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engineering Geology Final.pdf - Adobe crobat Reader DC File EditView Windaw Help Home Tools engineering Geolo....x Sign In University of North Dakota Spring 2018 HHSGGE GeoE 323/Ho 6. (20) Please describe the definition of soil liquefaction under earthquake loads. Moreover what are the necessary conditions for soil liquefaction to occur under cyclic loads? In order to prevent the soil liquefaction during an earthquake, what methods can be used to improve the ground against soil liquefaction? (Give 4 examples). O 2:10 PM 5,7/2018 Type here to searchExplanation / Answer
Liquifaction may be defiend as the loss of strength in saturated cohesionless soil due to increased pore water pressure. when pore water pressure is increased effective stress of soil is reduced due to cyclic loading. Due to liquifaction soil particle move freely and hence reduces soil strength and as a resultof this bearing capacity of soil reduce. Earthquake load is best suitable loading condition for liquifaction because of its cyclic nature. Earthquake load is vibratory in nature which causes liquifaction of soil.
conditions of liquifaction are:-
1. Loose granular sediment:- Loose granular sedient is prone to liquifaction. this provide easy movement of soil paricle under cyclic loading. Loose particle also provide opportunity to develope pore water pressure easily.
2.strong shaking:- the stronger is the shaking the easy is the liquifaction. so the liquifaction is common in earthquake loading.
3. Saturaton of soil:- when soil is fully saturated then liquifaction is very common under cyclic loading.
Prevention from liquifaction
1.compaction through vibration:-It uses vibrating probe which causes solidifacation of loose grained soil and this lead to increase in bearing capacity of the soil.
2. Dynamic compaction:-Droping of heavy concrete of steel loads from 80-100 feet above in a grid pattern to compact the loose soil in order to increse the bearing capacity of soil.
3. Compaction grouting:-Slurry of cement sand and water is injected in the losse sands to make it solid and interlink the cracks.
4. Stone columns:- Steel casin is driven in the ground and then concrete is poured and tamped as the steel casin is withdrawn successively.
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