【摘要】：隨著國家基礎(chǔ)建設(shè)的快速發(fā)展，黃土地區(qū)的工程項目越來越多。黃土的濕陷性問題隨即成為施工工程的研究熱點。看似穩(wěn)固的黃土在浸水后，工程特性急劇變化，強度迅速降低。黃土濕陷引發(fā)的工程事故中，又以基坑支護結(jié)構(gòu)失穩(wěn)為主。因此，基坑的變形監(jiān)測工作越來越重要。 但是現(xiàn)行的《建筑基坑工程監(jiān)測技術(shù)規(guī)范》（GB50497-2009）明確指出不適合濕陷性黃土地區(qū)。而《濕陷性黃土地區(qū)建筑規(guī)范》（GB50025-2004）與《濕陷性黃土地區(qū)建筑基坑工程安全技術(shù)規(guī)程》（JGJ167-2009）對基坑監(jiān)測的項目、頻率及預警值的規(guī)定較為模糊，實際工程中操作難度較大。 本文通過對國內(nèi)外濕陷性黃土和基坑變形監(jiān)測的研究現(xiàn)狀歸納整理后，結(jié)合實際工程，主要的研究內(nèi)容有如下幾個方面： 1、系統(tǒng)分析了黃土的分布、成因、微觀結(jié)構(gòu)、濕陷機理及工程特性等問題； 2、研究了濕陷性黃土地區(qū)常見的基坑支護結(jié)構(gòu)類型特點、適用范圍以及不同支護結(jié)構(gòu)機理的監(jiān)測內(nèi)容； 3、對現(xiàn)行常規(guī)基坑監(jiān)測項目的施測方法進行歸納分析，并結(jié)合規(guī)范對濕陷性黃土地區(qū)基坑監(jiān)測的預警值和監(jiān)測頻率確定方法進行研究； 4、結(jié)合西安地區(qū)一典型濕陷性黃土地層深基坑監(jiān)測數(shù)據(jù)，分析不同支護結(jié)構(gòu)在施工期間的變形情況，，并驗證本研究提出的制定監(jiān)測頻率和預警值方法的合理性。 綜上所述，本文較系統(tǒng)的研究了濕陷性黃土地區(qū)基坑監(jiān)測工作的重點內(nèi)容，針對濕陷性黃土地區(qū)提出了基坑監(jiān)測預警值及監(jiān)測頻率的確定方法，對優(yōu)化濕陷性黃土地區(qū)基坑監(jiān)測工作效率及經(jīng)濟效益具有理論和現(xiàn)實意義。
[Abstract]:With the rapid development of national infrastructure, there are more and more engineering projects in loess area. The collapsibility of loess becomes the research hotspot of construction engineering. After soaking in water, the seemingly stable loess has a sharp change in engineering properties and a rapid decrease in strength. In the engineering accidents caused by loess collapsibility, the instability of foundation pit support structure is the main factor. Therefore, the deformation monitoring of foundation pit is becoming more and more important. However, the current Technical Code for Monitoring of Foundation Pit Engineering (GB50497-2009) clearly points out that it is not suitable for collapsible loess areas. However, the regulation of frequency and early warning value of foundation pit monitoring items in collapsible loess area (GB50025-2004) and collapsible loess area (JGJ167-2009) is rather fuzzy, and the operation is difficult in practical engineering. After summing up the research status of collapsible loess and foundation pit deformation monitoring at home and abroad and combining with practical engineering, the main research contents are as follows: 1. The distribution and cause of loess are systematically analyzed. The microstructure, collapsing mechanism and engineering characteristics are discussed. 2. The common characteristics of foundation pit supporting structure in collapsible loess area, the applicable scope and the monitoring content of different supporting structure mechanism are studied. 3. Generalize and analyze the current routine foundation pit monitoring project, and study the early warning value and monitoring frequency determination method of foundation pit monitoring in collapsible loess area. 4. Based on the monitoring data of deep foundation pit of a typical collapsible loess stratum in Xi'an area, the deformation of different supporting structures during construction is analyzed, and the rationality of the method of establishing monitoring frequency and early warning value proposed in this study is verified. To sum up, this paper systematically studies the key contents of foundation pit monitoring in collapsible loess area, and puts forward a method to determine the monitoring and warning value and monitoring frequency of foundation pit in collapsible loess area. It is of theoretical and practical significance to optimize the efficiency and economic benefit of foundation pit monitoring in collapsible loess area.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU753

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