We consider the nucleation of instability on a slip‐weakening fault subjected to heterogeneous, locally peaked “loading” stress. That stress is assumed not only gradually increase due tectonic loading but also retain its character. The case linear versus slip law considered in framework two‐dimensional quasi‐static elasticity for planar fault. Slip initiates when peak first reaches strength level start weakening. Then size slipping region grows under increased until finally critical length...

The dynamic behaviour of underground structures built by cut-and-cover methods is discussed. A simple model analysis shows that a column supporting the overburden at midspan (central column) can resonate upon incidence an elastic wave specific frequency. analytical results indicate not only size and material properties column, but also static load acting on (overburden) decisive factor influences resonant Based obtained analysis, mechanism failure Daikai Underground Station in Kobe caused...

Abstract— This paper gives a brief review of research in rock fracture mechanics as conducted at the Fracture and Photo‐Mechanics Laboratory (FPML) Vienna University Technology. The mechanisms pertaining to percussion drilling blasting are investigated, with specific reference application mechanics. In order gain an improved understanding controlling fragmentation, multidisciplinary approach is followed which includes laboratory experiments plexiglass rock, in‐situ field analytical/numerical...

Abstract This contribution presents an introduction into that part of the field elastic wave propagation which is relevant to blasting single and multiple boreholes addresses briefly borehole breakdown formation fracture network around a ultimately leads disintegration rock mass. Phenomena this kind are encountered in mining quarrying. Analytical as well numerical work referring stress expansion from detonating will be addressed detail. Much research reported here has been performed at...

This contribution addresses the effect of a surface wave on dynamic behavior slope. In particular, interaction Rayleigh wave, possibly generated by an earthquake or nearby blasting, with simple wedge-shaped slope is considered. A two-dimensional elastodynamic analysis suggests that amplitudes and phase shifts waves reflected transmitted at crest strongly depends inclination face, superimposition incident may induce large stress amplification thus produce open cracks in top The computational...

In this contribution, field experiments of dynamic fracture by electric discharge impulses (EDI) are performed and development in rectangular concrete blocks with reinforcing steels bars is analyzed also numerically the three-dimensional context. It found that network depends very sensitively on geometrical settings (e.g. positions empty dummy holes prepared for controlling crack propagation directions) blocks, cracks extending from blast may tend to arrest (pre-)existing planes weakness...

Permeable membranes (PMs), which are air-permeable fabrics made from various natural or chemical fibers that thinly woven non-woven, attractive sound-absorbing materials. The simplest PM absorber is a single-leaf (PMSG) with non-locally reacting rigid backed air cavity in placed front of rigidly cavity. A honeycomb-backed (PMHC), has locally cavity, also well known. However, the two absorbers have shortcomings their diffuse field absorption coefficients attrib- utable to backing design. To...

Scattering of elastic waves by structural inhomogeneities such as cylindrical cavities has been a subject intensive study for decades. The time-harmonic elastodynamic analysis making use the wave function expansions is one typical approaches problems, and since it gives semianalytical solutions that may show effect parameters problem rather explicitly, still repeatedly used in dynamic response structures including inhomogeneities. Here, motivated observation unique underground failure...

This contribution treats a long standing enigma of the strong vertical shock, often felt near an epicenter on onset seismic shaking but not recorded by seismographs. Beginning with 1995 Hyogo-ken Nanbu (Kobe), Japan, earthquake, only verbal evidences number people for various earthquakes at different places also unique dynamic failures induced in underground and surface structures do support idea existence such shock generated relatively shallow earthquakes. However, due to lack capability...

Abstract In Part I of this contribution (Rossmanith et al. 1997), elastic wave propagation in monolithic rock which is relevant to blasting single boreholes has been investigated analytically and numerically. The main emphasis put on the effect velocity detonation stress propagation. II (this article) addresses numerical results concerning expansion from a detonating borehole interaction with geological features discontinuity such as interfaces, layers, cracks faults.

Abstract We present an experimental and numerical investigation of the interaction a Rayleigh (R) pulse with partially contacting strike-slip fault between similar dissimilar materials. This study is intended to offer improved understanding earthquake rupture mechanisms. The subjected static normal shear prestresses. Utilizing two-dimensional dynamic photoelasticity in conjunction high-speed cinematography, evolution time-dependent isochromatic fringe patterns (contours maximum in-plane...

Spalling is a wave-induced dynamic fracture phenomenon. The waves can be either one: elastic, elasto-plastic, or shock waves. From continuum mechanics point of view, and wave propagation form the main ingredients in formation spalls. Recently, however, micro-structural effects have become important initial stages spall variety engineering materials ranging from metals to rock concrete. structural geology mass cannot modelled as continuum. In this case, discontinuum approach has taken where...