桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
1期
62-67
,共6页
金书成%仇正中%张永涛%黎冰
金書成%仇正中%張永濤%黎冰
금서성%구정중%장영도%려빙
基础工程%沉箱%静载试验%承载能力%模型试验
基礎工程%沉箱%靜載試驗%承載能力%模型試驗
기출공정%침상%정재시험%승재능력%모형시험
foundation engineering%caisson%static load test%bearing capacity%model test
为研究吸力式沉箱组合基础的承载特性，制作高15 cm和30 cm的单沉箱基础与四沉箱组合基础模型，对沉箱基础进行细砂条件下的静载试验，研究单沉箱基础与四沉箱组合基础在竖向荷载、水平荷载及组合荷载作用下的承载能力及破坏模式等。结果表明：在竖向荷载作用下，四沉箱基础发生缓变型破坏，随着沉箱高度的增加，侧摩阻力占总承载能力的比例增加；在水平荷载作用下，四沉箱组合基础发生转动破坏，基础的水平极限承载力随沉箱基础高度的增加而增大；在组合荷载作用下，一定的顶部预压可有效地提高沉箱基础的承载能力，与单沉箱基础相比，四沉箱组合基础可以有效地提升基础的水平和竖向承载能力，其基础的破坏位移更大，使基础的承载性能得到了更好的发挥。
為研究吸力式沉箱組閤基礎的承載特性，製作高15 cm和30 cm的單沉箱基礎與四沉箱組閤基礎模型，對沉箱基礎進行細砂條件下的靜載試驗，研究單沉箱基礎與四沉箱組閤基礎在豎嚮荷載、水平荷載及組閤荷載作用下的承載能力及破壞模式等。結果錶明：在豎嚮荷載作用下，四沉箱基礎髮生緩變型破壞，隨著沉箱高度的增加，側摩阻力佔總承載能力的比例增加；在水平荷載作用下，四沉箱組閤基礎髮生轉動破壞，基礎的水平極限承載力隨沉箱基礎高度的增加而增大；在組閤荷載作用下，一定的頂部預壓可有效地提高沉箱基礎的承載能力，與單沉箱基礎相比，四沉箱組閤基礎可以有效地提升基礎的水平和豎嚮承載能力，其基礎的破壞位移更大，使基礎的承載性能得到瞭更好的髮揮。
위연구흡력식침상조합기출적승재특성，제작고15 cm화30 cm적단침상기출여사침상조합기출모형，대침상기출진행세사조건하적정재시험，연구단침상기출여사침상조합기출재수향하재、수평하재급조합하재작용하적승재능력급파배모식등。결과표명：재수향하재작용하，사침상기출발생완변형파배，수착침상고도적증가，측마조력점총승재능력적비례증가；재수평하재작용하，사침상조합기출발생전동파배，기출적수평겁한승재력수침상기출고도적증가이증대；재조합하재작용하，일정적정부예압가유효지제고침상기출적승재능력，여단침상기출상비，사침상조합기출가이유효지제승기출적수평화수향승재능력，기기출적파배위이경대，사기출적승재성능득도료경호적발휘。
To study the bearing characteristics of the suction caisson combined foundation for bridge ,the models of the 15 cm high and 30 cm high single‐caisson foundation and four‐caisson combined foundation were prepared ,the static load tests for the two types of the foundations un‐der the fine sand condition w ere made and the bearing capacity and failure modes of the founda‐tions respectively under the vertical load ,horizontal load and combination load were studied .The results of the study indicate that under the vertical load ,the slow failure occurs in the four‐cais‐son combined foundation and with the increase of the caisson height ,the ratio of the lateral fric‐tional resistance of the foundation accounting for the total bearing capacity increases .Under the horizontal load ,the rotary failure occurs in the combined foundation and with the increase of the caisson height ,the horizontal ultimate bearing capacity of the foundation increases .Under the combination load ,a certain precompression on the top of the combined foundation can effectively improve the bearing capacity of the foundation .In comparison with the single‐caisson foundation , the four‐caisson combined foundation can effectively improve the horizontal and vertical bearing capacity of the foundation .The failure displacement of the combined foundation is greater and the bearing characteristics of the foundation can be brought into better play .
