某抽水蓄能电站堆渣场危险性预测分析
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青海省有色第三地质勘查院

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TV221

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青海省青藏高原北部地质过程与矿产资源重点实验室开放课题(2019-KY-01);青海省科技计划项目(2018-ZJ-714)


Risk prediction of slag dump in a pumped storage power station
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The Third Nonferrous Metals Geological Exploration Institute of Qinghai Province

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    摘要:

    山区水利工程、交通工程建设等往往产生大量的弃渣堆积体,其稳定性对生态环境和工程设施的安全运行至关重要。因此,弃渣场的稳定性评价和失稳后的危险性预测对于弃渣场位置选择和设计具有重要意义。某抽水蓄能电站最大的弃渣场位于天然冲沟上游沟脑,容积约700万m3,最大高度240米,冲沟中、下游右岸拟建地面开关站、地面通风洞出口、地面排风平台等设施。为了评价弃渣场失稳后对沟内建筑物的影响,首先基于弃渣场及冲沟工程地质条件评价了弃渣场稳定性,然后采用三维离散元软件(PFC, Particle Flow Code)研究了弃渣场失稳后的动力过程及其对沟内设施的危害性。结果表明:虽然渣场再天然状态下处于稳定状态,但在持续强降雨作用下仍可能发生失稳滑动,堆渣体失稳后将向冲沟下游运动,并与岸坡发生2次强烈碰撞,最终堆积在冲沟内,通风洞出口、地面排风平台将会受到冲击并被掩埋。由此可见,上述分析将为渣场及沟内设施的设计提供科学指导,并为同类工程危险性预测提供一种可以借鉴的方法。

    Abstract:

    Engineering construction (e.g. water conservancy project, transportation engineering, and so on) in mountain areas bring mass of discarded soil and rock, whose stability is critical to the ecological environment and the safe operation of engineering facilities. For this reason, engineering assessment on stability and dynamic analysis after failure are important for the selection and design of landfills. The biggest Disposal site of Pumped Storage Power Station Project in Hunyuan County, Shanxi Province, China, with a volume of 7 million m3 and a maximum height of 240 m, is to be located at the upstream of Mahua Valley. To evaluate the impact of the slag dump on the buildings in the ditch, the kinematic process and the effect of the deposit mass on the engineering facilities were conducted by numerical simulation, utilizing PFC, depending on the depict of the engineering geological condition of the deposit area. Our simulation results clearly display scenario-based debris mass run-out paths and indicate that, considering the worst case scenario, the ground ventilation platform and ventilation tunnel exit might be rapidly destroyed by landslide debris. The results are useful information for decision support and future hazard assessment.

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陈丰兰. 某抽水蓄能电站堆渣场危险性预测分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-11-03
  • 最后修改日期:2022-04-27
  • 录用日期:2022-04-30
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