基于现场监测的边坡安全评价指标研究
发布时间：2019-01-05 00:01
【摘要】：边坡的安全性评价在实际工程中有着重要意义。随着公路事业的日新月异,各种深挖高填的边坡已经不可避免,由此引起的边坡稳定性问题也是一个不能回避的重大问题。道路边坡失稳不仅会影响在路上行驶车辆的安全,还可能对道路自身造成损坏,导致交通中断甚至是永久的破坏,造成巨大的经济损失。严重的边坡失稳问题不仅关乎社会经济利益,还会涉及人民生命安全。长期以来,边坡的安全性主要依靠边坡的设计工作来保证,但是设计工作中计算所得的安全系数仅仅是边坡在施工完成后的安全状况,并不能反映出边坡从开挖或填筑直到施工结束和日常使用这一过程中的安全状况。基于这一原因,诞生了现场监测技术并得到了广泛的应用。利用边坡现场监测手段能够对边坡在任何时段内的变形、应力和水文状况等信息进行监测,根据监测结果可以详细了解边坡所处环境和自身变化的情况,判断边坡在各监测时段内的安全状态。但是利用现场监测技术判定边坡的安全状况还存在较多的缺点和不足,目前通过现场监测判断和分析边坡稳定状况主要是通过监测手段获得边坡的变形等参数,针对所测得的参数设置一定的警戒值,如果监测结果接近或超过设定的警戒值则认定边坡处于预警或危险状态,反之则认为边坡属于稳定状态。但是这个警戒值的选取很大程度上是根据工作人员的经验确定,如果警戒值确定不当就很容易出现对边坡安全状态的错误判断。本文以典型的高边坡为研究对象,针对目前基于现场监测对边坡进行安全评价方法的不足,主要有以下内容:①.使用PLAXIS有限元分析软件建立边坡有限元模型,对边坡模型进行有限元分析得到位于边坡各部位的测点的位移值,由此分析边坡各部位的变形特征和规律,根据分析结果对边坡现场监测系统中监测点的布置提供建议;②.对现行的边坡安全系数计算方法做一定的了解和介绍,分析边坡自身及其周边环境等要素对边坡稳定性的影响程度;③.利用参数反演理论根据现场监测所得的边坡位移数据反演影响边坡稳定性的主要边坡土体强度参数,最终通过反演所得的边坡强度参数准确的计算边坡在各个监测时段的稳定系数,并据此对边坡的安全状态进行评价。
[Abstract]:Slope safety evaluation is of great significance in practical engineering. With the rapid development of highway industry, all kinds of deep excavation and high fill slopes have become inevitable, and the slope stability problem caused by it is also an important problem that can not be avoided. Road slope instability will not only affect the safety of vehicles driving on the road, but also may cause damage to the road itself, causing traffic disruption or even permanent damage, resulting in huge economic losses. Serious slope instability is not only related to social and economic interests, but also to the safety of people's lives. For a long time, the safety of the slope mainly depends on the design of the slope, but the safety factor calculated in the design work is only the safety condition of the slope after the completion of construction. It does not reflect the safety of the slope from excavation or filling up to the end of construction and daily use. Based on this reason, field monitoring technology was born and widely used. The deformation, stress and hydrological condition of the slope can be monitored at any time by using the field monitoring method of the slope. According to the monitoring results, the environment of the slope and its own changes can be understood in detail. To judge the safety state of the slope during each monitoring period. However, there are still many shortcomings and shortcomings in judging the safety condition of the slope by using the field monitoring technology. At present, the parameters of slope deformation are obtained by monitoring and analyzing the stability of the slope. A certain warning value is set for the measured parameters. If the monitoring result approaches or exceeds the set warning value, the slope is considered to be in an early warning or dangerous state, whereas the slope is considered to be in a stable state. However, the selection of the warning value is largely determined by the staff's experience. If the warning value is not properly determined, it is easy to misjudge the safety state of the slope. In this paper, the typical high slope as the research object, aiming at the shortcomings of the current safety evaluation method based on field monitoring, the main contents are as follows: 1. The PLAXIS finite element analysis software is used to establish the slope finite element model, and the displacement value of the measuring points located in each part of the slope is obtained by the finite element analysis of the slope model, and the deformation characteristics and rules of each part of the slope are analyzed. According to the results of the analysis, some suggestions are provided for the layout of monitoring points in the field monitoring system of slope. 2. The present calculation method of slope safety factor is introduced, and the influence degree of slope itself and its surrounding environment on slope stability is analyzed. 3. Based on the displacement data obtained from the field monitoring, the main soil mass strength parameters affecting the slope stability are retrieved by the parameter inversion theory. Finally, the stability coefficient of the slope in each monitoring period is calculated accurately by inversion of the slope strength parameters, and the safety state of the slope is evaluated accordingly.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.14
本文编号：2400979
[Abstract]:Slope safety evaluation is of great significance in practical engineering. With the rapid development of highway industry, all kinds of deep excavation and high fill slopes have become inevitable, and the slope stability problem caused by it is also an important problem that can not be avoided. Road slope instability will not only affect the safety of vehicles driving on the road, but also may cause damage to the road itself, causing traffic disruption or even permanent damage, resulting in huge economic losses. Serious slope instability is not only related to social and economic interests, but also to the safety of people's lives. For a long time, the safety of the slope mainly depends on the design of the slope, but the safety factor calculated in the design work is only the safety condition of the slope after the completion of construction. It does not reflect the safety of the slope from excavation or filling up to the end of construction and daily use. Based on this reason, field monitoring technology was born and widely used. The deformation, stress and hydrological condition of the slope can be monitored at any time by using the field monitoring method of the slope. According to the monitoring results, the environment of the slope and its own changes can be understood in detail. To judge the safety state of the slope during each monitoring period. However, there are still many shortcomings and shortcomings in judging the safety condition of the slope by using the field monitoring technology. At present, the parameters of slope deformation are obtained by monitoring and analyzing the stability of the slope. A certain warning value is set for the measured parameters. If the monitoring result approaches or exceeds the set warning value, the slope is considered to be in an early warning or dangerous state, whereas the slope is considered to be in a stable state. However, the selection of the warning value is largely determined by the staff's experience. If the warning value is not properly determined, it is easy to misjudge the safety state of the slope. In this paper, the typical high slope as the research object, aiming at the shortcomings of the current safety evaluation method based on field monitoring, the main contents are as follows: 1. The PLAXIS finite element analysis software is used to establish the slope finite element model, and the displacement value of the measuring points located in each part of the slope is obtained by the finite element analysis of the slope model, and the deformation characteristics and rules of each part of the slope are analyzed. According to the results of the analysis, some suggestions are provided for the layout of monitoring points in the field monitoring system of slope. 2. The present calculation method of slope safety factor is introduced, and the influence degree of slope itself and its surrounding environment on slope stability is analyzed. 3. Based on the displacement data obtained from the field monitoring, the main soil mass strength parameters affecting the slope stability are retrieved by the parameter inversion theory. Finally, the stability coefficient of the slope in each monitoring period is calculated accurately by inversion of the slope strength parameters, and the safety state of the slope is evaluated accordingly.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.14
【参考文献】
相关硕士学位论文 前1条
1 石长;基于ANSYS的岩土参数优化反分析和边坡稳定性分析[D];南京航空航天大学;2006年
，本文编号：2400979
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