The Influence of Earth Pressure Balanced Shield Tunnel Underpassing Coastal Water Body on Stratum Deformation

2019 ◽  
Vol 83 (sp1) ◽  
pp. 237 ◽  
Author(s):  
Caixia Guo ◽  
Xiaoming Guan ◽  
Leilei Shi ◽  
Shengyuan Qiu
Keyword(s):  
Coastal Water ◽  
Water Body ◽  
Earth Pressure ◽  
Shield Tunnel ◽  
Stratum Deformation

Method of Calculating Chamber Earth Pressure of EPB Shield

2014 ◽  
Vol 886 ◽  
pp. 426-431 ◽  
Author(s):  
Bo Liang ◽  
Jing Cao ◽  
Hai Xing Yang ◽  
Zu De Ding ◽  
Hui Ming Zhao
Keyword(s):  
Limit Equilibrium ◽  
Earth Pressure ◽  
Relative Displacement ◽  
Shield Tunnel ◽  
Limit States ◽  
Relationship Of ◽  
The Relationship ◽  
Epb Shield ◽  
Selection Of ◽  
Construction Practice

In order to calculate earth pressure in working chamber, three calculation modes which corresponding to status of elastic balanced, active limit equilibrium and passive limit equilibrium of the soil on the excavation face was built. The relationship of relative displacement between the soil in the chamber and the soil on the excavation face of shallow EPB shield tunnel was analyzed based on Rankines earth pressure theory. The threshold of chamber earth pressure values which correspond to the limit states of subsidence and upheaval were deduced and the reasonable range of the values were obtained. Combined with a shield tunnel construction practice, the theoretical and measured values are compared. The results show that the theoretical equations are valid and can provide a theoretical approach for the selection of chamber earth pressure.

Research on Chamber Earth Pressure of EPB Shield Considering Soil Arching Effect

2014 ◽  
Vol 1065-1069 ◽  
pp. 373-377
Author(s):  
Jing Cao ◽  
Hai Xing Yang ◽  
Bo Liang ◽  
Hai Ming Liu
Keyword(s):  
Earth Pressure ◽  
Shield Tunnel ◽  
Pressure Balance ◽  
Soil Arching ◽  
Shield Tunneling ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Earth Pressure Balance ◽  
Tunnel Depth ◽  
Epb Shield

Chamber earth pressure is one of the significant parameters during the Earth Pressure Balance (EPB) shield construction processing. The soil arching effect is existence when the tunnel depth is enough. It is significant to consider the influence of arching effect to analyze the pressure in soil chamber in shield tunneling. In this paper, the influence of arching effect is considered to calculate the chamber earth pressure. Firstly, the soil is supposed as loose media, and the necessary buried depth of producing arching affects is deduced according to the loose media theory. Then, based on the characteristic of proper arching axis, the equation and the height of proper arch are obtained. At last, the calculation formula of minimum chamber earth pressure of EPB shield tunnel is deduced which can consider the effect of arching effect.

Development of coastal water body database on KISSEL server

2012 ◽  
Author(s):  
Ddgl Dahanayaka ◽  
Hideyuki Tonooka ◽  
Mjs Wijeyaratne ◽  
Atsushi Minato ◽  
Satoru Ozawa
Keyword(s):  
Coastal Water ◽  
Water Body

scholarly journals Effects of Sewage Discharge on Trophic State and Water Quality in a Coastal Ecosystem of the Gulf of California

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Héctor Hugo Vargas-González ◽  
José Alfredo Arreola-Lizárraga ◽  
Renato Arturo Mendoza-Salgado ◽  
Lía Celina Méndez-Rodríguez ◽  
Carlos Hernando Lechuga-Deveze ◽  
...  
Keyword(s):  
Water Quality ◽  
Coastal Water ◽  
Environmental Quality ◽  
Water Body ◽  
Gulf Of California ◽  
Trophic State ◽  
Coastal Ecosystem ◽  
Urban Wastewater ◽  
Receiving Water

This paper provides evidence of the effects of urban wastewater discharges on the trophic state and environmental quality of a coastal water body in a semiarid subtropical region in the Gulf of California. The concentrations of dissolved inorganic nutrients and organic matter from urban wastewater primary treatment were estimated. La Salada Cove was the receiving water body and parameters measured during an annual cycle were temperature, salinity, dissolved oxygen, nitrite, nitrate, ammonia, orthophosphate, and chlorophylla. The effects of sewage inputs were determined by using Trophic State Index (TRIX) and the Arid Zone Coastal Water Quality Index (AZCI). It was observed that urban wastewater of the city of Guaymas provided 1,237 ton Nyr−1and 811 ton Pyr−1and TRIX indicated that the receiving water body showed symptoms of eutrophication from an oligotrophic state to a mesotrophic state; AZCI also indicated that the environmental quality of the water body was poor. The effects of urban wastewater supply with insufficient treatment resulted in symptoms of eutrophication and loss of ecological functions and services of the coastal ecosystem in La Salada Cove.

scholarly journals SỬ DỤNG CÁC CHỈ SỐ ĐỂ ĐÁNH GIÁ CHẤT LƯỢNG NƯỚC VÀ PHÂN LOẠI MỨC ĐỘ PHÚ DƯỠNG CỦA VÙNG NƯỚC VEN BIỂN QUẢNG NINH - HẢI PHÒNG

2018 ◽  
Vol 17 (4) ◽  
pp. 490-497
Author(s):  
Le Van Nam ◽  
Duong Thanh Nghi ◽  
Le Thi Kim Ngan
Keyword(s):  
Economic Growth ◽  
Water Quality ◽  
Coastal Water ◽  
Water Body ◽  
Sea Water ◽  
Environmental Safety ◽  
Coastal Areas ◽  
Limit Values ◽  
Coastal Water Quality ◽  
Quang Ninh

With the fast economic growth and the loose management of pollutants discharged into the sea, the Quang Ninh - Hai Phong coastal water faces the risk of contamination of toxic subtances; and the eutrophication can occur. Therefore, coastal water quality was monitored at Tra Co, Cua Luc and Do Son in 2015. The results showed that sea water had the higher concentration of nitrate and 4.4’DDD compared to limit values. RQ coefficient of coastal areas was medium (0.25 < 0.562 < 0.75), hence “environmental safety”. According to the SWQI index, the water quality in three stations was good and not polluted. In terms of eutrophication level classification according to OECD (1982), the water body of all stations was mesotrophic. According to classification by TRIX index, only water body of Do Son station was in a state of eutrophication, that of the remaining stations was mesotrophic.

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