复杂地质构造条件下高速公路压煤采动影响区桥梁结构适应性研究

发布时间：2018-07-22 11:54

【摘要】：到目前为止国内外针对建筑物、水体以及铁路下压煤开采的研究比较多，但针对在高速公路桥梁压煤开采的研究还比较少，分析理论还不够完善。煤炭作为我国主要能源，随着社会经济的快速发展，需求量越来越大，其不可再生性要求尽可能的开采出煤炭资源，但是受地质构造控制，煤层的采动后对高速公路桥梁的影响必须充分研究，并在设计中提出针对性适应措施，方能确保高速公路桥梁的运营安全。本文以南川至万盛高速公路为依托，在分析压覆煤层采动后地表移动和变形的基础上，根据唐山院预测分析工作得出来的各个受影响桥梁布置点的具体的下沉、倾斜等预计变形数值，统计分析南万高速公路桥梁结构受采动沉降、倾斜、水平移动等变形的影响最不利的情况，，运用ABAQUS模拟这些最不利的情况，计算验算受影响桥梁结构的安全性。根据安全性的验算结果，对桥梁结构提出必要的措施来适应煤层开采后的变形，为类似高速公路桥梁设计提供参考。主要的研究内容包括： ①以重庆南万高速公路为典型实例，通过对沿线路段的地质构造、地层、水文的勘察及煤层分布与桥梁位置关系的分析，论述了桥梁煤层开采地质的复杂性； ②根据各个受影响桥梁布置点的具体沉降、倾斜、水平移动数据，分别绘制出各座桥梁布置点的沉降、倾斜、水平移动曲线图，分析对比这些因素，得出桥梁结构产生最不利的影响的结构工况例如纵向、横向倾斜会使桥墩偏心受压； ③将各种最不利的沉降、倾斜、水平移动对桥梁结构的梁体、桥墩、支座等的影响，运用ABAQUS进行模拟，分析计算桥梁结构受到这些不利情况的应力、应变情况，验算其安全性； ④根据验算的安全性结果，以及模型的破坏规律，提出相应的必要措施来适应煤层开采后的变形，保证高速公路桥梁能够安全运营。
[Abstract]:Up to now, there are many researches on coal mining under buildings, water bodies and railways at home and abroad, but there are few researches on coal mining in expressway bridges, and the theory of analysis is not perfect. As the main energy in our country, with the rapid development of social economy, the demand for coal is increasing. Its non-renewable requirement is to exploit coal resources as far as possible, but it is controlled by geological structure. The influence of coal seam mining on highway bridge must be fully studied, and appropriate measures should be put forward in the design to ensure the safety of highway bridge operation. Based on Nanchuan to Wansheng Expressway, based on the analysis of ground surface movement and deformation after mining of overlying coal seam, the concrete subsidence of each affected bridge layout point is obtained according to the prediction and analysis work of Tangshan Yuan. The predicted deformation values such as inclination, etc., statistical analysis of the most disadvantageous conditions of the bridge structure of Nan-Wan Expressway affected by mining subsidence, inclination, horizontal movement, etc., using Abaqus to simulate these most disadvantageous conditions. Calculate the safety of the affected bridge structure. According to the results of safety check, the necessary measures for bridge structure are put forward to adapt to the deformation of coal seam after mining, which provides a reference for the bridge design of similar highway. The main research contents are as follows: 1 taking Nanwan Expressway in Chongqing as a typical example, by analyzing the geological structure, strata, hydrological investigation and the relationship between coal seam distribution and bridge location, The complexity of bridge coal seam mining geology is discussed, 2 according to the specific settlement, tilt and horizontal movement data of each affected bridge layout point, the settlement, inclination and horizontal movement curve of each bridge layout point are drawn respectively. By analyzing and comparing these factors, it is concluded that the structural conditions which have the most adverse effects on the bridge structure, such as longitudinal, transverse tilt, will make the pier eccentric under pressure; (3) the most unfavorable settlement, inclination, etc. The influence of horizontal movement on the beam, pier and support of bridge structure is simulated by Abaqus to analyze and calculate the stress and strain of bridge structure subjected to these adverse conditions, and to check its safety. 4According to the safety result of checking calculation and the damage rule of the model, the necessary measures are put forward to adapt to the deformation after coal seam mining and to ensure the safe operation of highway bridge.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.5

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