... ABSTRACT: Selecting an optimal tunnel support system is still difficult in weak rock and high stress environments. Using field results combined with numerical modelling and analytical analysis from the Daliang railway tunnel in West China, this paper examines the economic and mechanical...

... the failure plane through intact rock while structural failure strength represented failure through preexisting bedding, fracture or joint plane. The rock groups at the site was broadly classified into three (3) rock group category (A-Limestone, B-Weak rocks and C-Breccia) based on point load strength. Only...

... Abstract: Artificial ground freezing continues to prove as an effective approach to successful underground excavations in weak rock mass 11conditions. Numerous mining and civil projects use artificial freezing worldwide; however uncertainties remain with respect to understanding...

... ABSTRACT: Despite recent progress, there are still fundamental deficiencies in recognition, prediction, and mitigation of underground construction hazards associated with complex geological conditions in weak rock and soil works. These fundamental deficiencies that exist in regards to design...

...]. Therefore, laboratory work was carried out in the University of Nottingham to obtain the stress-strain properties for weak materials. Reservoir Characterization strength weak rock characteristic shear strength structural geology coal plane compressive strength friction angle Upstream Oil...

... failure. 1. LITERATURE REVIEW Difficulty of testing weak rocks has been recognized in the literature of geotechnical and geomechanical research. Versluis and Lindner [1] concluded that material behavior and instrumentation in hard rock media is significantly different from weak rocks. They also...

... and radiolarite rock fragments in a clay matrix; according to field strength estimates, the rock is classified as a "very weak rock". Laboratory tests were performed according to ASTM standards and ISRM suggested methods on high quality core samples from tunnel-axis vertical boreholes. Results from the field...

... in the construction of more than 50 wine caves in Napa Valley, most of which have been built in the last 30 years. construction sequence wine cave vault weak rock arched support frame shotcrete lining sequence winery car museum excavation construction low cover tunnel dome initial support...

... ABSTRACT: Derivation of the Hoek-Brown intact rock parameters (constant mi and uniaxial compressive strength óci) is more problematic for weak rock than for high-strength materials. This paper applies the results of laboratory strength testing of some New Zealand weak (i.e. qu<25 MPa...

... in soil. The elasto-plastic soil/rock response under lateral loads and the linearly variation of deformation modulus of soil/rock along depth were assumed. However, the elasto-plastic solution can not capture the nonlinearity of weak rock. Reese [5] proposed an interim p-y criterion for p-y analysis...

... cave weak rock span excavation Ground Support full overburden pressure numerical model construction tunnel dome California Rock Mechanics in the National Interest, Elsworth, Tinucoi & Heasley (eds), © 2001 Swets & Zeitlinger Lisse, ISBN 902651 827 7 Design and construction of a large...

... ABSTRACT: A series of pre-bored pressuremeter tests (PMT) were performed in relativelyoung, weak rock deposits at several test sites in Taiwan. Equipment used included the M?nard type tri-cell pressuremeter and Cambridge high-pressure dilatometer. The test dam were interpreted using some...

... ABSTRACT: Single anchor and anchor-pedestal foundation pullout tests were performed for cometion of tower foundations on a new 500 kV electrical transmission line. Hard soil and weak rock shear capacities determined from testing were compared to geotechnical data that included seismic wave...

... Characterization Texas weak rock Performance Comparison CaseHistoryAward Priscilla P. Nelson, (The University of Texas, Austin). Performance comparisonsfor tunneling projects in weak rock. Proceedings.of 28th Symposiumon Rock Mechanics,Tucson. pp. 32a-33b, 1987. ABSTRACT: Case histories for small diameter...

... and monitoring. The emphasis is placed on the importance of the stress-strain behavior for the determination of the MAC for weak rocks. INTRODUCTION In the consideration of the tunnel stability and the determination of support it is necessary to improve the understanding of rock support interaction...

... INTRODUCTION The committee on Rock Mechanics, Japanese Society for Civil Engineers, has been discussing 'soft rock engineering in Japan' and presented several papers concerning dam, tunnel, bridge and slope constructions to International Symposium on Weak Rock, Tokyo 1981...