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Vertical response of arbitrarily shaped embedded foundations
19A stress peaks. The friction angle is modelled with a Beta distribution. Acceleration and pore pressure development within the gentle infinite slope are assumed the same as those in a horizontal deposit of the same average thickness. Finite element analyses are performed to investigate the limits of this assumption. Results from both analyses are compared to documented case histories of lateral spreading. Auth.
Rock Breakage and Excavation
861144 Vertical response of arbitrarily shaped embedded foundations Gazetas, G; Dobry, R; Tassoulas, J L J Geotech Engng Div ASCE Vl11, N6, June 1985, P750-771
861149 Blind drilling down under Richardson, P Civ Engng, N Y V55, N6, Aug 1985, P66-68
A very simple and versatile method is presented for estimating the vertical dynamic stiffness and damping coefficient of a rigid foundation with arbitrary base shape, embedded in a homogeneous half-space and with partial or complete sidewall-soil contact. The method is illustrated with a specific numerical example and is shown to be superior to approximate techniques currently available. 34 refs.
A fresh air shaft, 750m deep and 4.3m diameter, the largest hole ever blind drilled in hard rock, has been completed at the Agnew No 1 Mine, Western Australia. The rock strata encountered, metagabbro, phlogopite schist and actinolite gneiss, each caused different problems. The project was finally stopped some 220m short of intended depth, due to drill rig problems.
861145 Preliminary application of boundary element method in the ground stresses research at a tungsten mine (In Chinese) Deng, Z; Ding, J; Ye, Q Nonferr Met V37, N3, Aug 1985, P12-19
861150 Calculation and use of two drill factors from borehole survey data Tweedie, J R Min Mag Sept 1985, P232-236
The use of the boundary element method in rock mechanics is briefly discussed. Taking a tungsten mine as an example, an improved computer program is used to examine the deformation behaviour for eight double and single stopes, at different depths and different initial stress conditions. The effects of mined out areas on stope behaviour are also investigated. Calculations and long-term in situ measurements are compared.
Statistical examination has been made of borehole survey data and the factors r, radius of curvature, and E, angle of the plane of curvature, evaluated. Effects of various geological factors and mechanical variables such as drill rod type have been investigated. A mathematical simulation of a borehole is proposed, based on average values of r and E and estimated geology, to examine the effects of different geological models on final end of hole position and length of borehole to reach a target, and thus likely time and cost.
861146 Application of integral equations and finite element methods in combination with force and displacement methods for the design of tunnels (In German) Glahn, H Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P63-68. Publ Essen." German Society for Soil Mechanics and Foundation Engineering, 1985 861147 Stability analyses of near surface tunnels (In German) Pierau, B Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P85-91. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 A three dimensional finite element analysis is presented which can simulate the tunnelling process at a realistic computing cost. It is illustrated by reference to the example of a two-track railway tunnel. An initial indication of working face stability can be obtained from results of analyses based on an elastic stress-strain relationship.
861148 Problem of the two-dimensional calculation of the stresses in the tunnel lining taking into account the influence of the heading face by finite element method Hristov, T; Vassilev, V Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P105-107. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 The stress state in the zone around a tunnel heading and the deformation in this area influence the stress on tunnel linings. A two dimensional finite element model can be used to simulate change in the natural stress state, by appropriate reduction of the modulus of elasticity of the rock mass around the face.
Drilling
861151 Status on studies of rock drillabiHty (In Chinese) Lai, H Nonferr Met V37, N3, Aug 1985, P20-25 A brief review of work done outside China since 1950 concerning rock driilability. It is mainly concerned with small to medium size holes.
861152 Application of raise drilling on the Salto de Moralets hydroelectric project Mirasol, E Proc of the Eurotunnel '83 Conference, Basle, 22-24 June 1983 P97-101. Publ Marlow: Access Conferences Ltd, 1983 Due to unexpected geological difficulties, the construction method for the inclined 1000m penstock at a 45 deg angle, on the Salto de Moralets Hydroproject was changed from conventional raising to the application of a raise drill. Details of the project, problems encountered, the raise drill solution and description of the raise drilling are given. This is one of the first attempts at using a raise drill for the precision directional drilling of an inclined pilot bore.
861153 Prediction of roadheader performance from penetration rates of percussive drills: some applications to Turkish coalfields Bilgin, N Proc of the Eurotunnel '83 Conference, Basle, 22-24 June 1983 P111-114. Publ Marlow: Access Conferences Ltd, 1983 A major research project carried out for the Turkish Scientific and Research Council examines the selection of roadheaders. Penetration rates of percussive drill bits were measured in different roadways in different regions of the Zonguldak coalfield. Statistical analysis of the results of the cuttability
Rock Breakage and Excavation
861144 Vertical response of arbitrarily shaped embedded foundations Gazetas, G; Dobry, R; Tassoulas, J L J Geotech Engng Div ASCE Vl11, N6, June 1985, P750-771
861149 Blind drilling down under Richardson, P Civ Engng, N Y V55, N6, Aug 1985, P66-68
A very simple and versatile method is presented for estimating the vertical dynamic stiffness and damping coefficient of a rigid foundation with arbitrary base shape, embedded in a homogeneous half-space and with partial or complete sidewall-soil contact. The method is illustrated with a specific numerical example and is shown to be superior to approximate techniques currently available. 34 refs.
A fresh air shaft, 750m deep and 4.3m diameter, the largest hole ever blind drilled in hard rock, has been completed at the Agnew No 1 Mine, Western Australia. The rock strata encountered, metagabbro, phlogopite schist and actinolite gneiss, each caused different problems. The project was finally stopped some 220m short of intended depth, due to drill rig problems.
861145 Preliminary application of boundary element method in the ground stresses research at a tungsten mine (In Chinese) Deng, Z; Ding, J; Ye, Q Nonferr Met V37, N3, Aug 1985, P12-19
861150 Calculation and use of two drill factors from borehole survey data Tweedie, J R Min Mag Sept 1985, P232-236
The use of the boundary element method in rock mechanics is briefly discussed. Taking a tungsten mine as an example, an improved computer program is used to examine the deformation behaviour for eight double and single stopes, at different depths and different initial stress conditions. The effects of mined out areas on stope behaviour are also investigated. Calculations and long-term in situ measurements are compared.
Statistical examination has been made of borehole survey data and the factors r, radius of curvature, and E, angle of the plane of curvature, evaluated. Effects of various geological factors and mechanical variables such as drill rod type have been investigated. A mathematical simulation of a borehole is proposed, based on average values of r and E and estimated geology, to examine the effects of different geological models on final end of hole position and length of borehole to reach a target, and thus likely time and cost.
861146 Application of integral equations and finite element methods in combination with force and displacement methods for the design of tunnels (In German) Glahn, H Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P63-68. Publ Essen." German Society for Soil Mechanics and Foundation Engineering, 1985 861147 Stability analyses of near surface tunnels (In German) Pierau, B Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P85-91. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 A three dimensional finite element analysis is presented which can simulate the tunnelling process at a realistic computing cost. It is illustrated by reference to the example of a two-track railway tunnel. An initial indication of working face stability can be obtained from results of analyses based on an elastic stress-strain relationship.
861148 Problem of the two-dimensional calculation of the stresses in the tunnel lining taking into account the influence of the heading face by finite element method Hristov, T; Vassilev, V Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P105-107. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 The stress state in the zone around a tunnel heading and the deformation in this area influence the stress on tunnel linings. A two dimensional finite element model can be used to simulate change in the natural stress state, by appropriate reduction of the modulus of elasticity of the rock mass around the face.
Drilling
861151 Status on studies of rock drillabiHty (In Chinese) Lai, H Nonferr Met V37, N3, Aug 1985, P20-25 A brief review of work done outside China since 1950 concerning rock driilability. It is mainly concerned with small to medium size holes.
861152 Application of raise drilling on the Salto de Moralets hydroelectric project Mirasol, E Proc of the Eurotunnel '83 Conference, Basle, 22-24 June 1983 P97-101. Publ Marlow: Access Conferences Ltd, 1983 Due to unexpected geological difficulties, the construction method for the inclined 1000m penstock at a 45 deg angle, on the Salto de Moralets Hydroproject was changed from conventional raising to the application of a raise drill. Details of the project, problems encountered, the raise drill solution and description of the raise drilling are given. This is one of the first attempts at using a raise drill for the precision directional drilling of an inclined pilot bore.
861153 Prediction of roadheader performance from penetration rates of percussive drills: some applications to Turkish coalfields Bilgin, N Proc of the Eurotunnel '83 Conference, Basle, 22-24 June 1983 P111-114. Publ Marlow: Access Conferences Ltd, 1983 A major research project carried out for the Turkish Scientific and Research Council examines the selection of roadheaders. Penetration rates of percussive drill bits were measured in different roadways in different regions of the Zonguldak coalfield. Statistical analysis of the results of the cuttability