西安地裂缝调查—对房屋条形基础破坏机理研究

发布时间：2018-04-09 17:06

本文选题：地裂缝　切入点：避让土地经济损失　出处：《西安工业大学》2017年硕士论文

【摘要】：西安是受地裂缝危害最严重的城市之一,由于采取了避让措施,地裂缝带来的直接破坏正在减小,造成的间接破坏正逐渐增多,尤其是土地浪费越来越严重。西安地裂缝造成的土地浪费,变成地裂缝灾害的重要表现。而西安地裂缝造成的直接破坏,以跨地裂缝条形基础最多也最为典型。以往的地裂缝灾害调查的方向侧重于地裂缝造成的直接破坏,本文从地裂缝的间接影响入手,从经济价值的角度对西安地裂缝避让土地的浪费做出分析。通过估算出地裂缝避让土地总面积,以商品房价格估算出居住用地的经济价值。运用层次分析法(AHP),结合不同因素对不同的城市建设用地类型的影响做出分析,计算出不同类型的城市建设用地的经济价值权重。根据不同城市建设用地与居住用地的比值,计算出不同城市建设用地的经济价值。最后计算出地裂缝避让土地损失的经济价值为323亿元。本文通过FLAC3D有限元软件对跨地裂缝条形基础的破坏过程进行了模拟。通过建立条形基础在地裂缝倾角为60°、75° 90°的有限元模型,得出他们不同阶段的位移、最大应力、剪切应变、屈服区等云图,研究跨地裂缝条形基础的破坏过程,探查不同倾角下地裂缝对条形基础的破坏影响,得出了地裂缝倾角对跨地裂缝条形基础的影响程度。通过地裂缝位于基础中点和四分之一处的模型,研究地裂缝位于不同位置下条形基础的破坏过程。对局部拆除法在跨地裂缝条形基础框架结构的应用进行分析,运用SAP2000对沉降进行模拟,通过结构内力变化,得出跨地裂缝框架结构的破坏规律,局部拆除法应在框架柱破坏前运用。
[Abstract]:Xi'an is one of the cities most seriously damaged by ground fissures. The direct damage caused by ground fissures is decreasing, and the indirect damage caused by them is increasing gradually, especially the waste of land is becoming more and more serious.The waste of land caused by the ground fissures in Xi'an has become an important manifestation of the ground fissures disaster.The direct damage caused by Xi'an ground fissures is the most typical of the cross-ground fissures.In the past, the direction of the investigation of the ground fissures focused on the direct damage caused by the ground fissures. This paper starts with the indirect influence of the ground fissures, and analyzes the waste of the land avoided by the ground fissures in Xi'an from the angle of economic value.The economic value of residential land is estimated by estimating the total land area of land fissures.By using the analytic hierarchy process (AHP) and combining different factors to analyze the influence of different types of urban construction land, the weight of economic value of different types of urban construction land is calculated.According to the ratio of construction land to residential land in different cities, the economic value of construction land in different cities is calculated.Finally, the economic value of land fissures to avoid land loss is calculated to be 32.3 billion yuan.In this paper, the failure process of cross-ground crack strip foundation is simulated by FLAC3D finite element software.By establishing a finite element model of strip foundation with an inclination angle of 60 掳to 75 掳90 掳, a cloud map of their displacement, maximum stress, shear strain and yield zone at different stages is obtained, and the failure process of striped foundation is studied.The influence of ground fissure on strip foundation under different dip angles is investigated, and the degree of influence of dip angle on stripe foundation is obtained.Based on the model of ground fissure at the middle point of foundation and 1/4, the failure process of strip foundation under different positions of ground fissure is studied.This paper analyzes the application of partial demolition method in cross-ground fissure strip foundation frame structure, simulates the settlement by using SAP2000, and obtains the failure law of cross-ground crack frame structure by changing the internal force of the structure.The partial demolition method should be used before the frame column is destroyed.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU470

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