Kieåm tra chaát löôïng coïc
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2- söùc chòu taûi cho pheùp cuûa coïc ñôn
Söùc chòu taûi cho pheùp cuûa coïc ñôn thaúng ñöùng thöôøng ñöôïc xaùc ñònh baèng söùc chòu taûi giôùi haïn hoaëc taûi troïng phaù hoïai chia cho heä soá an toøan. Thoâng thöôøng heä soá an toøan Fs = 2, tuy nhieân vieäc aùp duïng heä soá an toøan cao hôn hoaëc thaáp hôn tuøy thuoäc vaøo möùc ñoä quan troïng cuûa coâng trình, ñieàu kieän ñaát neàn, ñaëc ñieåm coïc vaø phöông phaùp thí nghieäm.
Check the quality of piling
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2 –the permission working load of single-pile
the permission working load of single-vertical piling usually are identified by permission maximum load subject to important limitations or limit of downloaded detection system divided by the number of safety factor. Common system safety factor is Fs = 2, but job safety factor system applies safety higher or lower depending on the level of importance of items/building, soil background conditions, features piling and experimental/testing methods.
Lyù thuyeát moùng coïc beâtoâng coát theùp
Baûng 2.13 baûng tra heä soá ns
Loïai ñaát söùc choáng xuyeân thuûng qc (kG/cm2)
25 100 200
Cuoäi soûi - - -
Caùt thoâ - - -
Caùt mòn - - -
Heä soá an toøan trong tröôøng hôïp naøy ñöôïc xaùc ñònh nhö sau
FS = 2.0 -> 3.0 FSs = 2.0 -> 3.0 FSb = 1.5 ->2.0
Theoretical of RC piling-foundation
table 2.13 for ns factor
against trans-ground/ through ground qc (kg/cm2)
25 100 200
gravel - - --
Sand - - --
Abrasive sand - - --
safety factor in this case is determined as follows
FS = 2.0 -> 3.0
PICTURES-SOURCE
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