Abstract
In this paper, we survey sandstone tunnels using sensor testing technology and conduct an in-depth analysis and research on the model of sandstone tunnel cracking based on the theory of fracture mechanics. This paper systematically investigates the static mechanical properties, energy evolution and distribution law, acoustic emission monitoring, and digital image correlation methods of intact and jointed rock chamber enclosures (including parallel jointed rock chamber enclosures and cross jointed rock chamber enclosures) under static loads, based on physical simulation test methods and combined with other technical means such as acoustic emission monitoring and digital image correlation methods. In this paper, the effects of parallel and cross-joint angles on the static mechanical properties, energy evolution and distribution, acoustic emission variability, progressive destabilization, and their mechanisms are compared and analyzed. This paper takes fiber Bragg grating (FBG) sensing theory and technology research as a breakthrough, relies on major underground engineering geohazard model tests, and proposes a grating spectral reconstruction theory based on the wavelength position constraint of the spectral center and its improvement based on an in-depth analysis of the influence of fiber grating intrinsic parameters and strain distribution on the reflection spectral properties. Based on an in-depth analysis of the influence of spectral center wavelength location and strain distribution on the reflectance spectral properties, we propose the grating spectral reconstruction theory based on the spectral center wavelength location constraint and its improved genetic algorithm optimization method; realize the fast and accurate identification and rejection of the melancholy effect of fiber grating; propose the sensor numerical simulation optimization design method; develop the high sensitivity seepage pressure sensor, new strain sensor, target flow sensor, microdisplacement sensor, and multipoint displacement sensor; and build a large capacity, multi-parameter fiber grating real-time monitoring network.
Highlights
After entering the 21st century, with the implementation of the modernization strategy and continuous deepening, the national investment in some important fields related to the national economy and people’s livelihood has increased greatly, and the fields of transportation and civil engineering, water conservancy, and hydropower, mineral resources, electric power and energy, aerospace, machinery, and chemical industry have ushered in an unprecedented leap forward, which has brought great opportunities for the development and progress of science and technology in various fields [1]
The sensitivity of the sensor is defined as the ratio of the increment of the output quantity to the corresponding increment of the input quantity that causes the increment, so the sensitivity of the tunnel magnetoresistance (TMR) current sensor is the ratio of the change of the output voltage to the change of the measured current
The mechanism of rock instability damage and its stability and control problems is some of the key scientific problems that are currently focused on and urgently need to be solved in the field of rock mechanics
Summary
After entering the 21st century, with the implementation of the modernization strategy and continuous deepening, the national investment in some important fields related to the national economy and people’s livelihood has increased greatly, and the fields of transportation and civil engineering, water conservancy, and hydropower, mineral resources, electric power and energy, aerospace, machinery, and chemical industry have ushered in an unprecedented leap forward, which has brought great opportunities for the development and progress of science and technology in various fields [1]. At the same time, engineering catastrophes, geological disasters, and major production safety accidents have become the main challenges for the construction and development of various fields in our country, which can cause serious casualties, huge economic losses, and bad social impacts. In the fields of transportation and hydropower, as the focus of construction of water conservancy and hydropower projects and railway and highway projects has shifted to the western mountainous areas under complex terrain and geological conditions, a number of large buried depths, long tunnel lines, strong karst, high water pressure, tunnels with distinctive features such as high disaster risk and high construction difficulty, complex hydrogeological conditions, and major geological disasters such as water inrush and landslides can be regarded as world-class engineering problems. As the frontier technology of modern science and technology, sensing technology, computer technology, and communication technology are considered as the three technical pillars of modern information technology and become the high point of human competition for high-tech technology in the 21st century
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