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ultrasonic wave propagation in discontinous rock
Experiments were carried out to determine the effect of discontinuities on the propagation of ultrasonic waves in samples of chalk and sandstone obtained from tunnel sites at Chinnor, Oxfordshire and Warrington, Cheshire respectively. In particular the effect of normal stress across a closed discontinuity was investigated. Tests to determine the wave velocity, attenuation coefficients and the e…
The effects of ground vibration during bentonite shield tunnelling at Warrington
The maximum measured ground vibration (expressed in terms of resultant peak particle velocity) was 3.9 mm/s. The vibration was characterised by random high velocity particle motions resulting from impacts between the machine's disc cutters and glacial boulders in the tunnel face. Surface and subsurface settlement measurements were made along the tunnel line. Laboratory tests and other field dat…
NEW CIVIL ENGINEER CONFERENCE: Compaction Technology=Teknologi Pemadatan
Ruang Koleksi Umum Rak: 3
Education for Librarianship: Decision in Organising a System of Professional …
"Education for Librarianship: Decisions in Organising a System of Professional Education" refers to a foundational book by Peter G. New, focusing on the strategic planning and core principles (access, ethics, technology) needed to structure librarian training, addressing shifts from traditional roles to modern information management, emphasizing practical skills, lifelong learning, and the evol…
SEEPAGE IN SOILS: Principles and Applications
The book contains a broad range of applications with rigorous quantitative skills to give insight into the fundamental principles and mathematical solutions of seepage. A wealth of closed-form analytical solutions are provided to solve a variety of problems, minimizing the use of computer software and numerical models. It also covers new developments in separators, filters and geosynthetics inc…
Flexural Resistance of Longitudinally Stiffened I-Girders. I: Yield Limit State
Abstract: The current AASHTO specification requirements for the web bend-buckling strength-reduction factor (Rb) do not consider the influence of longitudinal stiffeners on the flexural resistance of steel I-girders subsequent to the theoretical bend-buckling of a slender web. This is a deficiency that can have significant impact, especially in regions of continuous-span girders subjected to …
Flexural Resistance of Longitudinally Stiffened I-Girders. II: LTB and FLB Li…
Abstract: The current AASHTO specifications impose a penalty on the strengths corresponding to the compression flange in slender-web cross sections due to bend-buckling of the web in flexural compression. This web bend-buckling factor (Rb) does not account for any potential benefits from the influence of web longitudinal stiffening. In a companion paper, the authors developed a cross-section …
