本文選題：土巖組合基坑 + 破壞模式　； 參考：《巖土工程學報》2014年S1期

【摘要】：土巖組合基坑的安全風險預警標準目前主要沿用現有相關規(guī)范中的監(jiān)控標準,這種做法缺乏針對性。為了更有效地指導土巖組合基坑施工,對土巖組合基坑的破壞模式進行了定性分析,并對依托工程典型施工斷面進行了三維有限元分析和現場監(jiān)測,然后,深入對比分析了有限元分析結果和現場監(jiān)測結果。研究指出:1圍護墻的水平位移可作為主要的安全風險預警指標,支撐/土釘/錨桿軸力可作為輔助指標;2圍護墻水平位移最大值、水平位移最大值變化速率、水平位移最大值與基坑開挖深度的比值、支撐/土釘/錨桿軸力值與開挖深度范圍內土壓力的比值等四個特征參數可作為土巖組合基坑安全風險預警指標特征參數;3建立了相應的安全風險預警標準體系,同時認為該依托工程土巖基坑的設計過于保守,從而導致過高的施工成本,因此有必要進行優(yōu)化設計。
[Abstract]:At present, the safety risk early warning standard of soil and rock composite foundation pit mainly adopts the monitoring standard of the existing relevant codes, which is lack of pertinence.In order to guide the construction of soil-rock composite foundation pit more effectively, the failure mode of soil-rock composite foundation pit is qualitatively analyzed, and the 3D finite element analysis and field monitoring of typical construction section of supporting engineering are carried out, then,The results of finite element analysis and field monitoring are compared and analyzed.It is pointed out that the horizontal displacement of the 1 / 1 retaining wall can be used as the main safety risk warning index, and the axial force of the bracing / soil nailing / anchor rod can be used as the auxiliary index for the maximum horizontal displacement and the maximum change rate of the horizontal displacement of the retaining wall.Ratio of maximum horizontal displacement to excavation depth,The four characteristic parameters, such as the ratio of the axial force of bracing / soil nailing / anchor rod to the earth pressure in the depth of excavation, can be used as the characteristic parameters of the earth-rock composite foundation pit safety risk early warning index, and the corresponding safety risk warning standard system is established.At the same time, it is considered that the design of the foundation pit based on soil and rock is too conservative, which leads to too high construction cost, so it is necessary to optimize the design.
【作者單位】： 中交四航工程研究院有限公司;中交交通基礎工程環(huán)保與安全重點實驗室;華南理工大學土木與交通學院;
【分類號】：TU753

【共引文獻】

相關期刊論文 前10條

1 肖建莊;劉瓊;李文貴;Vivian Tam;;再生混凝土細微觀結構和破壞機理研究[J];青島理工大學學報;2009年04期

2 杜怡韓;聶德新;趙其華;;壩基開挖爆破松弛帶劃分及影響因素研究[J];人民長江;2012年11期

3 賀立軍;唐雪云;;HEC固化劑加固膨脹土試驗研究[J];人民黃河;2010年09期

4 余軍;胡q，

本文編號：1762734