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This proceedings volume contains over 300 papers on rock mechanics and engineering with contributors from all over Asia and many other parts of the world. Seven keynote papers summarize the state-of-the-art in rock engineering including topics such as underground rock caverns. The technical papers cover a wide range of rock mechanics and engineering topics: rock tunnels, caverns, mining, rock slopes and dams, rock blasting, rock burst and failure, rock properties, rock mass, rock joints, and block theory. Numerous valuable rock engineering case studies are also reported.
This volume should serve as a useful reference for the engineers and researchers in rock mechanics and rock engineering.
Sample Chapter(s)
Chapter 1: Forensic Engineering for Underground Construction (244 KB)
https://doi.org/10.1142/9789812772411_fmatter
PREFACE.
ORGANISATION.
ACKNOWLEDGEMENT OF PAPER REVIEWERS.
CONTENTS.
https://doi.org/10.1142/9789812772411_0001
In the context of underground construction, forensic engineering is taken to be the application of engineering principles and methodologies to determine the cause of a performance deficiency, often a collapse, in an excavation, and the reporting of the findings, usually in the form of an expert opinion within the legal system. The procedures that may be used in forensic geotechnical investigations and the interface of the engineer with the legal system are discussed. The application of the principles and methodologies outlined are illustrated through a brief account of the investigation of the collapse of a small part of an excavation in the Lane Cove Tunnel Project, Sydney, Australia, on 2 November, 2005.
https://doi.org/10.1142/9789812772411_0002
Thermo-mechanical behaviors of rock masses around underground LNG storage cavern are evaluated by analyzing in-situ rock mass responses measured at the Daejeon pilot cavern and a 2-dimensional numerical model of a lined LNG rock pilot cavern with UDEC and PFC2D, with aims to estimate the temperature profile in the containment system including the surrounding rock mass and to study the mechanical response of the rock mass under a thermal loading. The in-situ measured rock mass responses from the operation of the LNG pilot cavern are found in good agreement with the results of the numerical analyses. Overall monitored results from the pilot experiences confirm that construction and operation of underground LNG storage in lined rock caverns are technically feasible from rock mechanical point of view. The Daejeon LNG storage pilot cavern represents a further important step in the validation of technology of lined LNG underground storage. Even though the cavern was small, this project will permit to draw the potential and critical parameters for construction, start up and operation of the new technology in a real scale.
https://doi.org/10.1142/9789812772411_0003
Recent advances in test and design and computational frameworks of the rock mechanics in mining engineering at great depth are reviewed. It is shown that the main differences for the characteristics of rock mass for deep mining compared with shallow mining are as follows: (1) mining environments, High ground stress, High earth temperature, High karst water pressure, and mining Disturbance (HHHD), (2) five transform features of mechanical characters, (3) four changes of coal mine types and, (4) six typical engineering hazards. With the detailed researches on the nonlinear mechanical characteristics of rock mass in deep mining engineering under complicated geological and mechanical environments, it is shown that the mechanical system is nonlinear for rock mass at depth, but is linear for that at shallow. The classical theory, methods and technology may be partly or most entirely invalid. Accordingly, it is very important to study the basic theory of rock mechanics in deep mining engineering.
https://doi.org/10.1142/9789812772411_0004
Tunnelling in brittle rock at depth poses unique problems as stress-driven failure processes often dominate the tunnel behaviour. Such failure processes can lead to gradual ravelling or to violent, strainbursting modes of instability that cause difficult conditions for tunnel construction, whether advanced by TBM or by blasting.
The author's experience with brittle failing rock in deep mining and Alpine tunnelling was previously presented in keynote lectures at GeoEng 2000 (Kaiser et al. 2000), summarizing a decade of collaborative research work on brittle rock failure, at the Rockburst and Seismicity in Mines Symposium (Kaiser 2005), introducing new means of complex data interpretation in seismically active mines, and at GEAT'06 (Kaiser 2006), focusing on recent experiences from deep Alpine tunnelling. This article briefly summarizes findings from previous studies, presents recent developments and highlights implications that are of practical importance with respect to constructability. Guidelines for support selection in brittle failing ground are given, and brittle failure processes at the tunnel face are briefly analyzed.
https://doi.org/10.1142/9789812772411_0005
DDA (Discontinuous Deformation Analysis) originally developed by G.H. Shi is an extension of FEM in dynamic analysis. The DDA simulations have been used in some practical problems; especially for discontinuous rock masses and demands are extended to more complex simulations in rock engineering fields. However this method is not widely accepted because of insufficient information and some unknown parameters in the method. Several modifications and improvements are necessary to use the original DDA in practical application. In this paper we discussed the structure of DDA, what the key point of DDA for easy understanding is, how many parameters are used in DDA and how they are determined. Damping effects (physical damping, algorithmic damping, quasi-static and dynamic damping in DDA, time increment) are the most important parameters should be discussed in detail. Some examples of DDA application will be shown. Tunnel excavation in discontinuous rock masses, rock slope stability in earthquake conditions and 3 dimensional rock fall problems etc. are examined. These examples will clearly demonstrate the potential applicability of DDA to rock engineering problems.
https://doi.org/10.1142/9789812772411_0006
In the planning and design phases of underground structures, the information on geological setup, the rock mass structure and characteristics necessarily is incomplete and inaccurate. To allow for a safe and economical construction, a continuous updating of the ground model and an adjustment of the construction methods to the actual site conditions is required. For a smooth construction process, the conditions ahead of the face have to be predicted, and the ground surrounding the tunnel characterized. Based on this updated model the ground behaviour can be assessed, and the final layout of the construction determined. The expected interaction between ground and support (system behaviour) forms the basis for the monitoring program and the safety management plan, which includes warning and alarm criteria.
As all decisions on site have to be made quickly, data acquisition, processing and analysis have to be well organized. Highly qualified and experienced geotechnical personnel, as well as appropriate site organization and contractual conditions are required to allow for a short reaction time to changing conditions.
A number of tools and methods have been developed, which contribute to a more reliable assessment of rock mass structure and behaviour, which again enables a more precise determination of excavation and support methods. Digital stereo photos allow a precise evaluation of the rock mass structure, while advanced software for the evaluation of displacement monitoring data and prediction of displacements assists in predicting and controlling the performance of the underground structure. Up to date methods of monitoring data evaluation and interpretation will be demonstrated with the help of case histories.
A key issue is the accurate prediction of the displacements in their development and final magnitude. Appropriate software can support engineers in assessing displacements and stresses of tunnel supports.
The experience of on-site personnel in general is limited, and may not cover specific problems encountered on site. In the past experts had to be brought to the site and briefed on the conditions to solve such problems. This is slow and inefficient, as the level of information might be not sufficient or time consuming to upgrade. With the Internet nowadays an exchange of information is easy, allowing experts to give a profound advice, even if they are not on site.
https://doi.org/10.1142/9789812772411_0007
Rapid development of tunnel boring machine (TBM) technology accelerates the extensive application of TBM in rocks and various geological conditions. TBM rock tunnelling is becoming a competitive approach, to the conventional drill and blast method. Over the years, many researches have been conducted to understand the rock fragmentation mechanism by TBM cutters, and to improve and predict the TBM performance in various rock masses. However, due to the complexity of natural grounds, TBM tunnelling still faces many challenges. This keynote paper examines rock fragmentation process, influence of joints and mixed face conditions on fragmentation and cutter force differentiation. Some of the studies show a prospect for improving TBM cutter and cutterhead design. The encountered problems in complex ground during TBM tunnelling are highlighted, and elaborated with examples. Finally, the needs for future research and development are proposed.
https://doi.org/10.1142/9789812772411_0008
In this paper, we propose a protocol for evaluating the complete stress field and its variation with depth using an integrated stress determination approach. Although the strategy is based on sampling the stress field with hydraulic methods, it may be applied to most stress measuring techniques and integrated studies. It is shown that the procedure will not be hampered by difficulties reported with the individual stress measuring techniques. Our strategy is based on the directions of the ISRM suggested methods for rock stress estimation by hydraulic fracturing and hydraulic tests on pre-existing fractures (Haimson & Cornet, 2003). In addition, we pay particular attention to the sampling strategy and considerations of the continuity hypothesis.
https://doi.org/10.1142/9789812772411_0009
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https://doi.org/10.1142/9789812772411_bmatter
AUTHOR INDEX.
Sample Chapter(s)
Chapter 1: Forensic Engineering for Underground Construction (244 KB)
CD-ROM
9789812772411SM01.iso (174279 KB)
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