工程丁丁召換 Ground water table 一問

有沒巴絲知Ground Water Table High同Low, 平時做design應該用邊樣

請高手出招

睇你Design乜野

可唔可以講啲example

咁你諗下你design既野 高水位同低水位對個結構有咩影響？ 會唔會design低水位 萬一高水位就即刻fail?

好似乜乜係1/3 水位
巴打可唔可以講解下
感謝大大

1/3水位 多數都係retaining wall/slope design
個水位其實係有assumption 自己努力D搵書睇下個theory
香港有部分結構用1/3水位其實主要係因為geoguide 1 有recommend過個design water level的consideration.
如果最高水位去到地面落1-2m 都好大機會用full water level
btw geoguide 1 唔好淨係睇最新版.

thx 大大

問多小小
如果計Settlement
係咪assume 用1/3 低水位就ok

正常1/3水位好唔scientific
要黎prelim design 就OK
正常應該要standpipe/ piezometer度水

其實 groundwater果 limit點定
BD Foundation Code話below果limit就要Suspensions

成日用ground level就算留名學野

高手召換

我都係🤣 full水唔洗比人煩

曬錢撚

睇你要計邊種settlement
Excavation 就用design groundwater
Water seepage就lowest level
Full water如果係爛泥地質 應該死到七彩

Lowest Level姐係水位=0？

Full 水得嚟唔洗做plate load test咪算數😂

死火撈埋嚟講添

Plate Load Test 係for bearing capacity wo
其實我想知settlement water table low limit點定

就咁睇你話1/3 我估你design緊既其實係permanent retaining structure. 呢類好少會話特別計settlement. 當然要睇個成個地質係咪相若

主要涉及settlement 都係關ELS事 會引致ground settlement 既有
1. excavation works
2. groundwater drawdown due to excavation
3. Installation of temporary support/pile foundation
第一二點先係最關water level 事
Excavation works每一下會令挖泥範圍少左原有的soil pressure & 兩邊既active movement而引起的ground movement, and thus settlement. 呢個works會用design water level 黎做design 即係highest possible water level.
第二點
Water drawdown係由於你挖泥之後 令兩邊有water level difference. Water Seepage 會令 groundwater 由高位流去低位. 少左水既泥 個soil stress係會多過原先有水的時候（原因自己諗）變相有additional stress壓落個泥到 好似做左‘pre loading’咁 因為呢個過程係過往幾十萬年ground water level改變都會有既 曾經經歷過個stress既soil唔會再deform 所以會take lowest level before excavation

巴打我可唔可以含你