Analysis of the Ground Surface Settlement of Metro Tunnel by Using Peck Formula

2014 ◽  
Vol 1065-1069 ◽  
pp. 414-420
Author(s):  
Xiong Fei Yang ◽  
Hong Yuan ◽  
Jia Yu Wu ◽  
Hou Mei Zhang
Keyword(s):  
Surface Deformation ◽  
Ground Surface ◽  
Surface Subsidence ◽  
Central Point ◽  
Surface Settlement ◽  
Point Method ◽  
Linear Regression Method ◽  
Tunnel Excavation ◽  
Ground Surface Settlement ◽  
Ground Surface Subsidence

Based on the peck formula, this paper has analyzed measured data of ground surface subsidence, and get the regression curve of ground surface subsidence. Expression for degree of reliability of the maximum ground surface settlement is derived analytically by using central-point method. On the basis of a certain section of tunnel of Guangzhou subway constructed by mining excavation method, linear regression method can be effectively fitting the ground surface deformation data due to tunnel excavation. The central-point method provides a new way for reliability analysis of the ground surface settlement of shield construction.

Measurement Analysis of the Influence of Subway Station Construction to the Adjacent Building and Ground Surface Deformation

2012 ◽  
Vol 518-523 ◽  
pp. 4399-4404
Author(s):  
Jian Song ◽  
Xiao Yang Rong ◽  
Yun Yun Fan
Keyword(s):  
Surface Deformation ◽  
Ground Surface ◽  
Soil Disturbance ◽  
Surface Subsidence ◽  
Surface Settlement ◽  
Subway Station ◽  
Rock Foundation ◽  
Measurement Analysis ◽  
Adjacent Building ◽  
Ground Surface Settlement

According to the tracing monitoring results of surface settlement and deformation of method of PBA in large-span tunnel used in the construction of the of Shenyang subway station, the analysis shows the ground surface settlement characteristics and laws influenced by the process of tunnel excavation influence. The result shows that the influence to formation of soil disturbance is large, the step sequences influence the deformation of the surface subsidence obvious are the small pilot drift excavation and the buckle arch of the first lining, accounting for about 70% of the final settlement, while the other is smaller, therefore the key of the project is to control the ground surface settlement of the small pilot drift excavation and the buckle arch of the first lining. Analysis also shows that, the effect of grouting consolidation in the upper strata in the arch crown and surrounding rock foundation of buildings before the construction to reduce the surface subsidence and building deformation is obvious.

Analysis of Surface Subsidence Rule of the Shallow Subway Tunnel Construction

2013 ◽  
Vol 671-674 ◽  
pp. 1081-1086 ◽  
Author(s):  
Fei Fei Wang ◽  
Hui Ren Bai ◽  
Jing Jing Li
Keyword(s):  
Ground Surface ◽  
Calculation Model ◽  
Surface Subsidence ◽  
Surface Settlement ◽  
Tunnel Construction ◽  
Maximum Point ◽  
Subway Tunnel ◽  
Monitoring Frequency ◽  
Ground Surface Settlement ◽  
Value Range

In order to study the Dalian Metro section 202(Cujin Road station-Chunguang Street station, which is shallowly buried and covered with plain fill)’s ground surface settlement, the monitoring measuring station was built during the construction. After 3 months’ measuring by precision level,the data shows that the maximum point is in the center line of the tunnel of the upper part. The settlement is about 25.66-31.82mm. This paper put forward the concept of the distance span ratio β, β effective value range was - 4 <β< 4,Surface subsidence is closely related with β, Severe surface subsidence stage is -2 <β< 2, Occupy whole deformation is 67.5-77.6%,settlement rate about 0.84-0.93mm/d, so should strengthen the monitoring frequency, Suggest increases site tour. Field test results and the ground surface settlement calculation model winkle are identical with each other; the monitoring results have important guiding significance and reference for Dalian subway and the similar shallow depth excavation tunnel construction.

Ground surface subsidence as effect of underground mining of the thick coal seams in the Jiu valley basin / Osiadanie gruntów wskutek wybierania pokładów o dużej miąższości w kopalniach zagłębia w dolinie Jiu

2012 ◽  
Vol 57 (3) ◽  
pp. 547-577 ◽  
Author(s):  
Ilie Onica ◽  
Dacian Marian
Keyword(s):  
Surface Deformation ◽  
Longwall Mining ◽  
Underground Mining ◽  
Ground Surface ◽  
Surface Subsidence ◽  
Coal Seams ◽  
Elasto Plasticity ◽  
Ground Surface Subsidence ◽  
Time Dependent Analysis

Abstract In the case of the thick and gentle coal seam no. 3 of the Jiu Valley Coal Basin (Romania), the mining methods are by use of the longwall mining technologies with roof control by caving or top coal caving. In this paper, it is presented the analysis of the complex deformations of the ground surface, over time, as a consequence of the coal mining in certain mining fields of the basin. Also, it is analysed the ground surface subsidence phenomenon using the CESAR-LCPC finite element code. The modelling is made in the elasticity and the elasto-plasticity behaviour hypothesis. Also, the time dependent analysis of the ground surface deformation was achieved with the aid of an especial profile function. The obtained results are compared with the in situ measurements data basis.

Estimation of the ground surface settlement induced by the tunnel excavation in Changchun, China

2021 ◽  
Author(s):  
Jian Lu ◽  
Jingjing Sun ◽  
Yang Shen ◽  
Wei Zheng ◽  
Aijun Yao ◽  
...  
Keyword(s):  
Ground Surface ◽  
Surface Settlement ◽  
Tunnel Excavation ◽  
Ground Surface Settlement

scholarly journals MONITORING OF SURFACE SUBSIDENCE OF THE MINING AREA BASED ON SBAS

2018 ◽  
Vol XLII-3 ◽  
pp. 2603-2608
Author(s):  
Y. Zhu ◽  
S. Zhou ◽  
D. Zang ◽  
T. Lu
Keyword(s):  
Ground Surface ◽  
Surface Mining ◽  
Mining Area ◽  
Radar Data ◽  
Surface Subsidence ◽  
Surface Settlement ◽  
Jiangxi Province ◽  
Time Dimension ◽  
Short Baseline ◽  
Ground Surface Settlement

This paper has collected 7 scenes of L band PALSAR sensor radar data of a mine in FengCheng city, jiangxi province, using the Small-baseline Subset (SBAS) method to invert the surface subsidence of the mine. Baselines of interference less than 800m has been chosen to constitute short baseline differential interference atlas, using pixels whose average coherent coefficient was larger than or equal to 0.3 as like high coherent point target, using singular value decomposition (SVD) method to calculate deformation phase sequence based on these high coherent points, and the accumulation of settlements of study area of different period had been obtained, so as to reflect the ground surface settlement evolution of the settlement of the area. The results of the study has showed that: SBAS technology has overcome coherent problem of the traditionality D-InSAR technique, continuous deformation field of surface mining in time dimension of time could been obtained, characteristics of ground surface settlement of mining subsidence in different period has been displayed, so to improve the accuracy and reliability of the monitoring results.

The Study of Construction Countermeasures about Subway Tunnel Passes through High Fill Geological Area of Crushed Rock Soil

2012 ◽  
Vol 170-173 ◽  
pp. 1801-1809
Author(s):  
Lin Qing Huang ◽  
Tong Qing Wu ◽  
Zhi Gang Qi
Keyword(s):  
Technical Problem ◽  
Ground Surface ◽  
Surface Settlement ◽  
Crushed Rock ◽  
Subway Tunnel ◽  
Tunnel Excavation ◽  
Existing Building ◽  
Ground Surface Settlement ◽  
Calculation Results ◽  
Pass Through

This is an important technical problem that subway tunnel excavation pass through a filled area of crushed rock soil in mountainous city,and to control the ground surface settlement and reduce the influence for existing building have great significance. The paper presents an example that tunnel excavation pass through complex geological area of metro line no.3 project in Chongqing.At first,according to the monitoring results,the big surface subsidence and structures cracking appear in the process of the tunnel excavation are discussed.And then,use the finite element method analysis and calculation. On the basis of the analysis and calculation results, many effective technical measures are proposed to ensure stability of surrounding rock and control the ground surf ace settlement. Such as small catheter grouting consolidation, CD construction method, excavation speed control and so on. The monitoring results show that the vault sinks and convergence value reduce significantly after the improved technology measures are used.At same time,the ground surface settlement is controlled effec- tively. The results show that the improved construction measures achieve the purpose to control the settlement and deformation. The study result of construction scheme can provide reference for the similar project.

scholarly journals Development and Application of Model Test System for Reconstruction and Expansion of Existing Shallow Single-Hole Tunnel into Twin-Arch Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Yanling Jia ◽  
Aohui Ouyang ◽  
Siyu Wang ◽  
Xing Liang ◽  
Bin Wang ◽  
...  
Keyword(s):  
Model Test ◽  
Ground Surface ◽  
Test System ◽  
Surrounding Rock ◽  
Surface Settlement ◽  
Laboratory Model ◽  
Internal Stresses ◽  
Tunnel Excavation ◽  
Single Hole ◽  
Ground Surface Settlement

In this study, we developed a tunnel excavation model test system to investigate the deformation and mechanical response of the surrounding rocks and tunnel structure during the reconstruction and expansion of an existing shallow single-hole tunnel into a twin-arch tunnel. A model test was conducted to study the variation in the ground surface settlement characteristics, surrounding rock pressure, and internal stresses of the supporting structure and midwall during the construction process. The influence of the excavation distance on displacements and structural stress between the faces of the left and right tunnels was analysed using numerical software. A comparison between the model test results and the monitoring and measurement construction results revealed a fairly consistent ground surface settlement, indicating that the system is stable and reliable and can be widely applied to laboratory model test research on tunnel excavation. Results show that the excavation of the first tunnel had a significant effect on the stability of the surrounding rock within the distance of a single-tunnel span behind the tunnel face. When the excavation distance between the two tunnels exceeded twice the length of the single-tunnel span, its effect on the stresses and deformation of the reconstructed twin-arch tunnel was negligible.

Contrast Analysis on Deformation Characteristic of Urban Subway Tunnel Excavation by Numerical Simulation and Field Measurement

2012 ◽  
Vol 170-173 ◽  
pp. 1704-1707
Author(s):  
Wei Feng Yang ◽  
Xi Liu ◽  
Yi Wang ◽  
Ming Li
Keyword(s):  
Numerical Simulation ◽  
Field Measurement ◽  
Ground Surface ◽  
Horizontal Displacement ◽  
Surface Settlement ◽  
Loss Ratio ◽  
Tunnel Excavation ◽  
Geological Conditions ◽  
Ground Surface Settlement ◽  
Ground Loss

Under the particular geological conditions of clay and sandy soil interbed, through numerical analysis and field monitoring, the surface settlement, horizontal deformation and the stress distribution were analyzed after the tunnel excavation in a metro station in Beijing, China. There are differences of surface deformation whether the backfill grouting behind arch during tunnel excavation. While the backfill grouting behind arch, the ground surface settlement and the horizontal displacement reach 9.36 mm and 2.16 mm respectively. But while no backfill grouting behind arch, the ground surface settlement and the horizontal displacement are 14.51 mm and 8.85 mm respectively. The maximum ground settlement induced by tunnel excavation is directly proportional to ground loss ratio. When the ground loss ratio is 1%, the result is well consistent with the field measurement value and the numerical simulation result.

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