既有高邊坡下深基坑支護(hù)設(shè)計(jì)與施工監(jiān)測(cè)分析
戴文奎1，熊智彪1，宮鶴1，王仁杰1，宋世豪2
- 摘 要
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（1南華大學(xué)城建學(xué)院， 衡陽(yáng) 421001； 2 湖南核工業(yè)巖土工程勘察設(shè)計(jì)研究院， 長(zhǎng)沙 410001）［摘要］某既有高陡邊坡下深基坑采用了樁錨支護(hù)結(jié)構(gòu)，介紹了支護(hù)結(jié)構(gòu)設(shè)計(jì)。在基坑支護(hù)結(jié)構(gòu)施工和開(kāi)挖過(guò)程中，對(duì)支護(hù)結(jié)構(gòu)位移、錨索拉力以及周邊建筑物沉降進(jìn)行了監(jiān)測(cè)，并結(jié)合施工工況對(duì)監(jiān)測(cè)數(shù)據(jù)進(jìn)行了分析。分析結(jié)果表明：基坑頂支護(hù)結(jié)構(gòu)的水平位移受基坑旁既有高邊坡的影響，其與邊坡的高度、基坑頂上的荷載大小有關(guān)；錨索拉力突然出現(xiàn)先降后升的異?，F(xiàn)象，是錨索失效的征兆；基坑周邊房屋沉降與距基坑的距離有關(guān)，鄰近基坑一側(cè)沉降大，遠(yuǎn)側(cè)沉降小。最后介紹了當(dāng)基坑周邊房屋沉降過(guò)大而成為危房時(shí)所采用的加固措施。［關(guān)鍵詞］既有高邊坡; 深基坑; 支護(hù)結(jié)構(gòu); 監(jiān)測(cè)中圖分類號(hào)：TU473 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)24-0068-04Supporting design and construction monitoring analysis of deep foundation pit under an existing high-steep slopeDai Wenkui1, Xiong Zhibiao1, Gong He1, Wang Renjie1, Song Shihao2(1 College of Urban Construction, University of South China, Hengyang 421001, China; 2 Institute of Nuclear Industry Geotechnical and Engineering Investigation Design and Research, Changsha 410001, China)Abstract: The pile-anchor supporting structure is applied in a deep foundation pit under an existing high-steep slope, and the design of the supporting structure was introduced. The displacement of the supporting structure, the tension of anchor rope, and the settlement of the surrounding buildings were monitored when the supporting structure of the excavation was being constructed and excavated. Combining construction state, the monitoring data was analyzed. The analysis results show that the horizontal displacement of the supporting structure at the top of the foundation pit is affected by the existing high-steep slope, its value is relative to height of the slope and the magnitude of load at the top of the foundation pit. It can be judged a symptom of the failure anchors that anchor cable tension suddenly appears abnormal phenomenon which decreases first and then increases. The settlement of the buildings surrounding the foundation pit is relative to the distance from the foundation pit, the settlement is large nearby the foundation pit and small far away from it. Reinforcement measures were introduced when the buildings surrounding the foundation become dangerous buildings due to too large settlement of the buildings.Keywords: existing high-steep slope; deep foundation pit; supporting structure; monitor作者簡(jiǎn)介：戴文奎, 碩士研究生， Email:554105720@qq.com。參考文獻(xiàn)［1］孫凱，方宗新，蘇魁聰. 高陡邊坡下基坑邊坡的穩(wěn)定與變形控制設(shè)計(jì)［C］//中國(guó)巖石力學(xué)與工程學(xué)會(huì)第七次學(xué)術(shù)大會(huì)論文集.西安，2002：477-481.［2］熊智彪，王啟云. 某復(fù)雜平面基坑支護(hù)結(jié)構(gòu)水平位移監(jiān)測(cè)及加固［J］. 巖土力學(xué), 2009, 30(2)：572-576.［3］趙忠?guī)r，石漢生，劉翔，等.南京聯(lián)強(qiáng)國(guó)際大廈深基坑支護(hù)設(shè)計(jì)與監(jiān)測(cè)［J］. 建筑結(jié)構(gòu), 2007，37(9)：115-117.［4］房師軍，付擁軍，姚愛(ài)軍.某地鐵工程深基坑排樁圍護(hù)結(jié)構(gòu)變形規(guī)律分析［J］. 巖土工程學(xué)報(bào), 2011, 33(1)：216-219.［5］JGJ 125—99 危險(xiǎn)房屋鑒定標(biāo)準(zhǔn)［S］.北京：中國(guó)建筑工業(yè)出版社，2000.
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