相鄰淺基礎交互作用對極限承載力的影響

Interaction Effects on the Ultimate Bearing Capacity of Adjacent Shallow Foundations

陳建宏(Jian-Hong Chen)

指導教授 ： 馬正明

義守大學/理工學院/土木與生態工程學系/碩士(2016年)

摘要

台灣近年來都市快速發展，各項建設在進行基礎工程時，鄰近地區已經存在許多建築物，常有因為開挖的因素進而影響週遭建築物導致鄰房損壞之情形。為了有效避免基礎工程對鄰近兩個淺基礎造成的影響，所以本論文探討相鄰淺基礎之交互作用影響所造成承載力的變化。
本研究利用大地工程電腦軟體PLAXIS 8 .5 進行平地單一淺基礎極限承載力與兩座鄰近淺基礎交互作用極限承載力之數值模擬，固定基礎寬度為兩公尺、設定固定邊界長80公尺高度20公尺以及細網格，改變淺基礎相鄰距離xB、以及兩種不同土壤，φ角分別為28°、30°、33°、35°、37°、40°的砂土土壤以及和c值分別20kN/㎡、30kN/㎡、50 kN/㎡、80kN/㎡、120 kN/㎡、150 kN/㎡的黏土土壤之狀況下去探討其承載力之變化。
由PLAXIS分析模擬是結果中，砂土土壤相鄰淺基礎間距越相近，相鄰淺基礎極限承載力逐漸下降，當相鄰淺基礎間趨近於6B(12m)時，淺基礎其承載力數值漸漸趨近於單一淺基礎平地極限承載力。則黏土土壤相鄰淺基礎間距越相近，相鄰淺基礎承載力逐漸下降，但是黏土相鄰淺基礎間趨近於5B(10m)時，淺基礎極限承載力數值就趨近於單一淺基礎平地極限承載力。

關鍵字

淺基礎 ； 承載力 ； 內摩擦角φ ； 凝聚力c值

並列摘要

As cities have developed rapidly in Taiwan, it is a common phenomenon that foundation excavation of newly-built infrastructure causes damages to the surrounding buildings. In order to avoid influencing two adjacent shallow foundations resulted from foundation engineering, the essay illustrates the load power changes caused by shallow foundation interaction effect.

The research based on numerical simulation of Interaction Effects on the Ultimate Bearing Capacity of Adjacent Shallow Foundations.With originally fixed width of two meters, setting a length of 80 meters and a height of 20 meters and using fine grid.Changing the distance between two shallow foundations to xB. with two kind of different soils, the distinction frictionangle Φ angle respectively be 28°, 30°, 33°, 35°, 37°, 40° the sandy soil soil as well as with the Cohesion distinction 20kN/㎡, 30kN/㎡, 50 kN/㎡, 80kN/㎡, 120 kN/㎡, condition of the 150 kN/㎡ clay soil discusses its load bearing change.

By the PLAXIS analysis simulation is in the result, the sandy soil soil neighboring shallow foundation spacing is closer, the neighboring shallow foundation supporting capacity drops gradually, when between the neighboring shallow foundation draws close in 6B(12m), the shallow foundation its load bearing value draws close gradually in the sole shallow foundation flat land supporting capacity.Then the clay soil neighboring shallow foundation spacing is closer, the neighboring shallow foundation supporting capacity drops gradually, when between the clay neighboring shallow foundation draws close in 5B(10m), shallow foundation load bearing value on approach in sole sahllow foundation flat land supporting capacity.

並列關鍵字

PLAXIS ； shallow foundations ； ultimate bearing ； frictionangle ； cohesion

參考文獻

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