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Showing papers in "Tunnelling and Underground Space Technology in 2018"


Journal ArticleDOI
TL;DR: A novel image recognition algorithm for semantic segmentation of crack and leakage defects of metro shield tunnel using hierarchies of features extracted by fully convolutional network (FCN) can be employed to rapidly and accurately recognize defects for structure health monitoring and maintenance of metro Shield tunnels.

255 citations


Journal ArticleDOI
TL;DR: A comprehensive review of the research efforts since 1965, which includes empirical, numerical, statistical and intelligent classification methods, highlights the source of data, timeline of study and the comparative performance of various techniques in terms of their prediction accuracy wherever available.

248 citations


Journal ArticleDOI
Fengqiang Gong1, Luo Yong1, Xibing Li1, Si Xuefeng1, Ming Tao1 
TL;DR: In this article, the uniaxial compressive strength and rockburst tendency of red sandstone are measured and the mechanism by which spalling damage on induces rockburst is revealed.

175 citations


Journal ArticleDOI
TL;DR: In this paper, a methodology for rock burst forecasting involving the use of a fuzzy comprehensive evaluation model was developed, which allows for a more quantitative evaluation of the likelihood for the occurrence of a rock burst incident.

143 citations


Journal ArticleDOI
TL;DR: In this paper, a soil-tunnel interaction model based on the Timoshenko beam simplified model (TBSM) of tunnel on Vlasov foundation was proposed to analyze the behaviors of a shield tunnel subjected to external forces transferred from surcharge load on the ground surface.

130 citations


Journal ArticleDOI
TL;DR: In this article, the authors introduce the latest status for common utility tunnels in China by collecting and analyzing existing and planned utility tunnels from 1959 to 2020, and summarize the key issues that may influence the development of utility tunnel in China.

123 citations


Journal ArticleDOI
TL;DR: In this article, the effect of strong environmental wind on a tunnel fire under natural ventilation was investigated using large eddy simulation method in order to investigate the smoke movement under the stack effect induced inside a shaft.

116 citations


Journal ArticleDOI
TL;DR: In this paper, the influence of joint characteristic parameters on cutting force and penetration was studied on the basis of Rolling Indentation Abrasion Test (RIAT), and the optimal angle between horizontal and joint plane is equal to 30° for rock breaking process.

116 citations


Journal ArticleDOI
TL;DR: In this paper, a simple approach to characterise the tunnel bore conditions is proposed and applied to a case study where four sewer pipelines of the Shulin district sewer network in Taipei County, Taiwan were constructed to verify its validity.

114 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the influence of the surrounding material (rock and soil) strengths and buried depths on the deformation and failure mechanism of a shallow underground tunnel through the transparent soil model test technique and PFC 3D numerical simulation.

113 citations


Journal ArticleDOI
TL;DR: In this article, the role of weak planes around tunnels in rockburst occurrence and damage was studied and a heterogeneous Abaqus2D explicit code was used to simulate dynamic rock failure in deep tunnels.

Journal ArticleDOI
TL;DR: In this paper, the authors focus on investigating and analyzing the total displacements around a circular tunnel in a visco-elastic medium by performing an isotropic axisymmetric finite difference modeling, proposing a new yet simplified approach that practitioners can use taking into account the effect of time.

Journal ArticleDOI
TL;DR: In this article, a simplified analytical method is proposed to predict the shield tunnel behaviors associated with adjacent excavation by introducing the Pasternak foundation model with a modified subgrade modulus.

Journal ArticleDOI
TL;DR: In this article, an overview of research on fire safety in underground road and railway tunnels from the perspectives of fire safety design is presented, focusing on design fires, structural protection, smoke control and use of water-based fire suppression systems.

Journal ArticleDOI
TL;DR: In this paper, a rigid plate was set in front of the tunnel face to maintain stability at the initial state, by moving the plate backward from the soil, the displacement and earth pressure curve of tunnel face was obtained.

Journal ArticleDOI
TL;DR: In this paper, a 3D steady-state seepage field obtained numerically is used to interpolate hydraulic heads of the 3D collapse mechanism and seepages force is incorporated into this predicting model by directly considering it as a body force.

Journal ArticleDOI
TL;DR: Experimental data from the in-field blast tests and simulation tests show that the proposed approach can well identify TDOA and hence detect the event source locations of the field blasting tests.

Journal ArticleDOI
Hongyuan Fang1, Bin Li1, Fuming Wang1, Yuke Wang1, Can Cui1 
TL;DR: In this article, the authors investigated the mechanical behavior of drainage pipeline under traffic load before and after polymer grouting and cement grouting trenchless repairing through three-dimensional finite element method (FEM).

Journal ArticleDOI
TL;DR: In this article, the authors investigated the distribution and characteristics of these seismic damages and summarized to assess potential influencing factors, such as lining cracks, spalling and collapse of concrete lining, construction joint damage, pavement damage and groundwater leakage.

Journal ArticleDOI
TL;DR: In this article, the authors carried out field investigations at five different tunnels located in Himalaya, India to study blast induced damage for wide range of rock mass quality Q values (0.03-17.8).

Journal ArticleDOI
TL;DR: Wang et al. as mentioned in this paper proposed the concrete-filled steel tubular support (CSTS), which is composed of a seamless steel tube bent to conform to the cross-section of the roadway and filled with concrete.

Journal ArticleDOI
TL;DR: In this paper, an analytical solution is derived to investigate the seismic response of long tunnels, built in non-homogeneous ground, subjected to sinusoidal shear motions, where the tunnel is excavated in two different soil deposits that have a sharp contact and there is a transition zone through the contact.

Journal ArticleDOI
TL;DR: In this paper, a series of full-scale tests of segmental joint for underwater shield tunnel are carried out to investigate the bending performance under compression-bending loads and comparative numerical simulations are conducted to compare with the test results and analyze the occurrence and development process of joint failure.

Journal ArticleDOI
TL;DR: In this article, a new framework for the probabilistic analysis of tunnel longitudinal performance is presented, where the conditional random field theory is adopted to simulate the spatial variation of soil properties along the tunnel longitudinal direction, in which the soil properties at borehole locations can be explicitly considered.

Journal ArticleDOI
TL;DR: In this article, an index system for UUS resource evaluation was put forward and its analytical process was based on the Geographic Information System (GIS) and some mathematical tools, such as the analytic hierarchy process (AHP), the most unfavorable grading method (MUGM) and the exclusive method (EM).

Journal ArticleDOI
TL;DR: In this paper, a suite of three dimensional finite-element analyses are performed to investigate soil disturbance during tunneling construction, and the analysis results show that the excessively high or low support pressure and grout ratio can both cause severe soil disturbance degree, which results in significant post-construction settlement.

Journal ArticleDOI
TL;DR: In this article, the tensile strength and acoustic emission of shale were investigated at various orientations of the laminations with respect to the loading direction, and the results showed that fractal dimension values fluctuate with increase of the stress, signifying the initiation of complex microcracks within the shale.

Journal ArticleDOI
TL;DR: Wang et al. as discussed by the authors analyzed the deformation characteristics of existing tunnels and the ground caused by the construction of a new shield tunnel underneath the existing subway lines, and the difference between the settlement of greenfield and the existing tunnel was analyzed.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effect of alternating soft and hard strata on the stability of rock surrounding tunnels, and physical experiments and numerical simulations were performed to simulate tunnel excavation in slanted upper-soft and lower-hard strata.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the failure of the tunnel face induced by the steady state seepage, and a series of the centrifuge model tests was performed, and they found that the effective support pressure firstly decreases steeply to the limit effective pressure and then increases gradually to a steady value.