广东建材
廣東建材
엄동건재
GUANGDONG CONSTRUCTION
2015年
6期
36-39
,共4页
软土基坑%力学特性%拆撑影响%数值分析%时间效应
軟土基坑%力學特性%拆撐影響%數值分析%時間效應
연토기갱%역학특성%탁탱영향%수치분석%시간효응
soft soil foundation pit%mechanical characteristics%the influence of dismantling temporary shoring%numerical analysis%time effect
对软土深基坑开挖支护和拆撑过程进行了三维数值模拟，计算分析了基坑开挖支护与拆撑施工全过程土层、结构力学特性。结果表明：软土基坑围护结构与土层间错动较为显著，因软土层极限剪应变很小，局部出现滑移破坏；基坑拆撑过程对围护结构的受力变形产生了显著的影响，基坑设计施工应给予充分考虑；软土基坑开挖表现出了较强的时间效应，应减小软土基坑的暴露时间，及时施作垫层及底板，以有效控制位移和内力。
對軟土深基坑開挖支護和拆撐過程進行瞭三維數值模擬，計算分析瞭基坑開挖支護與拆撐施工全過程土層、結構力學特性。結果錶明：軟土基坑圍護結構與土層間錯動較為顯著，因軟土層極限剪應變很小，跼部齣現滑移破壞；基坑拆撐過程對圍護結構的受力變形產生瞭顯著的影響，基坑設計施工應給予充分攷慮；軟土基坑開挖錶現齣瞭較彊的時間效應，應減小軟土基坑的暴露時間，及時施作墊層及底闆，以有效控製位移和內力。
대연토심기갱개알지호화탁탱과정진행료삼유수치모의，계산분석료기갱개알지호여탁탱시공전과정토층、결구역학특성。결과표명：연토기갱위호결구여토층간착동교위현저，인연토층겁한전응변흔소，국부출현활이파배；기갱탁탱과정대위호결구적수력변형산생료현저적영향，기갱설계시공응급여충분고필；연토기갱개알표현출료교강적시간효응，응감소연토기갱적폭로시간，급시시작점층급저판，이유효공제위이화내력。
Three-dimensional numerical simulation for soft soil foundation during excavating and dismantling shoring was conducted to reveal the mechanical features of soil and retaining structures. The results show that the interface slippage between soil and retaining structures is significant and the local sliding failure appears be-cause extreme shear strain of is very small. The influence of dismantling temporary shoring on mechanical and deformation is significant, so it should be fully considered during design and construction of foundation. Time effect obviously exists in the soft soil foundation excavation, so it can decrease the exposure time of excavation and quickly construct the concrete cushion and bottom slab to control the deformation and internal forces of the retaining structures.
