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受地形起伏较大、地质条件复杂等因素的制约,部分山区段管道采取横坡敷设,该敷设方式存在安全隐患,有必要对管道横坡敷设条件下的边坡稳定性进行定量分析,制定有针对性的治理措施,确保管道施工和运行安全。基于此,研究了管道横坡敷设诱发的地质灾害特点,采用基于极限平衡理论的条分法进行定量计算,取得原始边坡、扫线边坡及管沟开挖边坡3种工况条件下的稳定系数,并对计算结果进行了分析。结果表明,原始边坡表现得最为稳定,随着扫线和管沟开挖工作的展开,边坡稳定性越来越差。提出避让、治理、防护、限制4种建议措施,并应用于陕京输气管道穿越山间沟谷地段,保障了管道在山区地质灾害条件下的安全运营。
Due to the large topography and complex geological conditions and other factors, some sections of the mountain section of the pipeline to take a cross slope laying, the laying of a security risk exists, it is necessary to conduct a quantitative analysis of the stability of the slope under the conditions of the laying of cross-slope pipelines to develop a Targeted measures to ensure the safety of pipeline construction and operation. Based on this, the characteristics of geological disasters induced by laying of cross-slope pipelines are studied. The striping method based on the theory of limit equilibrium is used to quantitatively calculate the original slope, sweep-line slope and trench ditch excavation conditions The stability coefficient, and the calculation results were analyzed. The results show that the original slope is the most stable, and the stability of the slope is getting worse with the development of sweep line and trench excavation. Proposed four kinds of measures of avoidance, control, protection and restriction, and applied them to the Shaanxi-Beijing gas pipeline to cross the valley between the mountainous valleys to ensure the safe operation of the pipeline under the condition of mountainous geological disasters.