- Email: [email protected]
Development of the friction meter for evaluating the skin friction of a pile. Technical note
244A 866232 Behavionr of an impermeable flexible raft on a deep layer of unconsolidated soil Booker. J R: Small. J C lnt J Num Anal Meth Geomech VIO. N3. May-June 1986. P311-327
Analytic solutions to the problem of the time settlement behaviour of raft foundations have been limited in the past to flexible or rigid Ioadings and have treated the foundation as being completely permeable. Solutions are presented here for smooth circular rafts of any flexibility causing consolidation of a deep homogeneous clay layer, where the raft may be considered permeable or impermeable. Results of the time dependent behaviour of contact stresses, pore pressures, raft displacements and moment in the raft are presented. Auth, 866233 Uncertainty about p-y curves for piles in soft clays Ruiz, S E J Geotech Engng Dit, A S C E VII2. N6. June 1986. P594-607
Criteria for estimating the first two probabilistic moments of the normalized parameters of p-y curves are presented. These parameters are the ultimate soil reststance and the initial tangent value of the soil reaction, which are both normalized with respect to the values predicted by an adequate mathematical expression. Data about soft saturated clays have been analyzed using a Bayesian sequential method, to account for the influence of uncertainty in soil properties. When assessing the possible deviations of the normalized variables, attention is given to: uncertainty attached to the prediction formula of the p-y curves: influence of uncertainty in basic soil properties: and discrepancies among results from small scale models and field tests. Mean and wlria nce values of the normalized parameters of p-y curves corresponding to soft and medium saturated clays are obtained for a particular case. 866234 Dynamic lateral response of piles in coupled mode of vibration Saha. S: Ghosh. D P Soils Found V26. N1. March 1986. PI-IO
An approximate numerical solution, using the finite difference method, is proposed for dynamic analysis of piles subjected to coupled horizontal and rotational vibration. Results arc in good agreement with experimental measurements and other available theoretical solutions. The stiffness and damping parameters predicted are frequency dependent, and vary with slenderness ratio up to approximately I/r=30. These parameters can be applied to pile supported footings undergoing coupled mode vibration 866235 Development of the friction meter for evaluating the skin friction of a pile. Technical note Kishida, T: Fukaya, T: Hanzawa, H Soils Found V26. NI, March 1986. PI22-128
A friction meter has been developed to evaluate factors affecting pile friction and allow its estimation without resorting to expensive load testing. Its use in mudstone, dense sand and hard clay is described. Comparison is made between skin friction measured from load testing and estimated by use of the friction meter in hard clay. Results are in good agreement provided compensation is made for pile surface roughness effects.
866236 Coupled finite element layer formulation for analysis of foundation problems Parikh. S K: Pathak. S P Proc 5th International Conference on Numerical ~Wethods in Geomechanics. Nagoya, 1-5 April 1985 VI. P221-228. Pui~l Rotterdam: A. ,4 Balkema. 1985
tn the analysis of foundation substructures, the idealisation of the soil mass through a finite layer system presents a problem. mainly because the substructural ssstem would invariably require a finite element formulation, The problem therefore involves complex interaction between a finite element field and a finite layer field. The coupled problem of this kind can be solved through iterative procedures. An iterativc solution method for the coupled problem is discussed and results demonstrating its success are presented. The proposed method requires less solution time than that required in the case of the complete finite element formulation. Auth
866237 Geotechnical aspects of 3.5m diameter drilled piles for the Saudi Arabia-Bahrain causeway Tonnisen. J Y: Dobic. M J D Proc 8th Southeast Asian Geotechnical Conference. Kuala Lumpur, Malaysia, 11-15 March 1985 VI. PI 22-39. Puhl Kuala Lumpur." Organising Committee. 1986
This project included 12.5kin of bridges, founded for the most part on 3.5m diameter precast concrete piles. Comprehensive site investigation was carried out on the superficial Quaternary layers, very stiff clay to weak rock~ and the underlying Tertiary layers, mudstones, siltstoncs and sandstones. Boreholcs were drilled at each pile location. Laboratory and field tests included pressuremeter tests, unconfined compression tests, index tests, triaxial tests and consolidation tests, Pile deflection models were developed using linear springs, and good agreement was found between predicted deformation values and site loading tests. The piles were successfully installed using specially designed equipment and techniques.
866238 Clay crusts of the Sunda Shelf - a hazard to jack-up operations Castleberry. J P: Prebaharan, N Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, ~lala),sia, 11-15 March 1985 VI. PI 40-48. Puhl Kuala Lumpur. Organising Committee. 1986
Clay crusts, produced by weathering during the period of Pleistocene glaciation, often occur with clays o f the southeast Asian Sunda Shelf. at depths less than 20ft below seafloor. The development of these crusts is described, and their geotechnical properties, measured from data from 452 borings, ts reported. The clays are characterised b y oxidation related features and high shear strength, and may support a footing under initial conditions but fail in a punch-through mode under full preload. Methods of avoiding punch-through failure and procedures for predicting footing performance are discussed
1986 Pergamon Journals Ltd. Reproduction not permitted
Analytic solutions to the problem of the time settlement behaviour of raft foundations have been limited in the past to flexible or rigid Ioadings and have treated the foundation as being completely permeable. Solutions are presented here for smooth circular rafts of any flexibility causing consolidation of a deep homogeneous clay layer, where the raft may be considered permeable or impermeable. Results of the time dependent behaviour of contact stresses, pore pressures, raft displacements and moment in the raft are presented. Auth, 866233 Uncertainty about p-y curves for piles in soft clays Ruiz, S E J Geotech Engng Dit, A S C E VII2. N6. June 1986. P594-607
Criteria for estimating the first two probabilistic moments of the normalized parameters of p-y curves are presented. These parameters are the ultimate soil reststance and the initial tangent value of the soil reaction, which are both normalized with respect to the values predicted by an adequate mathematical expression. Data about soft saturated clays have been analyzed using a Bayesian sequential method, to account for the influence of uncertainty in soil properties. When assessing the possible deviations of the normalized variables, attention is given to: uncertainty attached to the prediction formula of the p-y curves: influence of uncertainty in basic soil properties: and discrepancies among results from small scale models and field tests. Mean and wlria nce values of the normalized parameters of p-y curves corresponding to soft and medium saturated clays are obtained for a particular case. 866234 Dynamic lateral response of piles in coupled mode of vibration Saha. S: Ghosh. D P Soils Found V26. N1. March 1986. PI-IO
An approximate numerical solution, using the finite difference method, is proposed for dynamic analysis of piles subjected to coupled horizontal and rotational vibration. Results arc in good agreement with experimental measurements and other available theoretical solutions. The stiffness and damping parameters predicted are frequency dependent, and vary with slenderness ratio up to approximately I/r=30. These parameters can be applied to pile supported footings undergoing coupled mode vibration 866235 Development of the friction meter for evaluating the skin friction of a pile. Technical note Kishida, T: Fukaya, T: Hanzawa, H Soils Found V26. NI, March 1986. PI22-128
A friction meter has been developed to evaluate factors affecting pile friction and allow its estimation without resorting to expensive load testing. Its use in mudstone, dense sand and hard clay is described. Comparison is made between skin friction measured from load testing and estimated by use of the friction meter in hard clay. Results are in good agreement provided compensation is made for pile surface roughness effects.
866236 Coupled finite element layer formulation for analysis of foundation problems Parikh. S K: Pathak. S P Proc 5th International Conference on Numerical ~Wethods in Geomechanics. Nagoya, 1-5 April 1985 VI. P221-228. Pui~l Rotterdam: A. ,4 Balkema. 1985
tn the analysis of foundation substructures, the idealisation of the soil mass through a finite layer system presents a problem. mainly because the substructural ssstem would invariably require a finite element formulation, The problem therefore involves complex interaction between a finite element field and a finite layer field. The coupled problem of this kind can be solved through iterative procedures. An iterativc solution method for the coupled problem is discussed and results demonstrating its success are presented. The proposed method requires less solution time than that required in the case of the complete finite element formulation. Auth
866237 Geotechnical aspects of 3.5m diameter drilled piles for the Saudi Arabia-Bahrain causeway Tonnisen. J Y: Dobic. M J D Proc 8th Southeast Asian Geotechnical Conference. Kuala Lumpur, Malaysia, 11-15 March 1985 VI. PI 22-39. Puhl Kuala Lumpur." Organising Committee. 1986
This project included 12.5kin of bridges, founded for the most part on 3.5m diameter precast concrete piles. Comprehensive site investigation was carried out on the superficial Quaternary layers, very stiff clay to weak rock~ and the underlying Tertiary layers, mudstones, siltstoncs and sandstones. Boreholcs were drilled at each pile location. Laboratory and field tests included pressuremeter tests, unconfined compression tests, index tests, triaxial tests and consolidation tests, Pile deflection models were developed using linear springs, and good agreement was found between predicted deformation values and site loading tests. The piles were successfully installed using specially designed equipment and techniques.
866238 Clay crusts of the Sunda Shelf - a hazard to jack-up operations Castleberry. J P: Prebaharan, N Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, ~lala),sia, 11-15 March 1985 VI. PI 40-48. Puhl Kuala Lumpur. Organising Committee. 1986
Clay crusts, produced by weathering during the period of Pleistocene glaciation, often occur with clays o f the southeast Asian Sunda Shelf. at depths less than 20ft below seafloor. The development of these crusts is described, and their geotechnical properties, measured from data from 452 borings, ts reported. The clays are characterised b y oxidation related features and high shear strength, and may support a footing under initial conditions but fail in a punch-through mode under full preload. Methods of avoiding punch-through failure and procedures for predicting footing performance are discussed
1986 Pergamon Journals Ltd. Reproduction not permitted