摘要详情
124 / 2021-09-30 22:10:47
A three-dimensional approach to automatic monitoring of underground constructions
Convergence,construction monitoring,on-site monitoring data
全文录用
The traditional design approach in underground constructions relies on various hypotheses to schematize the mechanical and deformative behavior of the surrounding rock mass. Due to the large number of uncertainties involved, the design assumptions should be validated during the construction phase. This process is usually carried out by means of a regular monitoring activity of the deformations arising in proximity of the tunnel face.
Various studies highlighted the relationship between the different components of the rock mass deformation, namely tunnel convergence, pre-convergence and front extrusion, and their importance in the construction process of underground structures (Lunardi, 2008). The effective monitoring of both the tunnel walls and the advance core is essential in the identification of potential instabilities, providing useful indications to understand the rock mass behavior and to act properly in the underground works execution. Solutions and design improvements can be planned by measuring the deformations caused by the excavation in a three-dimensional manner.
The monitoring concept here presented aims to provide a 3D approach to the monitoring activity of underground constructions, by integrating in the same system a series of different devices intended to investigate the deformations generated from the interaction between the underground structure and the surrounding environment. The system includes a tool for the direct monitoring of pre-convergence, called PreConv Array; a second device, called Cir Array, that measure the convergence of the tunnel profile in specific excavation sections; and a third one named Rad Array designed to detect deformations developing in the rock mass around the tunnel cavity. All these devices consist of a series of sensors distributed along a fiberglass rod and connected with a single quadrupole cable for the data transmission, and are based on MUMS (Modular Underground Monitoring System) technology (firstly introduced by Segalini and Carini 2011).
The PreConv Array is designed to be inserted and cemented inside an advancing borehole or directly in a forepole reinforcement. The Cir Array are installed between the rock mass and the final coating, while the Rad Array can be placed inside a radial borehole drilled approximately at a 45°-degree angle in the side of the tunnel cavity. The instrumentation is intended to remain embedded in the final lining, providing continuous control of the tunnel deformations during its operational phase. Each device is connected to a control unit that automatically queries the sensors and sends the data to an elaboration center at predefined time intervals. Once processed, the data are represented on a dynamic web-based platform, providing a complete and immediate description of the rock mass behavior.
Various studies highlighted the relationship between the different components of the rock mass deformation, namely tunnel convergence, pre-convergence and front extrusion, and their importance in the construction process of underground structures (Lunardi, 2008). The effective monitoring of both the tunnel walls and the advance core is essential in the identification of potential instabilities, providing useful indications to understand the rock mass behavior and to act properly in the underground works execution. Solutions and design improvements can be planned by measuring the deformations caused by the excavation in a three-dimensional manner.
The monitoring concept here presented aims to provide a 3D approach to the monitoring activity of underground constructions, by integrating in the same system a series of different devices intended to investigate the deformations generated from the interaction between the underground structure and the surrounding environment. The system includes a tool for the direct monitoring of pre-convergence, called PreConv Array; a second device, called Cir Array, that measure the convergence of the tunnel profile in specific excavation sections; and a third one named Rad Array designed to detect deformations developing in the rock mass around the tunnel cavity. All these devices consist of a series of sensors distributed along a fiberglass rod and connected with a single quadrupole cable for the data transmission, and are based on MUMS (Modular Underground Monitoring System) technology (firstly introduced by Segalini and Carini 2011).
The PreConv Array is designed to be inserted and cemented inside an advancing borehole or directly in a forepole reinforcement. The Cir Array are installed between the rock mass and the final coating, while the Rad Array can be placed inside a radial borehole drilled approximately at a 45°-degree angle in the side of the tunnel cavity. The instrumentation is intended to remain embedded in the final lining, providing continuous control of the tunnel deformations during its operational phase. Each device is connected to a control unit that automatically queries the sensors and sends the data to an elaboration center at predefined time intervals. Once processed, the data are represented on a dynamic web-based platform, providing a complete and immediate description of the rock mass behavior.
重要日期
-
会议日期
11月21日
2021
至11月25日
2021
-
11月01日 2021
初稿截稿日期
-
11月05日 2021
注册截止日期
主办单位
International Committee of Mine Safety Science and Engineering
承办单位
GIG
联系方式
- Mr. Filip WASILEWSKI
- is******@gig.eu
历届会议
-
2024年08月17日 美国 Pittsburgh
The 7th International Symposium on Mine Safety Science and Engineering (ISMSSE 2024) -
2023年08月18日 中国 Harbin
6th INTERNATIONAL SYMPOSIUM ON MINE SAFETY SCIENCE AND ENGINEERING -
2018年10月22日 中国
第四届矿山安全科学与工程国际会议 -
2013年09月21日 中国 北京市
第二届矿山安全科学与工程国际学术会议
