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Load Transfer to Micro Pile Rock Socket
A typical micropile section above a rock socket consists of a steel core, grout surrounding the core, and pipe casing installed through overburden then a short distance into rock. Within the rock socket, the only structural components are the core and grout. The pipe casing is usually left in the ground. The permissible stresses in the three components are specified by code. For example, the New York City code requires no more then 50% and 35% of ultimate steel stress to be used for the core and casing pipe respectively. 33% of grout compressive strength can be used as allowable. The codes are usually silent of treatment of permissible load in the rock socket as the casing pipe stops a short distance (typically less than 30 cm) below top of rock. Some designers ignore the contribution of the casing pipe while others allow for end bearing of the steel section (typically less than 10 tons) to be added to the socket core and grout load. In this paper an attempt is made to quantify (by analysis) the factors that control the load transferred to the socket after load dissipation through end bearing of the pipe steel section.
Load Transfer to Micro Pile Rock Socket
A typical micropile section above a rock socket consists of a steel core, grout surrounding the core, and pipe casing installed through overburden then a short distance into rock. Within the rock socket, the only structural components are the core and grout. The pipe casing is usually left in the ground. The permissible stresses in the three components are specified by code. For example, the New York City code requires no more then 50% and 35% of ultimate steel stress to be used for the core and casing pipe respectively. 33% of grout compressive strength can be used as allowable. The codes are usually silent of treatment of permissible load in the rock socket as the casing pipe stops a short distance (typically less than 30 cm) below top of rock. Some designers ignore the contribution of the casing pipe while others allow for end bearing of the steel section (typically less than 10 tons) to be added to the socket core and grout load. In this paper an attempt is made to quantify (by analysis) the factors that control the load transferred to the socket after load dissipation through end bearing of the pipe steel section.
Load Transfer to Micro Pile Rock Socket
Oweis, Issa (author) / Hwang, Jeaan (author)
GeoFlorida 2010 ; 2010 ; Orlando, Florida, United States
GeoFlorida 2010 ; 234-243
2010-02-15
Conference paper
Electronic Resource
English
Load Transfer to Micro Pile Rock Socket
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