沈阳某基坑变形规律的研究

发布时间：2018-08-09 18:07

【摘要】：伴随着经济的发展,城市的规划用地越来越紧张,开发城市的地下空间已经成为一种必然的趋势。在城市化的推进下,建筑物的密度日趋增大,基坑工程的安全性和稳定性问题日益突出。近些年常会出现基坑工程位于已运行的地铁区间隧道之上或之侧这一新问题。基坑变形直接关系到支护结构的安全稳定、基坑周边环境安全及基坑工程顺利施工,它主要包括支护结构的水平位移、基坑周边地表沉降、基坑底部隆起等。基坑变形形式、计算方法、变形限值等方面的深入研究成为基坑工程支护结构设计的重点和难点。本文结合沈阳某基坑工程的实测数据,对基坑变形进行了分析,并结合数值模拟研究了基坑变形影响因素。1、通过对沈阳某基坑变形机理和围护结构影响情因素的分析,得出影响基坑变形的主要因素有：基坑围护结构的设计情况、基坑所在地的地质、基坑形状、开挖深度、基坑周边环境、施工方案等。2、在基坑工程施工的过程中,应选择合理的施工方案,并且对围护结构桩体的变形、桩顶水平位移、周围地面沉降等进行全方位监测,根据监测数据判断可能出现的问题,预防事故的发生。3、在基坑开挖的过程中,随着基坑开挖深度逐渐增大,围护结构的水平变形也不断增大,并且向基坑内变形,最大位移发生在围护结构的顶端。4、在运用ABAQUS软件进行数值模拟时,由于参数选取过于保守,从而使数据出现较大差异。从中可以看出,在运用ABAQUS软件进行数值模拟时,应对相应的参数进行校正,更贴近于实际施工,从而使模拟数据出更趋近于实际情况。
[Abstract]:With the development of economy, urban planning land is becoming more and more tight, and it has become an inevitable trend to develop urban underground space. With the development of urbanization, the density of buildings increases day by day, and the safety and stability of foundation pit engineering become more and more serious. In recent years, there is a new problem of foundation pit engineering located above or on the side of the subway tunnel in operation. The deformation of foundation pit is directly related to the safety and stability of the supporting structure, the safety of the surrounding environment of the foundation pit and the smooth construction of the foundation pit. It mainly includes the horizontal displacement of the supporting structure, the ground subsidence around the foundation pit, the uplift of the bottom of the foundation pit, and so on. The deep research of foundation pit deformation form, calculation method and deformation limit value has become the key and difficulty of foundation pit engineering supporting structure design. Based on the measured data of a foundation pit project in Shenyang, the deformation of foundation pit is analyzed, and the influencing factors of foundation pit deformation are studied by numerical simulation. The deformation mechanism of a foundation pit and the influencing factors of enclosure structure in Shenyang are analyzed. The main factors influencing the deformation of foundation pit are as follows: the design of foundation pit enclosure structure, the geology of foundation pit location, the shape of foundation pit, the depth of excavation, the surrounding environment of foundation pit, the construction scheme and so on. The reasonable construction plan should be selected, and the deformation of the pile body, the horizontal displacement of the top of the pile and the settlement of the surrounding land should be monitored in all directions, and the possible problems should be judged according to the monitoring data. In the course of foundation pit excavation, as the excavation depth increases, the horizontal deformation of the retaining structure also increases, and it deforms into the foundation pit. The maximum displacement occurs at the top of the enclosure structure. When the numerical simulation is carried out with ABAQUS software, the parameter selection is too conservative, so there is a great difference in the data. It can be seen that when using ABAQUS software to carry out numerical simulation, the corresponding parameters should be corrected more closely to the actual construction, thus making the simulation data closer to the actual situation.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU433

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