Showing papers in "Tunnelling and Underground Space Technology in 2016"

TL;DR: The use of underground space can help cities meet these increased demands while remaining compact, or find the space needed to include new functions in an existing city landscape as mentioned in this paper, which is not limited to large scale infrastructure projects, but also includes commercial and residential use, storage, water conveyance and treatment, and heritage conservation.

TL;DR: In this paper, a full-dimensional dynamic finite element model of the tunnel and rock system is used to assess the seismic damage observed in the tunnel, and to evaluate the influence of the longitudinal and vertical motions on the seismic response.

TL;DR: In this article, the influence of a nearby large excavation on existing metro tunnels of the Ningbo Metro Line 1 in sensitive soft soils is investigated and presented, and several protective measures are studied, including divided excavation, soil improvement and a cut-off wall.

TL;DR: In this paper, a tension and compression-shear damage model is developed, and then is implemented into the commercial software LS-DYNA as a user-defined material model, and the comparison between numerical results and an existing field test is conducted.

TL;DR: A review of the existing models for performance prediction of TBMs and some of the ongoing research on developing better models for improved accuracy of performance estimate and increasing TBM utilization can be found in this paper.

TL;DR: The results of the analysis show that AI based methods can effectively be implemented for prediction of TBM performance and it was concluded that performance of the SVR model is better than the ANFIS model.

TL;DR: The adverse geological conditions frequently encountered during TBM tunnelling present great challenges, and may trigger potential hazards if no precaution and treatment measures are taken as discussed by the authors, and comprehensive studies on adverse conditions are essential and critical to successful TBM Tunnelling.

TL;DR: Wang et al. as discussed by the authors investigated the current problems of UUS development and utilization in China, and then analyzed the planning methods and general thoughts of overall underground space layout, which is conducive to the orderly development of urban space and alleviation of increasing human-land conflicts.

TL;DR: In this paper, the status, problems and trends of China's underground space development are presented in association with the features of use of China’s underground space, such as the large scale, rapid development, high speed subway, various forms are summarized.

TL;DR: In this paper, a series of in-situ tests and numerical simulations were conducted to reveal displacement characteristics and obtain optimal construction approaches for large-span loess tunnels in China.

TL;DR: In this paper, a series of dynamic centrifuge tests were carried out at the geotechnical centrifuge facility of IFSTTAR in Nantes, to investigate the response of box-type tunnels embedded in dry sand under sinusoidal and seismic excitation, as affected by soil-tunnel relative flexibility and soil-structure interface rugosity.

TL;DR: In this article, a fractal calculation method has been proposed to study the self-similarity of the energy distribution of microseismic events during the development of immediate rockbursts.

TL;DR: In this article, the application and development of TBM manufacturing and tunnelling technologies in China are reviewed and summarized, and the market demand and application prospect are predicted; the complex geological conditions and technical challenges which will be encountered in China's future TBM engineering are analyzed.

TL;DR: Wang et al. as mentioned in this paper presented a detailed model to assess resilience of shield tunnel, and the performance robustness under disruption and the subsequent recovery rapidity are emphasized in this model, which results in a resilience index (Re) between 0.28 and 0.45.

TL;DR: In this paper, the authors reviewed existing approaches to the composition of urban indicator lists, highlighting indicator types, challenges related to data collection, and agencies that are concerned with the issue.

TL;DR: In this article, the authors presented a life cycle cost analysis of a highway tunnel, which compared construction, maintenance, and lighting costs needed to manage the highway tunnel and showed the importance of surface pavement material, since it may contribute to the interreflected light and reduce electric energy consumption.

TL;DR: In this paper, a novel clustered assembly approach with irregular boundaries for grain-based brittle rock is incorporated into the particle flow code (PFC) to calibrate the macro-responses such as the low tensile to compressive strength ratio observed in laboratory tests.

TL;DR: Wang et al. as discussed by the authors presented a method employing electric heat tracing (EHT) was presented in order to prevent frost damage, and the EHT-based freeze-proof system layout and installation procedures were also introduced.

TL;DR: In this paper, the authors conducted a series of model tests on segmental tunnels subjected to normal faulting and showed that structural damage to the segments was very low due to the adequate geometric functioning of the segments and their joints.

TL;DR: In this article, the authors look at how UUS has been used within cities now, and in the future, and investigates the implications for achieving more liveable cities, which includes cognisance of the potential for radical transformation rather than adaption.

TL;DR: In this article, the authors discuss the technical challenges of using TBMs in mining since the pioneering work in the 1960s and provide corresponding mitigations measures to cope with complex grounds in mines.

TL;DR: In this paper, the authors considered the non-continuity of the shield tunnel lining and the interactions among tunnel segment, surrounding rocks and ballast bed and established a hybrid model of a shield tunnel based on 3D nonlinear contact theory.

TL;DR: In this paper, the stability of an underground cavern group is investigated on the basis of large-scale 3D geomechanical model tests and numerical simulations, where multiple measurement techniques are developed to measure the convergence of deformation in the cavern, displacements at key points in the side walls and the damage pattern during the excavation simulation process.

TL;DR: In this paper, the authors proposed a simplified analytical method for evaluating the behavior of underlying tunnels prior to construction, where the tunnel is simply considered as a continuous Euler-Bernoulli beam with a certain equivalent bending stiffness.

TL;DR: Based on the double shell anchor-grouting reinforcement mechanism, WSAGRT was implemented in the coal mine with the pertinent support parameters optimized by numerical simulation and onsite experiments as mentioned in this paper.

TL;DR: In this paper, the authors used a three-dimensional finite difference method to simulate the tunneling process of the EPB shield machine and found that grouting pressure and quality appear to determine the surface settlement rather than the supporting pressure at workface.

TL;DR: In this paper, a single pile subjected to excavation induced ground movements is analyzed using the finite element method, which has the ability to simulate the construction sequence comprising soil excavation, deformations due to dewatering within the excavation and installation of struts.

TL;DR: Wang et al. as mentioned in this paper demonstrate and evaluate an integrated system coupling 3D binocular photogrammetry and discontinuous deformation analysis (DDA) for stability analysis of tunnels in blocky rockmass.

TL;DR: In this paper, a fully analytical solution is proposed, for stresses and displacements around a tunnel, excavated in an elastic-brittle-plastic material compatible with linear Mohr-Coulomb criterion or a nonlinear Hoek-Brown failure criterion considering the effect of the damaged zone induced by the excavation impact.

TL;DR: In this article, an implicit to explicit sequential solution method (IESSM) was performed to examine the dynamic fracturing behavior of an underground opening due to dynamic disturbance, and the characteristics of strain energy density (SED) and fracturing zone were investigated under various lateral pressure coefficients.