重庆地区公路高边坡危岩稳定性分析与治理方法

发布时间：2019-04-11 12:58

【摘要】：本文以重庆市万州区三湾公路边坡危岩为典型代表进行分析,采用现场调查、数值模拟方法、刚体极限平衡分析法、运动学等研究手段,对重庆地区危岩失稳崩塌的危岩体特点、失稳模式、危岩稳定性、崩塌落石运动路径等问题进行深入研究,最后针对不同情况的危岩体,提出简单的治理措施建议。研究的主要内容： ①重庆地区危岩体特点重庆地区地质岩性组合以软硬岩互层为主要特征,在长期风化营力和重力作用下,容易发生差异风化,产生拉裂变形,形成危岩体。本文主要研究砂泥岩互层边坡的破坏方式与稳定性分析。 ②危岩体分布规律及失稳模式分析工程地质环境条件与危岩体发育特征与分布规律、变形破坏模式以及危岩体稳定性之间有着重要的联系,危岩体的形成是内在条件与外在条件共同作用的结果,本文对研究区的各种工程地质环境条件都做了较详细的阐述。勘查区危岩的失稳破坏方式主要为滑移式、倾倒式和坠落式三种基本类型。本文对每种失稳模式都做了比较详细的分析。 ③危岩体稳定性分析方法研究进行危岩体稳定性评价方法与影响危岩体稳定性的因素分析,从危岩形态及变形特征、控制危岩的结构面特征入手进行赤平极射投影图法分析,运用刚体极限平衡分析法进行计算分析。根据研究区边坡的工程地质条件、危岩体变形破坏模式、稳定性和危险性的综合评价,研究区边坡危岩体在天然状态下基本处于基本稳定～欠稳定状态,有可能失稳。 ④研究区危岩体失稳运动路径分析通过对落石路径的验算与模拟,可以得到落石过程的运动路径、最大落石距离、碰撞动能、弹跳高度等,但是,模拟过程计算量明显减小,省时省力,而计算需要过程验算与判断,费时费力；另外,路径模拟还可以方便的进行拦挡设置,进行落石路径模拟,可以方便的看出防治措施的效果,并为危岩防治提供依据。 Rocfall软件可以较好较快地为危岩防治提供依据,适时,可以运用计算方式进行辅助验算,以提高其准确性。 ⑤危岩体防治措施研究危岩治理措施采用锚固、清除、支撑、封闭岩腔等综合治理方法,对危岩顶部的裂隙进行封闭处理,并在卸荷带以外修截排水沟,坡脚修筑拦石网或拦石墙等。进行防护工程方案对比,比较充分的论证防护措施的可行性。
[Abstract]:In this paper, the dangerous rock of Sanwan highway slope in Wanzhou district of Chongqing is taken as the typical representative. The methods of field investigation, numerical simulation, rigid body limit equilibrium analysis, kinematics and so on are adopted. In this paper, the characteristics of dangerous rock mass, instability mode, stability of dangerous rock, movement path of rockfall and so on in Chongqing area are studied in depth. At last, according to different situations of dangerous rock mass, some simple control measures are put forward. The main contents of the study: 1the characteristics of dangerous rock mass in Chongqing area; the geological lithologic assemblage in Chongqing area is characterized by soft and hard rock interbeds; under the action of long-term weathering and gravity, it is easy to occur differential weathering, resulting in tensile and fracture deformation. A dangerous rock mass is formed. This paper mainly studies the failure mode and stability analysis of sand-mudstone interbedded slope. (2) Analysis of distribution law and instability mode of dangerous rock mass. There is an important relationship between engineering geological environment condition and development and distribution law of dangerous rock mass, deformation and failure mode and stability of dangerous rock mass. The formation of dangerous rock mass is the result of the interaction of internal and external conditions. In this paper, all kinds of engineering geological environment conditions in the study area are described in detail. The main failure modes of dangerous rock in the exploration area are slip type, overturning type and falling type. In this paper, every instability mode is analyzed in detail. (3) the stability analysis method of dangerous rock mass is studied, and the evaluation method of dangerous rock mass stability and the factors influencing the stability of dangerous rock mass are analyzed, from the view of dangerous rock shape and deformation characteristics, Starting with controlling the structural surface characteristics of dangerous rock, the projection method of polar projection is analyzed, and the rigid body limit equilibrium analysis method is used to calculate and analyze. According to the engineering geological conditions of slope in the study area, deformation and failure mode of dangerous rock mass, stability and risk comprehensive evaluation, the slope dangerous rock mass in the study area is basically stable or unstable in natural state, and it is likely to be unstable. 4The analysis of unstable movement path of dangerous rock mass in the study area can get the movement path of rock falling process, the maximum distance of falling rock, the kinetic energy of collision, the height of bouncing and so on by checking and simulating the path of falling rock. The computation amount of the simulation process is obviously reduced, and the time-saving and labor-saving, and the calculation requires the process checking calculation and judgment, which is time-consuming and laborious. In addition, the path simulation can also conveniently set up the blocking and drop the rock path, which can easily see the effect of the prevention and control measures, and provide the basis for the prevention and control of dangerous rocks. The Rocfall software can provide the basis for the prevention and cure of dangerous rock quickly. At the right time, the calculation method can be used to carry out the auxiliary checking calculation to improve its accuracy. (5) Prevention and control measures of dangerous rock mass; the control measures of dangerous rock adopt the comprehensive treatment methods of anchoring, clearing, supporting, sealing rock cavity, etc., to seal the cracks on the top of dangerous rock, and to repair drainage ditches outside the unloading zone. A stone-blocking net or wall, etc., is built at the foot of the slope. The feasibility of the protective measures is fully demonstrated by comparing the protective engineering schemes.
【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】：U416.14

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