基坑臨時(shí)加深雙層圍護(hù)結(jié)構(gòu)破壞研究*
劉婺1，劉書波2
- 摘 要
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（1遼寧工程技術(shù)大學(xué)建筑工程學(xué)院，阜新 123000； 2沈陽建都工程建設(shè)監(jiān)理公司，沈陽112700）[摘 要] 基坑需要臨時(shí)加深時(shí)，在原圍護(hù)結(jié)構(gòu)內(nèi)側(cè)再增設(shè)一道圍護(hù)結(jié)構(gòu)已成為確保開挖安全的重要措施。內(nèi)側(cè)圍護(hù)結(jié)構(gòu)的位置以及尺寸的選擇對(duì)整個(gè)基坑的變形及穩(wěn)定性有重要影響。通過有限元法研究了不同內(nèi)側(cè)圍護(hù)結(jié)構(gòu)參數(shù)選擇對(duì)基坑破壞形態(tài)的影響，其中包括內(nèi)外墻重疊深度、內(nèi)墻嵌入比、內(nèi)外墻距離等。分析結(jié)果表明，該雙層圍護(hù)結(jié)構(gòu)的破壞形態(tài)可能有外墻的踢腳破壞，強(qiáng)度破壞，內(nèi)墻的踢腳、傾覆破壞，整體失穩(wěn)等，不同的內(nèi)墻設(shè)計(jì)可能導(dǎo)致不同的潛在破壞形態(tài)，在分析的基礎(chǔ)上，提出了防止不同圍護(hù)結(jié)構(gòu)破壞形態(tài)的設(shè)計(jì)注意事項(xiàng)，為類似的基坑工程設(shè)計(jì)提供了依據(jù)。[關(guān)鍵詞] 破壞形態(tài); 基坑; 雙層圍護(hù)結(jié)構(gòu); 有限元法中圖分類號(hào)：TU471.99 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)S2-0605-04Study on failure mode of double-row support structure for deepened braced excavationLiu Wu 1 , Liu Shubo2(1 College of Civil Engineering and Architecture, Liao Ning Technical University, Fuxin 123000，China; 2 Shenyang Jiandu Supervision Company of Construction Engineering , Shenyang 110181, China)Abstract: Adding another supporting wall inside the original support wall is an important measure to ensure the safety of the excavation when the excavation depth increases temporarily. The location and dimension of the inner wall has a significant influence on the deformation and stability of the excavation. Parametric studies were carried out to investigate the influence factors on the failure model of the support structures with finite element analysis. The parameters include overlapping length of the two support walls, embedment ratio of the inner wall and distance between the two support walls. The results show that the potential failure mode including ‘kick foot’ failure and strength failure of the outer wall, ‘kick foot’ failure and overturn failure of the inner wall, integral instability and so on. Suggestions preventing failure were presented and provide a basis for the design of similar foundation pits.Keywords: failure mode; foundation pit; double-row support structure; finite element method作者簡(jiǎn)介：劉婺，學(xué)士，Email：lntuliushuxian@163.com。
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