supporting structure. This thesis compares results coming from the two kinds of software, and analyze the impact on row piles' body bending moment, pile top deformation, anchor cable axial force and foundation pit deformation when pre-tension changes.

The Stability Analysis of Deep Foundation Pit Engineering Support and Field Testing Research

2011 ◽  
Vol 105-107 ◽  
pp. 1456-1459
Author(s):  
Xiang Dong Zhang ◽  
Zhi Liu ◽  
Xi Jun Liu
Keyword(s):  
Field Testing ◽  
Element Model ◽  
Transverse Displacement ◽  
Simulation Design ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Displacement Effect ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
The Stability

In order to study the foundation pit supporting structure displacement of the change rule and different parameters on the transverse displacement effect of pile. My research based on supporting structure engineering of Shenyang Washington. We use the software ADINA as a research tools to establish a finite element model. We simulated and analyzed the displacement with and without anchor. Results show that adding anchor supporting played a very good supporting effect, and the simulation results and actual test results compared and analyzed proved reasonable and simulation design scheme was feasible, this excavation has some guidance for the engineering and a certain reference for similar deep foundation pit bracing. [1]

Study on Measures to Retain the Deep Foundation Pit for Soil-Rock Composition with Weak Intercalated Layers

2013 ◽  
Vol 405-408 ◽  
pp. 373-377
Author(s):  
Jing Wang ◽  
Feng Ming Sun ◽  
Jin You Chen ◽  
Chang Jie Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Balance Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Rock Composition ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Geological Conditions ◽  
The Stability

Aiming at a deep foundation pit in soil-rock composition with weak intercalated layers, in this paper, using the limit-balance method and finite element method to analyze the stability and deformation. The safety factor of foundation pit under the absence of retaining is much less than 1 through the limit-balance method, but through some retaining measures can guarantee its safety. According to the excavation of the foundation pit in special geological conditions, it takes pile-anchor retaining structure in upper and soil nailing in the lower part. Using the finite element to carry out dynamic simulation for the whole project, the results show that: this form of retaining can be very good to ensure the excavation of the foundation pit in the geological conditions, and it may be helpful for similar projects

Research on the United Supporting Structure of Piled Anchor and Reinforced Concrete Internal Bracing for City Deep Foundation Pit under Complex Surroundings

2011 ◽  
Vol 261-263 ◽  
pp. 1270-1276
Author(s):  
Jing You Hu ◽  
Jian Bin Xie ◽  
Wei Li ◽  
Cheng Hui Li
Keyword(s):  
Reinforced Concrete ◽  
Underground Space ◽  
Construction Process ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Study Results ◽  
Internal Bracing ◽  
The Stability

In this paper, according to the hydrogeology and the surrounding of a 20 meters depth city deep foundation pit which has complex surrounding, the united supporting structure of piled anchor and reinforced concrete internal bracing for this foundation pit was proposed based on the reality that some underground space in surrounding of the foundation pit can not be used. Then according to the possible construction process for foundation pit, the stability of the united supporting structure was calculated and analyzed based on the characteristics of piled anchor and internal bracing. And a case project to support a deep foundation pit by using the united supporting structure of piled anchor and reinforced concrete internal bracing was introduced subsequently. The study results show that the 20 meters depth city deep foundation pit stabilizes integrally when the foundation pit is supported by the united supporting structure. The results also show that settlement of the pit’s surrounding shallow ground is very small, and water-stop curtain of this pit has good performance on piping resistance. It is also certified that the united supporting structure of piled anchor and reinforced concrete internal bracing can meet to the operating requirements of underground space in surrounding.

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