深基坑周边建筑物沉降预测及安全性评估

发布时间：2018-05-16 11:47

本文选题：软土地区 + 深基坑开挖　；参考：《重庆大学》2014年硕士论文

【摘要】：城市经济繁华区域的在建工程基坑，都会受周边道路、建筑、市政管网等的限制。基坑开挖过程中不仅要考虑基坑自身的安全，还要考虑基坑开挖对周边环境的影响，特别是一些具有重要意义的建筑物。深基坑周边的建筑物的安全性问题越来越成为一个普遍而具有重大意义的研究课题。本文依托上海古北财富中心基坑工程，以基坑周边申康宾馆1#楼为例，通过神经网络技术对建筑物沉降值进行预测，并根据建筑物的影响因子进行安全性评估。主要进行的工作如下： ○1针对上海软土地区的特点，研究深基坑开挖过程中土体之间的相互作用与应力分布，对开挖过程中基坑的周边地层沉降进行模拟，分析基坑周边地层沉降规律。 ○2利用神经网络技术，提出根据基坑的开挖深度、建筑物与基坑边缘距离、土层的粘聚力、内摩擦角、土体的重度等五个方面对周边建筑的沉降值进行预测的方法。 ○3运用模糊综合评价法对基坑周边的历史建筑物进行安全性评估。提出影响其安全性的评判因子，对影响建筑物安全的评判因子进行划分，应用层次分析法分析各个评判因子的权重。 ○4依托上海古北财富中心西侧申康宾馆1#楼，利用神经网络技术对建筑物的沉降进行预测，对沉降的预测值和最终实际监测值进行对比分析。根据建筑物的影响因子对开挖过程中建筑物的安全性进行评估。通过分析，在各个工况下，申康宾馆1#楼未出现明显的危险点，主体结构不受影响，，基本上都处于B级安全状态，同时根据施工后期的监测数据表明模糊综合评判法在临近深基坑的建筑物安全性评估方面是可行的、合理的。本文为今后同类基坑工程施工提供了一定的参考。
[Abstract]:The foundation pit under construction in prosperous urban areas will be restricted by surrounding roads, buildings, municipal pipe networks and so on. In the process of foundation pit excavation, not only the safety of foundation pit itself should be considered, but also the influence of excavation on the surrounding environment, especially some important buildings. The security problem of buildings around deep foundation pit has become a general and significant research topic. Based on the foundation pit project of Shanghai Gubei Wealth Center, taking the building of the Shenkang Hotel around the foundation pit as an example, the settlement value of the building is forecasted by neural network technology, and the safety evaluation is carried out according to the influence factors of the building. The main tasks are as follows: According to the characteristics of soft soil area in Shanghai, the interaction and stress distribution between soil during excavation of deep foundation pit are studied, and the ground settlement around the foundation pit is simulated, and the law of ground settlement around the foundation pit is analyzed. 02 using the neural network technology, the method of predicting the settlement value of the surrounding buildings is put forward according to the excavation depth, the distance between the building and the foundation pit edge, the cohesion of the soil layer, the angle of internal friction, and the gravity of the soil mass. The fuzzy comprehensive evaluation method is used to evaluate the safety of the historical buildings around the foundation pit. The evaluation factors affecting the safety of buildings are put forward, and the weight of each factor is analyzed by using the analytic hierarchy process (AHP). 04 based on the Xixi Shenkang hotel building of Shanghai Gubei Wealth Center, using the neural network technology to forecast the settlement of the building, the settlement prediction value and the final actual monitoring value were compared and analyzed. The safety of the building during excavation is evaluated according to the influence factors of the building. Through analysis, under various working conditions, there is no obvious danger point in the building of the Shinkang Hotel 1#, the main structure is not affected, and basically all of them are in a B level safe state. At the same time, according to the monitoring data of the later stage of construction, the fuzzy comprehensive evaluation method is feasible and reasonable in evaluating the safety of buildings near the deep foundation pit. This paper provides a certain reference for similar foundation pit construction in the future.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU433

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