scholarly journals Prediction of Jacking Force in Vertical Tunneling Projects Based on Neuro-Genetic Models

2021 ◽  
Vol 9 (1) ◽  
pp. 71
Author(s):  
Xin-Jiang Wei ◽  
Xiao Wang ◽  
Gang Wei ◽  
Cheng-Wei Zhu ◽  
Yu Shi
Keyword(s):  
Output Parameter ◽  
Geological Condition ◽  
Construction Process ◽  
Soil Pressure ◽  
Tunneling Method ◽  
Geological Conditions ◽  
Input Parameters ◽  
Ann Models ◽  
Geological Factor ◽  
Jacking Force

The vertical tunneling method is an emerging technique to build sewage inlets or outlets in constructed horizontal tunnels. The jacking force used to drive the standpipes upward is an essential factor during the construction process. This study aims to predict the jacking forces during the vertical tunneling construction process through two intelligence systems, namely, artificial neural networks (ANNs) and hybrid genetic algorithm optimized ANNs (GA-ANNs). In this paper, the Beihai hydraulic tunnel constructed by the vertical tunneling method in China is introduced, and the direct shear tests have been conducted. A database composed of 546 datasets with ten inputs and one output was prepared. The effective parameters are classified into three categories, including tunnel geometry factors, the geological factor, and jacking operation factors. These factors are considered as input parameters. The tunnel geometry factors include the jacking distance, the thickness of overlaying soil, and the height of overlaying water; the geological factor refers to the geological conditions; and the jacking operation factors consist of the dead weight of standpipes, effective overburden soil pressure, effective lateral soil pressure, average jacking speed, construction hours, and soil weakening measure. The output parameter, on the other hand, refers to the jacking force. Performance indices, including the coefficient of determination (R2), root mean square error (RMSE), and the absolute value of relative error (RE), are computed to compare the performance of the ANN models and the GA-ANN models. Comparison results show that the GA-ANN models perform better than the ANN model, especially on the RMSE values. Finally, parametric sensitivity analysis between the input parameters and output parameter is conducted, reaching the result that the height of overlaying water, the average jacking speed, and the geological condition are the most effective input parameters on the jacking force in this study.

Study on Structural Design and Driving Process of a Subway Station with Large Transection by Tunneling Method

2013 ◽  
Vol 353-356 ◽  
pp. 1325-1328 ◽  
Author(s):  
Xiao Jun Zhou ◽  
Chang Yu Yang
Keyword(s):  
Rock Mass ◽  
Structural Design ◽  
Subway Station ◽  
Great Success ◽  
Construction Process ◽  
Tunneling Method ◽  
Geological Conditions ◽  
Cut Method ◽  
Transfer Station ◽  
Composite Lining

Structural design and construction process for a subway station consists of two tunnels with large transection are discussed according to its function and geological conditions of rock mass in this paper. A composite lining is designed to support surrounding rock, and partial bench cut method, side drift method are utilized to build the special subway transfer station in rock mass. The practice of the designed scenario proves to be a great success and attains the safe construction of the station by tunneling method.

Study on the Drilling Formation Selection and Risk Analysis of the Directional Drilling

2012 ◽  
Vol 461 ◽  
pp. 652-655
Author(s):  
Ying Wu ◽  
Peng Zhang ◽  
Xiao Li
Keyword(s):  
Site Investigation ◽  
Construction Site ◽  
Construction Process ◽  
Directional Drilling ◽  
Selection Methods ◽  
Related Literature ◽  
Literature Research ◽  
Geological Conditions ◽  
Drilling Technology ◽  
Pipeline Crossing

Directional drilling technology is an important and very promising trenchless pipeline crossing technology. On the basis of the related literature research at home and abroad and our pipeline construction site investigation, focuses on several common soil properties are introduced, and then the formation adaptability of directional drilling is analyzed. The drilling selection methods are made when drilling in the specific geological conditions, and the possible risks of the construction process have been classified in the directional drilling.

scholarly journals Study on the Geological Condition Analysis and Grade Division of High Altitude and Cold Stope Slope

2021 ◽  
Vol 13 (22) ◽  
pp. 12464
Author(s):  
Ruichong Zhang ◽  
Shiwei Wu ◽  
Chenyu Xie ◽  
Qingfa Chen
Keyword(s):  
Low Temperature ◽  
High Altitude ◽  
Stable State ◽  
Geological Condition ◽  
Rock Layer ◽  
Eastern Slope ◽  
Geological Conditions ◽  
Grade Ii ◽  
Grade Division ◽  
Grade Iii

Analysis of the geological conditions of high-altitude and low-temperature stope slopes and the study of grade division are the basis for the evaluation of slope stability. Based on the engineering background of the eastern slope of the Preparatory iron mine in Hejing County, Xinjiang, we comprehensively analyse and summarize the factors that affect the geological conditions of high-altitude and cold slopes and finally determine nine geological conditions that affect the index parameters. Based on a back-propagation (BP) neural network algorithm, we establish an applicable network model to analyse the geological conditions of slopes in cold areas. The model is applied to the eastern slope to analyse and classify the geological conditions of the high-altitude and low-temperature slopes. The research results show that the skarn rock layer in the eastern slope is in a stable state and not prone to landslides, and its corresponding geological condition is Grade I; meanwhile, the monzonite porphyry rock layer is in a relatively stable state, with a potential for landslides and a corresponding geological condition Grade II. The marble rock layer is in a generally stable state, there is the possibility of landslide accidents, and the corresponding geological condition level is Grade III. The limestone rock layer is in an unstable state and prone to landslide accidents, it has a corresponding geology condition Grade IV. Therefore, the eastern slope can be divided into different geological condition regions: Zone I, Zone II, Zone III, and Zone IV, and the corresponding geological condition levels for these are Grade I, Grade II, Grade III, and Grade IV. These results may provide a basis for the stability evaluation of high altitudes and cold slopes.

scholarly journals Treatment Design and Construction Strategy for Tunnel Mud and Water Inrush Disaster

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Yike Wei ◽  
Lingfeng Yu
Keyword(s):  
Rapid Development ◽  
Water Inrush ◽  
Construction Process ◽  
Transportation Industry ◽  
Treatment Efficiency ◽  
Geographical Environment ◽  
Geological Conditions ◽  
Treatment Measures ◽  
Construction Strategy ◽  
Treatment Design

With the rapid development of the transportation industry in China, the number and scale of tunnel construction are increasing. Tunneling through fault zones and other complex geological environments is becoming more and more common. In the construction of highway tunnels, due to the special geographical environment and complex geological conditions, mud and water inrush often occur in the tunnel. Water inrush disasters pose a major risk to the construction of highway tunnels and affect the normal construction of highway tunnels. This paper combines the engineering background of the tunnel mud and water inrush accidents, carries out evaluation on the accident treatment measures and the treatment efficiency, and summarizes the main concerns in the construction process and the technical guidelines for dealing with the tunnel mud and water inrush.

Research on Advanced Geological Forecast Technology in the Large and Complex Underground Projects

2014 ◽  
Vol 608-609 ◽  
pp. 756-760
Author(s):  
Hong Wen Zhou ◽  
Chun Ying Lei ◽  
Yi Jun Shang ◽  
Jian Feng Zhang ◽  
Wei Wei ◽  
...  
Keyword(s):  
Coming Out ◽  
Multiple Solutions ◽  
Construction Project ◽  
Geophysical Methods ◽  
Construction Process ◽  
Underground Construction ◽  
Forecast System ◽  
Geological Interpretation ◽  
Combination Forecasting ◽  
Geological Conditions

The multi-hazard, wide-covered, complex factors during the large complex underground construction process pose severe challenges to the construction project. With the help of successful forecast cases, typical geological interpretation signs, optimization of combination forecasting scheme, comprehensive geological forecast system is constructed to effectively solve the disadvantage of multiple solutions coming out from the single geophysical methods, and greatly improve the accuracy of forecast of adverse geological conditions, thus ,the target of safety, economical operation and efficiency is achieved.

Anchorage Technology of the Umbrella-Shape Soil Anchor

2013 ◽  
Vol 278-280 ◽  
pp. 230-233
Author(s):  
Hong Bing Xia ◽  
Lei Zhang ◽  
Yi Jun Zhang
Keyword(s):  
Construction Process ◽  
Long Time ◽  
Pulling Force ◽  
Jacking Force

For shortcomings of more construction process ,long time of construction and no immediately bearing to soil anchor of steel stranded packed by cement, it is advanced the inside-opened umbrella-shape soil anchor. It is introduced structure of the soil anchor, calculating of jacking force, anti-pulling force and construction of the umbrella-shape soil anchor.

Design of High Speed Railway Tunnel and its Construction Method in Abrupt Slope with Loose Rockmass

2014 ◽  
Vol 580-583 ◽  
pp. 1096-1099 ◽  
Author(s):  
Xiao Jun Zhou ◽  
Bo Jiang ◽  
Rui Yang ◽  
Chao Ning
Keyword(s):  
High Speed ◽  
Rational Design ◽  
Composite Fiber ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Working Face ◽  
Tunneling Method ◽  
Geological Conditions ◽  
The Stability ◽  
Tunnel Portal

This paper mainly deals with the structural design of high speed railway tunnel and its driving method in abrupt slope with loose rockmass, meanwhile summarizes the connection between tunnel portal and bridge abutment in loose rockmass according to complicated landform and geology. The anti-slide piles are adopted to retain the stability of abrupt slope near the tunnel portal. In order to eliminate the risk and cost in tunnel construction, four bench cut method is invented to satisfy the safe excavation of loose rockmass in the tunnel. Composite fiber rockbolt is also employed to keep the stability of working face while driving the tunnel. The innovative tunneling method presented in the paper can be applied to guide the rational design and economical construction of high speed railway tunnels in loose surrounding rock under harsh geological conditions.

Instability Mechanism of Du Yun Pass Tunnel Entrance Weathered Stacking Area Analysis

2016 ◽  
Vol 858 ◽  
pp. 81-85
Author(s):  
Lin Liu ◽  
Yao Rong ◽  
Cheng Ke Zhang ◽  
Meng Yun Mao ◽  
Lu Lin Zhang
Keyword(s):  
Pile Foundation ◽  
Stability Problem ◽  
Surrounding Rock ◽  
Geological Condition ◽  
Construction Process ◽  
Instability Mechanism ◽  
Construction Scheme ◽  
The Stability ◽  
Tunnel Portal ◽  
Tunnel Entrance

The stability of the tunnel portal section under poor terrain and geological condition has always been the focus of construction safety. The stability problem has become more complex for the erosion accumulation area under the valley. In this paper, firstly the stability of the tunnel portal is classified. Combined with engineering cases, the FEM numerical method is used to simulate the supporting structure and construction process of the tunnel. Based on the distribution of the plastic zone and displacement of surrounding rock, the mechanism of the instability of the tunnel portal is analyzed. Through the optimized construction scheme that arranges pile foundation in tunnel arch foundation, the bearing capacity of foundation has been greatly improved, which has effectively prevented the instability of surrounding rock caused by the slope deformation and foundation settlement. The conclusions that have been drawn in this paper can be used for reference for related projects.

Leaf anatomy of Carex humilis does not correlate with orographic, geological and bioclimatic habitat conditions in C&SE Europe

Biologia ◽  
2014 ◽  
Vol 69 (3) ◽  
Author(s):  
Ksenija Jakovljević ◽  
Jasmina Šinžar-Sekulić ◽  
Snežana Vukojičić ◽  
Nevena Kuzmanović ◽  
Dmitar Lakušić
Keyword(s):  
Principal Component ◽  
Canonical Discriminant Analysis ◽  
Habitat Characteristics ◽  
Morphometric Study ◽  
Geological Condition ◽  
Habitat Conditions ◽  
Adaptive Responses ◽  
Geological Conditions ◽  
Anatomical Characters ◽  
Climatic Characteristics

AbstractThis paper presents the results of a multivariate morphometric study of leaf anatomical characters in different, geographically very distant populations of taxon Carex humilis from Hungary, Romania, Serbia, Bosnia & Herzegovina, Montenegro and Albania with the aim to reveal the trends of population differentiation. Analyses were performed on the cross-section of 173 leaves collected from 12 populations. In order to establish the overall morphological variation and relationships between individuals from all populations, principal component analyses (PCA) and canonical discriminant analysis (CDA) have been done. The UPGMA clustering analyses based on leaf anatomical characters and habitat climatic characteristics were carried out to explore whether the observed anatomical differences are a result of adaptive responses. Regression analysis (linear regression) was performed to identify the level of correlation between leaf anatomical characters and basic orographic, geological, and bioclimatic habitat characteristics. Quite unexpectedly, most of observed groups are formed of geographically very distant populations which are living in extremely different climatic and geological conditions, indicating that general anatomical differentiation in Carex humilis in C&SE Europe cannot be explained by the environmental impacts, and basically do not represent an adaptive response to different climatic or geological condition.

Metallogenic Series Classification for the Iron Belt of Northern Hebei and Shanxi to Western Liaoning

2012 ◽  
Vol 616-618 ◽  
pp. 185-189
Author(s):  
Dao Qing Zhou ◽  
Zheng Guo Fan ◽  
Lin Tan ◽  
Xu Zhao Huang ◽  
Bao Bao Cao ◽  
...  
Keyword(s):  
Large Scale ◽  
Iron Ore ◽  
Mining Area ◽  
Ore Deposits ◽  
Liaoning Province ◽  
Geological Condition ◽  
Western Liaoning ◽  
Genetic Types ◽  
Reference Information ◽  
Geological Conditions

The iron belt of northern Hebei and Shanxi provinces to western Liaoning province locates in great geological conditions and hosts various types iron mines, so the prospecting potential is huge. The found iron ore with industrial value have sedimentary metamorphic mines with large scale, and followed by magmatic, sedimentary, and contact-metasomatic ore deposits, etc. The iron mineralization of different types is great affiliated with the geotectonic environment of different geological periods, sedimentation, magmatic conditions, that behaviors different mineralization types corresponding to different geological periods in time, behaviors different iron mining area corresponding to different structural location in the space, consists of the iron metallogenic series coupled to the different time and the different genetic types in North China. Based on the analysis to the distribution regularity, ore-controlling factors and metallogenic series of iron mine, we deeped the regional ore-controlling geological condition and metallogenic regularity of iron ore, provided important reference information for regional exploration.

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