EARTHQUAKE PROVISIONS IN BUILDING CODES - Geotechnical Earthquake Engineering - page 479

also increase in severity. However, it was reasoned that under the MCE, the consequence of
liquefaction should be evaluated under this PGA to assure that building collapse was avoided.
It is important to recognize that this more stringent method of using the MCE G peak
ground acceleration for studies of liquefaction, slope movement, and so forth, is only appli-
cable for structures assigned to Seismic Design Category D, E, or F.
14.2.9 Report Preparation
Concerning report preparation, the International Building Code (2012) states:
Section 1803.6 Reporting. Where geotechnical investigations are required, a written report
of the investigations shall be submitted to the building official by the owner or authorized agent
at the time of permit application. The geotechnical report shall include, but need not be limited
to, the following information:
1. A plot showing the location of the soil investigations.
2. A complete record of the soil boring and penetration test logs and soil samples.
3. A record of the soil profile.
4. Elevation of the water table, if encountered.
5. Recommendations for foundation type and design criteria, including but not limited to:
bearing capacity of natural or compacted soil; provisions to mitigate the effects of expan-
sive soils; mitigation of the effects of liquefaction, differential settlement and varying soil
strength; and the effects of adjacent loads.
6. Expected total and differential settlement.
7. Deep foundation information in accordance with Section 1803.5.5.
8. Special design and construction provisions for foundations of structures founded on
expansive soils, as necessary.
9. Compacted fill material properties and testing in accordance with Section 1803.5.8.
10. Controlled low-strength material properties and testing in accordance with Section 1803.5.9.
Item 10 refers to a controlled low-strength material (CLSM), which is also known as
soil-cement slurry, soil-cement grout, flowable fill, controlled density fill, unshrinkable
fill, K-Krete, and other similar names (see ASTM D 4832). CLSM is typically used as
backfill material around structures.
The local building department or governing agency may require that additional items
be included in the foundation engineering report. The geotechnical engineer should always
inquire about local building department or governing agency requirements concerning
report preparation. An example of a geotechnical report dealing with earthquake engineer-
ing is presented in App. D of this topic.
14.3 PROBLEMS
The problems have been divided into basic categories as indicated below:
Retaining Walls
14.1 For the retaining wall shown in Fig. 10.5 (i.e., the 20-ft-high gravity retaining
wall), determine the values of P H and P V using the active earth pressure listed in Table 14.10.