断层带高路堑边坡稳定性分析及其防护技术研究

发布时间：2018-11-02 18:52

【摘要】：国家基础设施的建设,尤其是高等级公路的建设,为满足线形的需要,势必会产生大量的路堑高边坡,这些高边坡自身岩性条件差异较大,强度低的岩土体受开挖扰动及降雨影响,可能会发生失稳破坏,造成人员财产损失。工程实践表明,大部分的边坡破坏发生在断层、软弱夹层等结构面上,因此,开展断层破碎带路堑高边坡的稳定性分析及其防护技术研究很有必要。本文结合高平至沁水高速公路具有代表性的高边坡工程实际,通过现场调研、理论分析及数值模拟,探讨工程沿线边坡的破坏模式及破坏机理,分析边坡现阶段和一级边坡开挖后的应力和变形特征,评价边坡在天然条件及暴雨条件下的稳定性。研究结果表明:边坡破坏形式以“滑移—拉裂”为主,易发生滑动失稳,坡内所含页岩软弱夹层和降雨下渗是其破坏的主要因素;在暴雨条件下,该边坡处于不稳定状态,降雨对边坡现阶段的稳定性影响较大,一级边坡开挖后,边坡安全系数降低,最大水平位移增大,应力发生重分布,坡脚出现应力集中现象。提出以微型钢管桩+锚索抗滑桩+预应力锚索地梁+仰斜排水孔的组合防护形式防治边坡的工程技术。论文研究成果可为依托工程提供理论与技术指导,对高等级公路岩质路堑边坡的设计和防护有一定的参考价值。
[Abstract]:The construction of national infrastructure, especially the construction of high-grade highways, is bound to produce a large number of cutting high slopes in order to meet the needs of alignment, and the lithologic conditions of these high slopes are quite different. Under the influence of excavation disturbance and rainfall, rock and soil with low strength may lose stability and property. Engineering practice shows that most of the slope failure occurs on structural surfaces such as fault and weak intercalation. Therefore, it is necessary to study the stability and protection technology of high slope in fault broken zone. Combined with the representative high slope engineering practice of Gao Ping to Qinshui Expressway, through field investigation, theoretical analysis and numerical simulation, this paper discusses the failure mode and failure mechanism of the slope along the engineering line. The stress and deformation characteristics of the slope at present and after excavation are analyzed, and the stability of the slope under natural and rainstorm conditions is evaluated. The results show that the main failure form of the slope is "slip-pull crack", which is prone to slip and instability, and the main factors are the shale weak intercalation and rainfall infiltration in the slope. Under the condition of heavy rain, the slope is in an unstable state, and the rainfall has a great influence on the stability of the slope at the present stage. After excavation, the safety factor of the slope decreases, the maximum horizontal displacement increases and the stress redistributes. Stress concentration occurs at the foot of the slope. The engineering technology of preventing and treating slope by the combined protection form of anchor cable anti-slide pile prestressed anchor cable earth beam with inclined drainage hole is put forward in this paper. The research results of this paper can provide theoretical and technical guidance for supporting engineering and have certain reference value for the design and protection of rock cut slope of high grade highway.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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