| Autor: |
Hsii-Sheng Hsieh, Tin-Mei Lin, Ting-Ling Tseng |
| Předmět: |
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| Zdroj: |
Journal of GeoEngineering; Dec2023, Vol. 18 Issue 4, p175-181, 7p |
| Abstrakt: |
Liquefaction under seismic loading is an important design issue that has to be carefully dealt with when foundation is sitting on loose or medium dense sand. Loss of bearing capacity or excessive settlement as a result of liquefaction can be detrimental to the integrity of structure even for high rise buildings with relatively rigid raft foundation. Though local seismic design code allows the use of reduction factors on bearing capacity and modulus of subgrade reaction to incorporate the effect of liquefaction in foundation design, it is sometime required to implement certain improvement schemes to eliminate the liquefaction potential if the subgrade is in a very loose or loose state. In urban area where noise and vibration are of main construction concerns, jet grouting and deep mixing that create circular improvement piles are perhaps the only viable schemes for liquefaction mitigation. The liquefiable subgrade is often partially improved as a result of budget constraint, and the improvement ratio generally falls in the range of 10% to 20%. MASW technique is used to measure the shear wave velocity of the improved ground, and it is required that the shear wave velocity of the improved ground exceed a threshold value of 215 m/sec to eliminate the liquefaction potential. Design example is presented in this paper to delineate the logic in implementing the partial improvement scheme for liquefaction mitigation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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