【摘要】：國家基礎設施的建設,尤其是高等級公路的建設,為滿足線形的需要,勢必會產(chǎn)生大量的路塹高邊坡,這些高邊坡自身巖性條件差異較大,強度低的巖土體受開挖擾動及降雨影響,可能會發(fā)生失穩(wěn)破壞,造成人員財產(chǎn)損失。工程實踐表明,大部分的邊坡破壞發(fā)生在斷層、軟弱夾層等結構面上,因此,開展斷層破碎帶路塹高邊坡的穩(wěn)定性分析及其防護技術研究很有必要。本文結合高平至沁水高速公路具有代表性的高邊坡工程實際,通過現(xiàn)場調研、理論分析及數(shù)值模擬,探討工程沿線邊坡的破壞模式及破壞機理,分析邊坡現(xiàn)階段和一級邊坡開挖后的應力和變形特征,評價邊坡在天然條件及暴雨條件下的穩(wěn)定性。研究結果表明:邊坡破壞形式以“滑移—拉裂”為主,易發(fā)生滑動失穩(wěn),坡內所含頁巖軟弱夾層和降雨下滲是其破壞的主要因素;在暴雨條件下,該邊坡處于不穩(wěn)定狀態(tài),降雨對邊坡現(xiàn)階段的穩(wěn)定性影響較大,一級邊坡開挖后,邊坡安全系數(shù)降低,最大水平位移增大,應力發(fā)生重分布,坡腳出現(xiàn)應力集中現(xiàn)象。提出以微型鋼管樁+錨索抗滑樁+預應力錨索地梁+仰斜排水孔的組合防護形式防治邊坡的工程技術。論文研究成果可為依托工程提供理論與技術指導,對高等級公路巖質路塹邊坡的設計和防護有一定的參考價值。
[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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.1

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