| 付东林,王立朝,刘明学,陈 亮,侯圣山,冯 振,高 晖.甘肃岷县西寨镇板岩斜坡发生变形条件的模型验证[J].甘肃地质,2025,(1):42-47 |
| 甘肃岷县西寨镇板岩斜坡发生变形条件的模型验证 |
| Modeling Verification of Gravity Flexing and Deformation of Slate Slope in Xizhai Town ｏf Minxian County， Gansu Province |
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| DOI： |
| 中文关键词: 板岩斜坡 重力作用特征 变形发生条件 单个板体模型 |
| 英文关键词:slate slope occring condition and characteriscs of gravity flexing reverse inclination or dumping at surface and near surface depth range high inclination angle or near upright in the deep underground single-board model |
| 基金项目:中国地质调查局洮河流域中游灾害地质调查项目（DD20190645） |
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| 中文摘要: |
| 1 ∶ 5万图幅地质灾害调查工作中，在甘肃省岷县秦许镇泥地族村、西寨镇站里村、清水乡柏杨沟等地均发现不同程度的板岩斜坡发生变形，即板岩斜坡发生反倾或倾倒，变形一般发生在地表、近地表深度范围，在地下深部则呈高倾角或近直立的状态。通过地质调查，从地层构造、产状、岩体强度特征和大气降水等方面分析了西寨镇板岩斜坡变形发生条件和基本特征，建立了单个板体模型。研究表明，单个板体以B点为支点、在垂直于Y轴的平面内旋转，当板面走向与斜坡凌空面（YOZ平面）走向相交且交角从0°到90°变化时，（1）当板岩厚度等于0. 01 ~ 0. 1 a时，单个板体的极限平衡重力力矩呈单调递增趋势；（2）当板岩厚度大于 0. 1 a时，重力力矩呈先递增、近尾部时又下降的趋势，总体上来说重力力矩亦呈单调递增趋势；证明了当交角趋于0°即大体平行时斜坡处于最低稳定状态。 |
| 英文摘要: |
| With the development of 1 ∶ 50 000 Minxian map geological survey of disasters, the geological phenomenon of deformation（which is reverse inclination or dumping） in the mountain slate strata was found in the survey areas of Nidi nationality village, Qinxu town, Zhanli village, Xizhai town, and Baiyanggou, qingshui town in Minxian county. In the same time its occurrence has the same patterns, it only occurs at surface and near surface depth range and its strata exists in a high inclination angle or near upright state in the deep underground. By the ancient ways of geological surveying and investigation, drilling trenching and geophysical prospecting etc., we counted, analysed and suggested the occuring condition and characteriscs of deformation, which has a favorable free surface, thin layer and high dip angle of rock mass, which the strike of the slate rock layer is roughly parallel to the strike of the slope's free surface, the strength characteristics of anisotropy in slate rock mass and atmospheric precipitation etc..It builts a single plate-body model, which with point B as a pivot the single plate body rotates in a plane perpendicular to the Y axis, and when the slaslab surface direction intersects the direction of the slope surface （YOZ plane） and the intersection angle θ changes from 0° to 90°, it has two results that: （1） the limit equilibrium gravity moment M of a single plate shows a monotonic increasing trend at
c = （0. 01 ~ 0. 1） a; （2）the gravitational moment M increases first and decreases again near the tail, and generally the gravity moment M also shows a monotonous increasing trend at c = （ > 0.1） a. So it proves that the slope is in the lowest stable state when the intersection angle θ tends to 0° or roughly parallel.Though the paper will can guide us in safety assessment and engineering construction by and into slate-rocky slope. |
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