Test Study on the Stress and Deformation Behaviors of a Shaft Supported by a Prefabricated Prestressed Structure

Guoqing Zhao; Suyun Meng; Chengli Guan; Yuyou Yang

doi:10.3390/app9040629

Test Study on the Stress and Deformation Behaviors of a Shaft Supported by a Prefabricated Prestressed Structure

Applied Sciences ◽

10.3390/app9040629 ◽

2019 ◽

Vol 9 (4) ◽

pp. 629 ◽

Cited By ~ 1

Author(s):

Guoqing Zhao ◽

Suyun Meng ◽

Chengli Guan ◽

Yuyou Yang

Keyword(s):

Lateral Displacement ◽

Earth Pressure ◽

Steel Structure ◽

Soil Deformation ◽

Deformation Control ◽

Supporting Structure ◽

The Earth ◽

Test Study ◽

Deformation Behaviors ◽

Stress And Deformation

Soil deformation control is the key to shaft support. To better control soil deformation, improve construction efficiency, and reduce pollution, this study proposed a prefabricated prestressed supporting structure. The structure consisted of prefabricated steel structure units and special prestressed components. The structure units were applied to retain the soil. The screws were used for prestressing. Field prototype tests were conducted to assess the support effects and analyze the stress and deformation behaviors of the shaft. The earth pressure, the stress in the structure unit, and the lateral displacement of the soil were monitored. The measured earth pressure varied between the earth pressure at rest and the passive earth pressure. The stress of the supporting structure was far less than the yield strength of steel. Changes in the earth pressure and structural stress can be divided into four stages: rapid attenuation, fluctuation, slow change, and stabilization. Both the earth pressure and the structure stress completed the major attenuation within three days of prestressing. The surrounding soil moved out from the shaft under prestress conditions and exhibited an obvious space-time effect. The study of stress and deformation provides guidance for the construction of newly prefabricated prestressed structures.

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Study on the applicability of a retaining wall using batter piles in clay

Canadian Geotechnical Journal ◽

10.1139/cgj-2014-0264 ◽

2016 ◽

Vol 53 (8) ◽

pp. 1195-1212 ◽

Cited By ~ 4

Author(s):

Minsu Seo ◽

Jong-Chul Im ◽

Changyoung Kim ◽

Jae-Won Yoo

Keyword(s):

Lateral Displacement ◽

Retaining Wall ◽

Earth Pressure ◽

Integrated System ◽

Element Analysis ◽

Test Execution ◽

The Earth ◽

National University ◽

Clay Ground ◽

Batter Piles

A retaining wall using batter piles has been developed and studied to improve existing earth-retaining structures at Pusan National University. The earth-retaining method is a temporary excavation method using an integrated system of front supports and batter piles. The batter piles connected to the front supports significantly reduce the earth pressure acting on the front supports by distributing it to batter piles to increase structural stability. In this study, the existence of batter piles, the fixity of the tips of front supports or batter piles, the spacing between batter piles, and the verticality of front supports are varied across model tests. The lateral displacement of the earth-retaining wall decreased by approximately 40% and 15% for the existence and fixity of batter piles, respectively. The applicability of the earth-retaining method using batter piles has been verified with finite element analysis and field test execution in clay ground.

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Optimization and Mechanical Characteristics of Spatial Arc Antislide Pile

Advances in Civil Engineering ◽

10.1155/2021/6508675 ◽

2021 ◽

Vol 2021 ◽

pp. 1-18

Author(s):

You-Sheng Deng ◽

Cheng-Pu Peng ◽

Jun-Cong Liu ◽

Ling-Tao Li ◽

Yun-Bo Fu

Keyword(s):

Stress State ◽

Mechanical Characteristics ◽

Earth Pressure ◽

Bending Moment ◽

Test Results ◽

Safety Factors ◽

Supporting Structure ◽

The Earth ◽

Practical Engineering ◽

Simulation Results

To improve the stress state of traditional antislide pile and utilize the stable soil on both sides of a landslide and slope foot, a spatial arc antislide pile supporting structure was proposed. Based on numerical calculation, a parametric study was conducted to assess the influence of the rise-span ratio on the stress state of the supporting structure, the displacement of the pile top, and the earth pressure in the front of the pile. The optimal rise-span ratio was 3-16 according to the numerical simulation results. An indoor model test at the optimal rise-span ratio was carried out, recording the pile strain and the earth pressure in front of the pile. The results showed that some indices increased with the increase in rise-span ratio, such as the load transferred to the pile at the arch foot, the bending moment of the piles, the displacement of the pile top, and the earth pressure; within a certain depth near the pile top, the soil in front of the pile is loose during the loading processes, and the earth pressure at the range was zero. The overall safety factors of the four supporting models were 2.42, 2.66, 2.78, and 2.84, respectively, which can satisfy the requirements for practical engineering. The test results verify the feasibility and rationality of the spatial arc antislide pile supporting structure, which can provide a new idea for landslide treatment.

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Study of Seismic Design Method for Slope Supporting Structure of Soil Nailing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.2073 ◽

2013 ◽

Vol 353-356 ◽

pp. 2073-2078

Author(s):

Tian Zhong Ma ◽

Yan Peng Zhu ◽

Chun Jing Lai ◽

De Ju Meng

Keyword(s):

Seismic Design ◽

Calculation Method ◽

Retaining Wall ◽

Earth Pressure ◽

Calculation Model ◽

Soil Nailing ◽

Case Record ◽

Analysis And Design ◽

Supporting Structure ◽

Earthquake Action

Slope anchorage structure of soil nail is a kind of economic and effective flexible slope supporting structure. This structure at present is widely used in China. The supporting structure belong to permanent slope anchorage structure, so the design must consider earthquake action. Its methods of dynamical analysis and seismic design can not be found for the time being. The seismic design theory and method of traditional rigidity retaining wall have not competent for this new type of flexible supporting structure analysis and design. Because the acceleration along the slope height has amplification effect under horizontal earthquake action, errors should be induced in calculating earthquake earth pressure using the constant acceleration along the slope height. Considering the linear change of the acceleration along the slope height and unstable soil with the fortification intensity the influence of the peak acceleration, the earthquake earth pressure calculation formula is deduced. The soil nailing slope anchorage structure seismic dynamic calculation model is established and the analytical solutions are obtained. The seismic design and calculation method are given. Finally this method is applied to a case record for illustration of its capability. The results show that soil nailing slope anchorage structure has good aseismic performance, the calculation method of soil nailing slope anchorage structure seismic design is simple, practical, effective. The calculation model provides theory basis for the soil nailing slope anchorage structure of seismic design. Key words: soil nailing; slope; earthquake action; seismic design;

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Coordinated optimization control of shield machine based on dynamic fuzzy neural network direct inverse control

Transactions of the Institute of Measurement and Control ◽

10.1177/0142331220980274 ◽

2020 ◽

pp. 014233122098027

Author(s):

Xuanyu Liu ◽

Wentao Wang ◽

Yudong Wang ◽

Cheng Shao ◽

Qiumei Cong

Keyword(s):

Fuzzy Neural Network ◽

Control Method ◽

Earth Pressure ◽

Screw Conveyor ◽

Inverse Control ◽

The Earth ◽

Coordinated Optimization ◽

Optimization Control ◽

Fuzzy Neural ◽

Shield Machine

During shield machine tunneling, the earth pressure in the sealed cabin must be kept balanced to ensure construction safety. As there is a strong nonlinear coupling relationship among the tunneling parameters, it is difficult to control the balance between the amount of soil entered and the amount discharged in the sealed cabin. So, the control effect of excavation face stability is poor. For this purpose, a coordinated optimization control method of shield machine based on dynamic fuzzy neural network (D-FNN) direct inverse control is proposed. The cutter head torque, advance speed, thrust, screw conveyor speed and earth pressure difference in the sealed cabin are selected as inputs, and the D-FNN control model of the control parameters is established, whose output are screw conveyor speed and advance speed at the next moment. The error reduction rate method is introduced to trim and identify the network structure to optimize the control model. On this basis, an optimal control system for earth pressure balance (EPB) of shield machine is established based on the direct inverse control method. The simulation results show that the method can optimize the control parameters coordinately according to the changes of the construction environment, effectively reduce the earth pressure fluctuations during shield tunneling, and can better control the stability of the excavation surface.

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Analytical solutions for the earth pressure of narrow cohesive backfill with retaining walls rotating about the top

Acta Geotechnica ◽

10.1007/s11440-021-01187-9 ◽

2021 ◽

Author(s):

Yu-jian Lin ◽

Fu-quan Chen ◽

Yan-ping Lv

Keyword(s):

Analytical Solutions ◽

Earth Pressure ◽

Retaining Walls ◽

The Earth

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The earth pressure behind full-height integral abutments

IABSE Symposium Report ◽

10.2749/222137805796271008 ◽

2005 ◽

Vol 90 (6) ◽

pp. 55-58 ◽

Cited By ~ 6

Author(s):

Ming Xu ◽

Alan G. Bloodworth

Keyword(s):

Earth Pressure ◽

The Earth ◽

Integral Abutments ◽

Full Height

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Experimental Study on Earth Pressure of Corrugated Steel Culvert under High Fill Embankment

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.1815 ◽

2013 ◽

Vol 405-408 ◽

pp. 1815-1819

Author(s):

Wen Sheng Yu ◽

Zhu Long Li ◽

Xiao Ru Xie ◽

Li Yuan Guo

Keyword(s):

Mechanical Property ◽

Experimental Study ◽

Reinforced Concrete ◽

Concrete Slab ◽

Earth Pressure ◽

Reinforced Concrete Slab ◽

The Earth ◽

Filling Height ◽

Test Points ◽

Better Than

To analyze the earth pressure of corrugated steel culvert under high fill embankment, a field test was taken and the change law was got with the filling height increasing, the force state when geotechnical grilles were laid on the top of corrugated steel culvert was compared to that of reinforced concrete slab culvert. Results show that the pressure on the top of corrugated steel culvert is smaller than that on the external in same level when test points are near to culvert, the values of test points above and below geotechnical grilles are close, and the pressure of corrugated steel culvert is smaller than that of reinforced concrete slab culvert when filling height is above 7.3 m. So analysis indicates corrugated steel culvert spreads the upper load better, the geotechnical grille can reduce the pressure effectively through earth pressure redistribution, and the mechanical property of corrugated steel culvert is better than reinforced concrete slab culvert under high fill embankment.

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