林织线纳界河桥址岸坡岩体稳定性研究
发布时间：2018-11-09 07:40
【摘要】：随着国家对西南地区铁路建设的大力支持,贵州响应国家号召,规划和建设了许多条意义深远的铁路线。林织铁路作为贵州铁路建设中一条重要的线路,其顺利的建设和运营对贵州的经济和产业结构意义重大。林织铁路全长99.559km,沿线穿越多个构造单元,地质条件复杂,线路桥梁隧道十分常见。其中纳界河特大桥岸坡陡峭,岩性复杂,岩体被多组节理切割,岩体破碎,是整个线路建设的难点。能够顺利完成纳界河特大桥对林织线整个线路意义重大。本论文的研究目的：对纳界河特大桥桥址岸坡岩体的结构面强度评价；运用经验公式确定岸坡稳定坡脚；运用离散元软件确定岸坡岩体的破坏模式；运用有限元软件确定岸坡稳定性。本论文的主要研究内容和研究成果：(1)通过对现场左右两侧岸坡的地质情况进行调查,对现场地质情况有了比较充分的了解,测得了多组结构面的产状、张开度以及节理间距等控制岩体质量的因素。(2)通过巴顿模型求得了结构面的强度,运用赤平投影法对左右两岸单一以及楔形结构面稳定性进行分析。得到坡面错落崩塌将是两岸边坡破坏的主要形式的结果。(3)通过经验公式算得纳界河特大桥左岸天然稳定坡角为65°；右岸天然稳定坡角59°。,对荷载作用下边坡的稳定有一定借鉴意义。(4)通过离散单元法对岸坡变形破坏模式进行分析发现,自然无外力扰动条件下,两侧岸坡处于缓慢发展阶段,坡面整体比较平稳,只是在变坡点等局部部位相对比较危险,存在一定崩塌可能。桥梁施加荷载主要影响基座上部岩体稳定性,对基座附近岩体的稳定性不会产生太大影响。(5)通过有限单元法对桥梁两岸岸坡安全系数进行计算,天然状态和加桥梁荷载作用下,左右两岸岸坡稳定性系数分别为1.60、1.90,1.30、1.40。因此两岸岸坡在两种工况下都基本稳定。(6)因左岸陡壁处岩体风化强烈,节理裂隙发育,且发现已有错落体,建议对风化岩体进行锚固。两岸边坡底部均发育节理裂隙及层理,建议对底部节理裂隙进行喷浆加固处理。纳界河两岸边坡均为灰岩及白云质灰岩,底部因靠近河水而发生溶蚀并形成孔洞及临空面,建议采取溶洞灌浆、坡体表面排水等处理措施。
[Abstract]:With the great support of the state to the railway construction in southwest China, Guizhou has planned and built many railway lines of far-reaching significance in response to the call of the state. As an important railway line in Guizhou railway construction, the smooth construction and operation of forestry railway is of great significance to the economic and industrial structure of Guizhou. LinzhouRailway is 99.559 km in length and passes through many structural units. The geological conditions are complicated and the route and bridge tunnels are very common. The steep bank slope, complex lithology, rock mass cut by multiple joints and broken rock mass are the difficulties of the whole line construction. It is of great significance for the whole line of forest weaving to be able to successfully complete the Najie River Bridge. The purpose of this paper is to evaluate the structural plane strength of the slope rock mass at the site of the Najiehe Bridge, to determine the stable slope foot by empirical formula, to determine the failure mode of the slope rock mass by using discrete element software. The stability of bank slope is determined by finite element software. The main research contents and results of this paper are as follows: (1) through the investigation of the geological conditions on the left and right sides of the site, the geological conditions in the field are fully understood, and the occurrence of many groups of structural surfaces is measured. (2) the strength of the structural plane is obtained by using the Barton model, and the stability of the single and wedge-shaped structural plane is analyzed by using the plain projection method. The results of slope collapse will be the main form of slope failure on both sides of the bank. (3) the natural stable slope angle of the left bank of Nanjie River Bridge is 65 掳by empirical formula; The natural stable slope angle on the right bank is 59 掳, which is useful for the stability of the slope under load. (4) through the analysis of the deformation and failure mode of bank slope by discrete element method, it is found that, under the condition of natural disturbance without external force, The slope on both sides is in the stage of slow development, the whole slope is relatively stable, but it is relatively dangerous in some parts, such as the variable slope, and there is a possibility of collapse. The load exerted by the bridge mainly affects the stability of the rock mass in the upper part of the foundation, and will not have much effect on the stability of the rock mass near the foundation. (5) the safety factor of the bank slope on both sides of the bridge is calculated by the finite element method. Under natural condition and bridge load, the slope stability coefficient of left and right banks is 1.601.90 ~ 1.30g / 1.40 respectively. Therefore, the bank slope on both banks is basically stable under both conditions. (6) because of the strong weathering of the rock mass at the steep wall of the left bank and the development of joints and fissures, it is suggested that the weathered rock body be anchored. Joint fissures and bedding are developed at the bottom of both sides of slope. The slope on both banks of Najie River is limestone and dolomitic limestone, and the bottom of the slope is dissolved near the river and forms holes and voids. It is suggested to take some treatment measures such as cavity grouting, surface drainage of slope body and so on.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.84
本文编号：2319780
[Abstract]:With the great support of the state to the railway construction in southwest China, Guizhou has planned and built many railway lines of far-reaching significance in response to the call of the state. As an important railway line in Guizhou railway construction, the smooth construction and operation of forestry railway is of great significance to the economic and industrial structure of Guizhou. LinzhouRailway is 99.559 km in length and passes through many structural units. The geological conditions are complicated and the route and bridge tunnels are very common. The steep bank slope, complex lithology, rock mass cut by multiple joints and broken rock mass are the difficulties of the whole line construction. It is of great significance for the whole line of forest weaving to be able to successfully complete the Najie River Bridge. The purpose of this paper is to evaluate the structural plane strength of the slope rock mass at the site of the Najiehe Bridge, to determine the stable slope foot by empirical formula, to determine the failure mode of the slope rock mass by using discrete element software. The stability of bank slope is determined by finite element software. The main research contents and results of this paper are as follows: (1) through the investigation of the geological conditions on the left and right sides of the site, the geological conditions in the field are fully understood, and the occurrence of many groups of structural surfaces is measured. (2) the strength of the structural plane is obtained by using the Barton model, and the stability of the single and wedge-shaped structural plane is analyzed by using the plain projection method. The results of slope collapse will be the main form of slope failure on both sides of the bank. (3) the natural stable slope angle of the left bank of Nanjie River Bridge is 65 掳by empirical formula; The natural stable slope angle on the right bank is 59 掳, which is useful for the stability of the slope under load. (4) through the analysis of the deformation and failure mode of bank slope by discrete element method, it is found that, under the condition of natural disturbance without external force, The slope on both sides is in the stage of slow development, the whole slope is relatively stable, but it is relatively dangerous in some parts, such as the variable slope, and there is a possibility of collapse. The load exerted by the bridge mainly affects the stability of the rock mass in the upper part of the foundation, and will not have much effect on the stability of the rock mass near the foundation. (5) the safety factor of the bank slope on both sides of the bridge is calculated by the finite element method. Under natural condition and bridge load, the slope stability coefficient of left and right banks is 1.601.90 ~ 1.30g / 1.40 respectively. Therefore, the bank slope on both banks is basically stable under both conditions. (6) because of the strong weathering of the rock mass at the steep wall of the left bank and the development of joints and fissures, it is suggested that the weathered rock body be anchored. Joint fissures and bedding are developed at the bottom of both sides of slope. The slope on both banks of Najie River is limestone and dolomitic limestone, and the bottom of the slope is dissolved near the river and forms holes and voids. It is suggested to take some treatment measures such as cavity grouting, surface drainage of slope body and so on.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.84
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