Test and numerical research on wall deflections induced by pre-excavation dewatering

Zheng, Gang; Zeng, Chao-Feng; Diao, Yu; Xue, Xin

doi:10.1016/j.compgeo.2014.08.005

Cited by 50 publications

(9 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…erefore, GRA was introduced to analyze the correlation between each support variable and the maximum horizontal deflection of the retaining wall. In many monitoring projects, the maximum horizontal displacement of the retaining wall was selected as the reference factor, as it was the most important indicator reflecting the structural stability of the foundation pit [32,33].…”

Section: Grey Relational Analysis (Gra) Of the Influencing Factors Of...mentioning

confidence: 99%

“…ird, considering the maximum horizontal deflection of the retaining wall as an important inspection index [32,33], the influence of different factors on the maximum horizontal deflection of the retaining wall was discussed based on the numerical model. Finally, the degree of influence of each factor on the maximum horizontal deflection of the retaining wall was analyzed by grey correlation analysis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deformation Characteristics of the Foundation Pit of the Underpass Viaduct and Grey Relational Analysis of the Maximum Horizontal Deflection of the Retaining Wall

Sun

Yan

Cao

et al. 2022

Mathematical Problems in Engineering

View full text Add to dashboard Cite

With the rapid development of rail transit, the excavation of new foundation pits will inevitably approach or pass through existing structures. Therefore, choosing a reasonable support scheme can effectively control the deformation of the foundation pit and ensure the safety of existing structures. This paper investigates the excavation of a typical foundation pit in Guangdong that underpasses a viaduct as the research object. This study uses field monitoring and numerical simulations to analyze the deformation characteristics of the supporting structure and introduces grey relational analysis (GRA) to investigate the key factors that influence the maximum horizontal deflection of the retaining wall. The results indicate that all monitored values are substantially less than the warning value specified in the code. Moreover, the horizontal deflection of the retaining wall and the horizontal displacement of the top of the wall at the measuring points near the existing bridge piles are smaller than at other measuring points. This support system has a high safety factor and a large space for optimization. The main factors affecting the maximum horizontal deflection of the retaining wall are as follows: second strut horizontal spacing > first strut horizontal spacing > layered excavation thickness > retaining wall thickness > retaining wall stiffness. The results of this study will provide technical guidance for the design of similar projects and optimization of their construction.

show abstract

Section: Grey Relational Analysis (Gra) Of the Influencing Factors Of...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation Characteristics of the Foundation Pit of the Underpass Viaduct and Grey Relational Analysis of the Maximum Horizontal Deflection of the Retaining Wall

Sun

Yan

Cao

et al. 2022

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…The preexcavation pumping test is an effective method to check the reliability of the dewatering scheme and the quality of the diaphragm wall [27]. Therefore, the preexcavation pumping test was conducted after the construction of diaphragm wall.…”

Section: Preexcavation Pumping Testmentioning

confidence: 99%

Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

et al. 2021

View full text Add to dashboard Cite

This paper reports the dewatering scheme of a deep excavation in sandy pebble strata. The excavation is in high permeability strata and is close to the Yellow River, making the dewatering difficult during construction. At present, few researchers have specially studied the dewatering scheme of deep excavations in strong permeable strata near the water resource. Field pumping test was conducted before the excavation activity, and the permeability coefficient of the strata was obtained by reverse analysis. According to the characteristics of the project, the dewatering scheme of “ waterproof curtain + base grouting + pumping ” was proposed. The influence of vertical waterproof curtain and base grouting on dewatering was analyzed by numerical simulation. In the construction process, the field water table and ground settlement were measured. The results show that (1) the groundwater table versus permeability coefficient curve shows three different stages and (2) the dewatering scheme of “ waterproof curtain + base grouting + pumping ” is effective for deep excavation in strong permeable strata.

show abstract

“…However, regardless of many advantages of dewatering for protecting excavations, it has been widely accepted that groundwater extraction can induce stratum deformation in the vicinity of the excavations [5,7,8,18,19,[29][30][31][32][33] as well as secondary hazards to surrounding structures [34][35][36][37]. Many scholars and engineers have been devoted to investigating the dewatering-induced environment influence in Shanghai.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer

Zhang

et al. 2019

JMSE

View full text Add to dashboard Cite

The coastal micro-confined aquifer (MCA) in Shanghai is characterized by shallow burial depth, high artesian head, and discontinuous distribution. It has a significant influence on underground space development, especially where the MCA is directly connected with deep confined aquifers. In this paper, a series of pumping well tests were conducted in the MCA located in such area to investigate the dewatering-induced groundwater fluctuations and stratum deformation. In addition, a numerical method is proposed for the estimation of hydraulic parameter, and an empirical prediction method is developed for dewatering-induced ground settlement. Test results show that groundwater drawdowns and soil settlement can be observed not only in MCA but also in the aquifers underneath it. This indicates that there is a close hydraulic connection among each aquifer. Moreover, the distributions and development of soil settlement at various depths are parallel to those of groundwater drawdowns in most areas of the test site except the vicinity of pumping wells, where collapse-induced subsidence due to high-speed flow may occur. Furthermore, the largest deformation usually occurs at the top of the pumping aquifer instead of the ground surface, because the top layer is expanded due to the stress arch formed in it. Finally, the proposed methods are validated to be feasible according to the pumping well test results and can be employed to investigate the responses of groundwater fluctuations and stratum deformations due to dewatering in MCA.

show abstract

Test and numerical research on wall deflections induced by pre-excavation dewatering

Cited by 50 publications

References 26 publications

Deformation Characteristics of the Foundation Pit of the Underpass Viaduct and Grey Relational Analysis of the Maximum Horizontal Deflection of the Retaining Wall

Deformation Characteristics of the Foundation Pit of the Underpass Viaduct and Grey Relational Analysis of the Maximum Horizontal Deflection of the Retaining Wall

Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer

Contact Info

Product

Resources

About