Construction: Difference between revisions

Revision as of 15:43, 16 December 2022

Construction of an embankment dam.

"The design of an earth or rock-fill dam is a process continued until construction is completed. Much additional information on the characteristics of foundations and abutments is obtained during clearing, stripping, and trenching operations, which may confirm or contradict design assumptions based on earlier geologic studies and subsurface exploration by drill holes and test pits. Operations in the borrow areas and in required excavations also provide much data pertinent to characteristics of fill material and of excavated slopes. Weather and groundwater conditions during construction may significantly alter water contents of proposed fill material, or create seepage and/or hydraulic conditions, necessitating modifications in design. Projects must be continuously evaluated and “re-engineered,” as required, during construction, to ensure that the final design is compatible with conditions encountered during construction. Design and design review personnel will make construction site visits to determine whether design modifications are required to meet actual field conditions (see ER 1110-2-112). Environmental considerations discussed in paragraph 2-5 must be given attention in construction operations. "^[1]

Roles and Responsibilities

Types of Construction Activities

Construction Management Services

Citations:

↑ General Design and Construction Considerations for Earth and Rock-Fill Dams (EM 1110-2-2300), USACE

Revision ID: 5800
Revision Date: 12/16/2022

[EM2300-1] General Design and Construction Considerations for Earth and Rock-Fill Dams (EM 1110-2-2300), USACE

[1]

@@ Line 12: / Line 12: @@
 <!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->
-"Some of the potential problems that could occur during construction can be reduced by clear, concise specifications and clear, concise instructions to contract administration personnel regarding design assumptions and reasons for design requirements.  This information is usually conveyed in the [[Construction Considerations|construction considerations]] document that is prepared by the design staff for the construction staff.  Because most of this information is also valuable to the contractor, the current policy is to include [[Construction Considerations|construction considerations]] and the basis for various assumptions in applicable sections of the specifications.  For example, geologic and [[engineering]] reasons for specifying excavation to particular surfaces for the foundation of the dam should be included in the specification section on foundation excavation.  Confidence in the information on which the requirements are based should also be conveyed in the specifications.  When this type of information is provided in the applicable technical paragraphs of the specifications, it gives prospective bidders a clearer, more informed basis for preparing their bid and, therefore, a better opportunity for a more responsive bid, which results in less likelihood that claim situations will develop.  It also minimizes the possibility that the contractor will deny lack of knowledge of information that was essential to preparation of the bid."<ref name="DS13-10">[[Design Standards No. 13: Embankment Dams (Ch. 10: Embankment Construction) | Design Standards No. 13: Embankment Dams (Ch. 10: Embankment Construction), USBR, 2012]]</ref>
+"The design of an earth or rock-fill dam is a process continued until construction is completed. Much additional information on the characteristics of foundations and abutments is obtained during clearing, stripping, and trenching operations, which may confirm or contradict design assumptions based on earlier geologic studies and subsurface exploration by [[drill]] holes and test pits. Operations in the borrow areas and in required excavations also provide much data pertinent to characteristics of fill material and of excavated slopes. Weather and [[groundwater]] conditions during construction may significantly alter water contents of proposed fill material, or create seepage and/or hydraulic conditions, necessitating modifications in design. Projects must be continuously evaluated and “re-engineered,” as required, during construction, to ensure that the final design is compatible with conditions encountered during construction. Design and design review personnel will make construction site visits to determine whether design modifications are required to meet actual field conditions (see ER 1110-2-112). [[Environmental]] considerations discussed in paragraph 2-5 must be given attention in construction operations. "<ref name="EM2300">[[General Design and Construction Considerations for Earth and Rock-Fill Dams (EM 1110-2-2300) | General Design and Construction Considerations for Earth and Rock-Fill Dams (EM 1110-2-2300), USACE]]</ref>
 ==Roles and Responsibilities==