U.S. Bureau of Mines
A number of recent advances in finite element theory and computer technology are combined into a computer program for analysing structures and cavities in rock. The program applies to general three-dimensional forms, considers non-linear material properties including joints, anisotropic and time-dependent material properties, gravity loading and sequence of construction or excavator. Example problems, demonstrating the ability of the program to reproduce ideal situations having closed-form, analytic solutions are solved.
Carl Philip Benson
Virginia Polytechnic Institute
A review of behavioural rock properties used for input to the finite element method are summarized. Rock properties presented in the literature were primarily obtained from laboratory specimens. Methods to determine applicable field properties via testing , calculations and empirical correlations are included. Suggested behavioural properties of the structural concrete-to-rock interface are proposed. Specific property values, resulting from the literature review, are presented as input for a finite element parametric evaluation of navigation structures .
This handbook is specifically designed as a guide to highway engineers and blasting practitioners working with highway applications. It was used as a handbook for the FHWA courses of the above title. The handbook is a basic review of explosives and their characteristics, along with explosive selection criteria. Initiations and timing effects as well as patterns are also discussed.
A simple step by step procedure is outlined to help the engineer review blasting submittals in a systematic fashion. Air blast and ground vibration are discussed along with methods for evaluation and control. Several solved examples are presented in a manner to simplify the necessary calculations with step by step procedures given where appropriate.
We also offer the companion software RocLab for Windows 95/98/Me/NT/XP, which includes online help and instructions.
A complete treatment on the subject. Topics include the following:
- Development of Rock Engineering
- When is a rock engineering design acceptable
- Rock mass classification
- Shear strength of discontinuities
- Structurally controlled instability in tunnels
- The Rio Grande project–Argentina
- A slope stability problem in Hong Kong
- Factor of safety and probability of failure
- Analysis of rock fall hazards
- In situ and induced stresses
- Rock mass properties
- Tunnels in weak rock
- Large powerhouse caverns in weak rock
- Rock bolts and cables
- Shotcrete support
- Blasting damage in rock
30 November 1994
This manual is intended to provide, where possible, a guided approach for the design of rock foundations. The concept of guided design provides for a stepped procedure for solving engineering problems that requires solution by decision making and judgement. Any design which involves rock masses requires a decision making process in which information must be obtained, considered, and reconciled before decisions and judgements can be made and supported. As such, the manual provides a stepped procedure for planning, collecting, and characterizing the information required to make intelligent decisions and value judgements concerning subsurface conditions, properties, and behaviour. A fully coordinated team of geotechnical and structural engineers and engineering geologists are required to insure that rock foundation conditions and design are properly integrated into the overall design of the structure and that the completed final design of the structure is safe, efficient, and economical. Foundation characterization and design work should be guided by appropriate principles of rock mechanics.
Lawrence A. Pierson, C.E.G. and Robert Van Vickle, R.P.G.
Development of the Rockfall Hazard Rating System (RHRS) is complete. The system has been fully tested and implemented by the Oregon Department of Transportation. The RHRS is a process used in the management of rockfall sites adjacent to highways. The system is proactive by design, providing a rational way to make informed decisions on where and how to spend construction funds in order to reduce the risks associated with rockfall.
This Participant’s Manual documents the components of the RHRS, the steps an agency should follow to implement the system, and discusses the level of commitment required. The benefits of implementation and the limitations of the system are also described. The manual serves as both a field guide and as a desk top reference for those who perform the slope ratings and those who use the resulting database in establishing rockfall remediation designs and construction priorities.