| 小秦岭金矿区碾头岔矿渣型泥石流特征值计算 |
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| 引用本文： | 张江华,徐友宁,陈华清,柯海玲,吝哲峰,赵学理.小秦岭金矿区碾头岔矿渣型泥石流特征值计算[J].地质通报,2015,34(11):2024-2030. |
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| 作者姓名： | 张江华 徐友宁 陈华清 柯海玲 吝哲峰 赵学理 |
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| 作者单位： | 1.中国地质调查局西安地质调查中心，陕西 西安 710054；
2.国土资源部黄土地质灾害重点实验室，陕西 西安 710054；
3.国土资源部陕西潼关矿山地质环境野外科学观测研究基地，陕西 西安 710054；
4.陕西核工业工程勘察院，陕西 西安 710054 |
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| 基金项目： | 中国地质调查局项目（编号：1212011140024）、国家自然科学基金项目（批准号：40872288）和陕西省自然科学基础研究计划项目（编号：2015JM4129） |
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| 摘 要： | 泥石流的运动参数是泥石流研究的主要内容和防治设计的重要基础。以矿渣型泥石流为对象,通过地形测量和工程地质测绘查明,碾头岔地形陡峻,沟道顺直,为泥石流的形成提供了有利的地形条件。通过钻探、坑槽探发现可能的物源包括矿渣、坡面松散层及小型沟岸滑塌体。工程力学分析表明,采矿废渣在自重状态下的稳定性系数为1.022~1.063,处于欠稳定和基本稳定之间;在自重+暴雨状态下,稳定性系数介于0.889~0.947之间,属于不稳定状态,是研究区内的主要物源。根据降雨量数据计算出碾头岔沟最大洪峰流量大于30m~3/s。在此水动力条件下,预测了泥石流发生时流体重度值为22.80k N/m~3,泥石流流速为5.11m/s;估算了20年、50年和100年一遇洪水的泥石流流量分别为4.31m~3/s、44.6m~3/s和95.5m3~/s,计算得到泥石流整体冲击力为58.34k Pa,超高2.13m,泥石流堆积区的最大危险范围0.21km~2,为小秦岭金矿区矿渣型泥石流防治工程方案的设计提供了基础参数。
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| 关 键 词： | 矿渣型泥石流 起动参数、运动参数 小秦岭金矿区 |
The calculation of characteristic values of Niantoucha slag debris flow in the Xiaoqinling gold mining area |
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| ZHANG Jianghu,XU Youning,CHEN Huaqing,KE Hailing,LIN Zhefeng,ZHAO Xueli.The calculation of characteristic values of Niantoucha slag debris flow in the Xiaoqinling gold mining area[J].Geologcal Bulletin OF China,2015,34(11):2024-2030. |
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| Authors: | ZHANG Jianghu XU Youning CHEN Huaqing KE Hailing LIN Zhefeng ZHAO Xueli |
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| Abstract: | The debris motion parameters constitute an important foundation for the main contents of debris flow and control design. With the slag debris flow as the study object and through topographic survey and geological mapping, the authors found that the Niantoucha area is characterized by steep land form and straight gullies, which provides favorable topographic conditions for the formation of debris flow. Drilling and trenching detected that the sources probably include slag, slope loose layers and small gully slump. Engineering geomechanics analysis shows that the stability coefficient of the mining slag is 1.022-1.063 under the condition of dead weight, lying between not very stable and basically stable; under the condition of dead weight plus heavy rain, the stability coefficient is 0.889-0.947, belonging to the instable condition. So slag is a major debris flow material source. Calculation based on the rainfall shows that the maximum peak discharge should be over 30m3/s. Under such a hydrodynamic condition, It is predicted that the weight of the debris flow is 22.80kN/m3, and the velocity of the debris flow is 5.11m/s. The debris flow discharge rates during the flood at intervals of 20 years, 50 years and 100 years are estimated to be 4.31m3/s, 44.6m3/s and 95.5m3/s respectively. The overall impact of mudslides should be 58.34kPa, 2.13m in excess of the height. The maximum hazard range of the debris flow accumulation is 0.21km2. These data provide basic parameters for the design of the engineering scheme for prevention and control of slag debris flow in the Xiaoqinling gold mining area. |
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| Keywords: | slag debris flow starting parameter motion parameter Xiaoqinling gold mining area |
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