1 Rock Engineering Issues & Choosing Equipment Stan Vitton, PE, PhD Michigan Technological University Department of Civil & Environmental Engineering Rock Foundation Issues Determination of Top of Rock Methods of Excavation Rock Drainage and Frost Potential On Site Rock Testing and Inspection Rock Surface Completion for Foundation Members Rock Foundation Issues Determination of Top of Rock Methods of Excavation Rock Drainage and Frost Potential On Site Rock Testing and Inspection Rock Surface Completion for Foundation Members Depth to Bedrock???? Soil Rock General The purpose of this Directive is to outline the Fund’s minimum requirements for the consultant relative to the identification, definition and specifications for rock removal during design and construction. The objective is to identify comprehensive and biddable quantities of rock in order to accurately identify costs related to its removal during construction. State University Construction Fund Rock Excavation Directive Policy The Consultant shall, as an extra work authorization, retain the services of a qualified geotechnical engineer and testing agency to identify, quantify and evaluate the extent and nature of rock removal associated with all aspects of a project. These investigations shall be performed for all new construction, building additions and sitework projects. If the Consultant feels there is adequate information to not perform these investigations, he may make a recommendation to the Fund. To do so however does not relieve the Consultant of such design responsibilities during design and construction. State University Construction Fund Rock Excavation Directive
Transcript
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Rock Engineering Issues &Choosing Equipment
Stan Vitton, PE, PhDMichigan Technological UniversityDepartment of Civil & Environmental Engineering
Rock Foundation Issues
Determination of Top of Rock
Methods of Excavation
Rock Drainage and Frost Potential
On Site Rock Testing and Inspection
Rock Surface Completion for Foundation Members
Rock Foundation Issues
Determination of Top of Rock
Methods of Excavation
Rock Drainage and Frost Potential
On Site Rock Testing and Inspection
Rock Surface Completion for Foundation Members
Depth to Bedrock????
Soil
Rock
GeneralThe purpose of this Directive is to outline the
Fund’s minimum requirements for the consultant relative to the identification, definition and specifications for rock removal during design and construction. The objective is to identify comprehensive and biddable quantities of rock in order to accurately identify costs related to its removal during construction.
State University Construction Fund Rock Excavation Directive
Policy
The Consultant shall, as an extra work authorization, retain theservices of a qualified geotechnical engineer and testing agencyto identify, quantify and evaluate the extent and nature of rockremoval associated with all aspects of a project. These investigations shall be performed for all new construction, building additions and sitework projects.
If the Consultant feels there is adequate information to not perform these investigations, he may make a recommendation to the Fund. To do so however does not relieve the Consultant of such design responsibilities during design and construction.
State University Construction Fund Rock Excavation Directive
2
It is expected that reports and recommendations generated from field investigation be bound in the Project Manual as Supplemental Information. However such reports typically provide soil logs and offer recommendations as to how rock removal is to be addressed during construction. In order for these recommendations to be properly considered as part of the contract requirements such information (locations, quantities, etc) and recommendations must be incorporated into the plans and technical specifications. The information in the Supplemental Information does not override the contact plans and specifications.
State University Construction Fund Rock Excavation Directive
State University Construction Fund Rock Excavation Directive
Where rock removal is anticipated, it is expected that the soil information will permit a responsible and accurate forecast of the chance of encountering rock and the estimated amount involved. It is the Consultant’s responsibility:
To determine the need for consideration of rock excavation,To define what is to be considered rock at the particular campus,To properly address the handling of rock in the contract documents,To reflect the costs of the rock in his cost estimates.
Method of Excavation?General soil removal equipment
Ripping
Drill and blasting
Rock Testing!
Mechanical Testing of Rock CoresTest Hole TH-7MDOT Structure B02 of 22023 US-2 Over Sturgeon RiverDickenson County, Michigan
Excavation
The real question is not necessarily the depth to bedrock but….
How much material will require ripping or blasting?What equipment or type of blasting that will be required?How long will it take?And what will it cost?
