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锚杆工法控制对桩锚支护结构稳定性的影响 被引量:2
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作者 张怀文 董可 董辉 《工程勘察》 CSCD 北大核心 2011年第11期24-28,共5页
通过廊坊某广场基坑支护施工过程,分析了锚杆钻孔施工两种工法对桩锚支护结构的稳定性影响。现场锚杆施工使用了两种钻机,分别采用"套管护壁钻进成孔"及"压浆护壁钻进成孔"工法。通过分步开挖变形监测,采用第一种... 通过廊坊某广场基坑支护施工过程,分析了锚杆钻孔施工两种工法对桩锚支护结构的稳定性影响。现场锚杆施工使用了两种钻机,分别采用"套管护壁钻进成孔"及"压浆护壁钻进成孔"工法。通过分步开挖变形监测,采用第一种锚杆成孔工法的护坡桩—锚杆结构变形数据比较平稳,边坡稳定;采用第二种锚杆成孔工法的护坡桩—锚杆结构变形剧烈,边坡稳定性差。表现在几个方面:护坡桩后侧土体流失,桩顶外侧出现塌陷沟槽(宽度×深度=1.0m×1.5m);锚杆拉拔效应后移,锚杆长度范围内地表出现多条裂缝;锚杆应力松弛,实测锚头拉力降低30%~50%;坡顶位移巨大,影响边坡安全。针对边坡出现的不稳定险情,采取了综合处理措施:桩顶后侧设置卸载沟;坡脚回填土方,设置反压土方;锚杆二次补张拉;增补一排锚杆。最终边坡恢复了稳定。 展开更多
关键词 压浆护壁钻进成孔 套管护壁钻进成孔 桩锚结构 基坑稳定性
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A Simplified Analysis Method for the Lateral Deformation of Braced Excavations
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作者 许海勇 刘玮 陈龙珠 《Journal of Shanghai Jiaotong university(Science)》 EI 2013年第2期224-228,共5页
Pile-anchor retaining structure is widely used in foundation pit engineering and side slope engineering in many countries. In contrast to strut, pile-anchor retaining structure has its typical features and advantages.... Pile-anchor retaining structure is widely used in foundation pit engineering and side slope engineering in many countries. In contrast to strut, pile-anchor retaining structure has its typical features and advantages. It does not occupy the internal space of the foundation pit, and the project cost is much lower. Accurate prediction of the lateral displacement of the retaining structure is very important in the design stage. A simplified analysis method and several calculation assumptions of the lateral deformation of pile-anchor retaining structures are set up according to the engineering features. The expression function of lateral displacement versus depth is solved by means of a fitted function and the quasi-elastic summation method. The parameters are obtained through the stiffness equation of the anchors and the principle of minimum potential energy. The analytical evaluation of the lateral deformation curve is then completed, whose applicability is proved through practical engineering. 展开更多
关键词 EXCAVATION pile-anchor retaining structure fitted function lateral deformation analytical evaluation
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