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宜巴高速公路沿线穿越多达几十处地质条件复杂的岩堆,给宜巴高速公路的建设和运营提出了严峻的考验。为此,以宜巴高速公路典型的三里花岩堆为研究对象,从地层岩性、岩堆岸坡、气候变化和其他各种因素的综合影响作用,对岩堆形成机理与破坏模式进行深入的研究。三里花岩堆的形成是由于第四纪新构造运动使地壳大面积的强烈抬升,造成河流的剧烈下切,使山谷高差达数百米,自然山坡出现临空面产生的,在其形成过程中,内动力作用引起了地形地貌的差异并为岩堆的形成提供了物质基础,外动力作用则进一步改造了岩堆的地表形态,造成岩堆的地质结构发生变化。三里花岩堆存在浅层失稳(或局部失稳)和深层失稳(或整体失稳)两种可能的破坏模式。这些研究结论为宜巴高速公路岩堆的稳定性评价、治理措施设计与施工提供了重要依据。
The Yiba highway runs through dozens of rock masses with complex geological conditions and poses a severe challenge to the construction and operation of Yiba Expressway. Therefore, taking the typical Sanlihua rock mass of Yiba expressway as the research object, the forming mechanism and failure mode of rock mass are deeply studied from the comprehensive influence of formation lithology, rock bank slope, climate change and other various factors Research. The formation of the Sanlihua rock mass is due to the Quaternary Neotectonic movement which resulted in the intense uplift of the crust over a large area, resulting in the drastic undercutting of the river and the elevation difference of several hundred meters in the valley. The internal and external forces cause the topography difference and provide the material basis for the formation of the rock mass. The external dynamic action further modifies the surface morphology of the rock mass and changes the geological structure of the rock mass. There are two possible failure modes of Sanlihua rock mass: shallow instability (or partial instability) and deep instability (or overall instability). The conclusions of these studies provide an important basis for the stability evaluation of Yibba Expressway piles and the design and construction of treatment measures.