緊鄰立交橋的連續(xù)墻受力分析和安全性評(píng)價(jià)

陳江 陽軍生 陳思明 張學(xué)民 歐雪峰

摘要：以深圳地鐵車公廟交通樞紐7 & 9號(hào)線車站深基坑工程為研究背景，選取典型的監(jiān)測(cè)斷面，埋置混凝土應(yīng)變計(jì)，進(jìn)行地下連續(xù)墻的內(nèi)力測(cè)試，分析了連續(xù)墻在深基坑開挖過程中的內(nèi)力變化規(guī)律，并對(duì)連續(xù)墻的安全性進(jìn)行了評(píng)價(jià)，得到以下結(jié)論：隨著基坑開挖深度的增加，地下連續(xù)墻的內(nèi)力變化越發(fā)明顯，基坑負(fù)二層和負(fù)三層開挖對(duì)連續(xù)墻的內(nèi)力變化影響較大，應(yīng)重點(diǎn)關(guān)注和監(jiān)測(cè)；根據(jù)現(xiàn)場(chǎng)測(cè)試數(shù)據(jù)得到兩側(cè)地下連續(xù)墻的內(nèi)力變化并非完全一致，主要受到緊鄰基坑開挖和周邊建筑物的影響；最后計(jì)算得到地下連續(xù)墻處于安全狀態(tài)。

關(guān)鍵詞：地下連續(xù)墻；現(xiàn)場(chǎng)測(cè)試；彎矩；安全系數(shù)

中圖分類號(hào)：TU28

文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1674-4764（2016）03-0012-06

Abstract：A typical measurement-section was selected， and concrete strain meters were embedded to make measurement for diaphragm walls on the construction of Station of Metro Line 7&9 of Chegongmiao Station of Shenzhen Metro. The internal force change of diaphragm walls was discussed， and the reliability of diaphragm walls was evaluated. Results showed that with the increasing of the excavation depth of foundation pits， the variation of stresses of diaphragm walls was observable. According to the strain data from field measurement， safety factors of diaphragm walls were calculated， which turned out to meet national code. Meanwhile， it can be concluded that diaphragm walls were in the safe status. In the end， the variation relationship of their internal force， which would provide some references for the design and construction of similar projects in the future， was obtained.

Keywords：diaphragm wall； field measurement； bending moments； safety factor

隨著中國城市地鐵的大規(guī)模建設(shè)，施工中常遇到一些問題，尤其是地鐵車站深基坑施工的安全性，受到了工程建設(shè)者和專家的廣泛關(guān)注。為了確保深基坑施工過程的安全，對(duì)地下連續(xù)墻在施工過程中的受力變化規(guī)律進(jìn)行研究十分必要。由于缺少對(duì)地下連續(xù)墻內(nèi)力的現(xiàn)場(chǎng)測(cè)試，對(duì)地下連續(xù)墻在施工過程中的受力變化規(guī)律進(jìn)行研究就比較困難，因此，對(duì)連續(xù)墻進(jìn)行內(nèi)力測(cè)試是直接和有效的手段。

對(duì)地下連續(xù)墻的研究，許多學(xué)者通過室內(nèi)試驗(yàn)和現(xiàn)場(chǎng)水平位移監(jiān)測(cè)來進(jìn)行。Emilios等[1]研究了地下連續(xù)墻的成槽和澆筑過程中對(duì)周邊建筑物的影響，但對(duì)連續(xù)墻的內(nèi)力沒有研究；Anthony等[2]、Wyjadlowski等[3]對(duì)地下連續(xù)墻在基坑開挖過程中的穩(wěn)定性進(jìn)行了研究；……