Design optimization of the soil nail wall-retaining pile-anchor cable supporting system in a large-scale deep foundation pit

2021 ◽  
Author(s):  
Lulu Liu ◽  
Ruigang Wu ◽  
Surya Sarat Chandra Congress ◽  
Qinwen Du ◽  
Guojun Cai ◽  
...  
Keyword(s):  
Design Optimization ◽  
Large Scale ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting System ◽  
Soil Nail ◽  
Anchor Cable ◽  
Soil Nail Wall

On Overloading Design Method for the Slope of Deep Foundation Pit with Layered Soil Braced by Soil Nail

2013 ◽  
Vol 438-439 ◽  
pp. 724-727
Author(s):  
Li Hua Li
Keyword(s):  
Design Method ◽  
Limit Equilibrium ◽  
Work Rate ◽  
Layered Soil ◽  
Plastic Limit ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Soil Nail ◽  
Limit Equilibrium Theory

Based on plastic limit equilibrium theory of soil, the suitable values of energy safety factor are discussed here from energy work rate, the new design method for vertical slope of deep foundation pit with layered soil braced by soil nail with even overloading on slope top is proposed and engineering example is given out.

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.

scholarly journals Numerical Simulation of Soil Displacement and Settlement in Deep Foundation Pit Excavations Near Water

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Zhongjing Hu ◽  
Qingbiao Wang ◽  
Shuo Yang ◽  
Zhenyue Shi ◽  
Bo Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Yellow River ◽  
Soft Soil ◽  
Ground Surface ◽  
Horizontal Displacement ◽  
Simulation Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit

Advancing urbanization in China requires large-scale high-rise construction and underground transportation projects. Consequently, there is an increasing number of deep foundation pits adjacent to water bodies, and accidents occur frequently. This study uses a numerical simulation method to study the stability of the deep foundation pit near water based on the Biot three-dimensional seepage-stress coupling model, with the open-cut section on the south bank of the Jinan Yellow River Tunnel Project as the engineering field test. This indicates the following: (1) the maximum horizontal displacement of the diaphragm wall occurred in the fifth excavation stage, and a horizontal brace effectively controlled the inward horizontal displacement of the foundation pit; (2) considering the effect of seepage in the soft soil foundation, the maximum vertical displacement of the ground surface at each excavation stage occurred adjacent to the underground continuous wall. As the depth of the foundation pit increased, the vertical surface settlement decreases gradually in the direction away from the excavation face; (3) considering the seepage conditions, within each interval of excavation of the foundation pit, the horizontal displacement of the continuous underground wall and ground settlement declined; and (4) the numerical simulation and field monitoring data were in good agreement. Under the conditions of accurate model simplification and parameter selection, numerical simulations can adequately forecast conditions of the actual project.

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.

The Supporting Scheme Selection of Deep Foundation Pit Based on Fuzzy Optimization Theory

2014 ◽  
Vol 541-542 ◽  
pp. 1492-1496
Author(s):  
Zi Sheng Yang ◽  
Ji Xiao Tao ◽  
Hong Ke Pan ◽  
Yong Tao Li
Keyword(s):  
Fuzzy Optimization ◽  
Optimization Theory ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting System ◽  
Simplified Method ◽  
Scheme Selection ◽  
System Selection ◽  
Selection Of

In order to get a quantitative and simple supporting scheme of deep foundation pit, this paper creatively develop a simplified method of supporting system selection based on the fuzzy optimization theory. The simplified method determines a preferred equation of the supporting system at first. Then the best solution is selected based on the preferred equation. Based on the simplified method, the analysis of the foundation excavation for Chuangye Dasha in Taiyuan has been performed. The result of the analysis shows that the method is reasonable and scientific.

Application of Prestressed Anchor Composite Soil Nail Wall in Deep Foundation Pit Engineering at Lanzhou Region

2014 ◽  
Vol 1030-1032 ◽  
pp. 714-718
Author(s):  
Hui Tao
Keyword(s):  
Soil Layer ◽  
Horizontal Displacement ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Soil Nails ◽  
Change Rate ◽  
Deep Foundation Pit ◽  
Soil Nail ◽  
Support Engineering ◽  
Prestressed Anchor

The paper introduces the application of prestressed anchors and soil nails support system in complex soil layer deep foundation pit engineering at Lanzhou region based on the deep foundation pit engineering in Gansu Provincial Hospital of TCM as the background and discusses its key technology. The effect shows that scheme of the design of foundation pit support engineering is reasonable and effective.The engineering meets requirements of design and environment.The monitoring results show that prestressed anchors can control the horizontal displacement and the change rate of slope′s vertical settlement effectively. The experience of engineering is significance for similar engineerings at Lanzhou region.

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.

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