| 地下采掘环境效应的一个特殊实例——韩城电厂地基隆起机制及其控制措施 |
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| 引用本文： | 张倬元,刘汉超.地下采掘环境效应的一个特殊实例——韩城电厂地基隆起机制及其控制措施[J].地学前缘,2001,8(2):285-295. |
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| 作者姓名： | 张倬元 刘汉超 |
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| 作者单位： | 成都理工学院 |
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| 基金项目： | 国家自然科学基金重点项目（49232050） |
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| 摘 要： | 韩城电厂地基隆起变形 ,自 2 0世纪 80年代初发现以来 ,迄今已有近 2 0a的持续变形史 ,前后实施过两次工程整治。首次整治基于该变形为一滑坡的前缘隆起 ,采取了抗滑桩、削方减载等措施。但整治后多年监测资料表明 ,变形并未终止 ,且两度上隆速率剧增为整治前的两倍。 1995— 1996年实施了以排水为先导的应急整治 ,在此期间 ,进行了地质勘察、相似材料模型模拟、离散元数值模拟等多项研究工作 ,从而对变形机制获取如下新认识 :大面积采空区直接顶板坍落后 ,坍落带上覆砂泥岩层就成为一个承受巨大上覆荷载的复合板梁 ,板梁的下陷弯曲变形伴有向山前方向发展的砂泥岩层之间的层间错动、离层和岩体扩容 ,从而产生了对厂区下伏基岩的侧推效应 ,侧推力使厂房地基下伏近水平砂泥岩层产生向上弯曲隆起的蠕动变形。显然 ,这是地下采掘引起的表生时效变形。一些人为因素引起的孔隙水压力升高 ,加剧了变形。采取排水措施后已将变形速率降至低于历史最低且建筑能够承受的水平。
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| 关 键 词： | 地下采掘 层间错动 离层 扩容 侧推效应 上隆 孔隙水压力效应 时效变形 |
| 文章编号： | 1005-2321(2001)02-0285-11 |
| 修稿时间： | 2000年10月16 |
A SPECIAL CASE HISTORY OF THE ENVIRONMENTAL IMPACT BY UNDERGOUND MINING ——THE MECHANISM AND CONTROL MEASURES OF THE GROUND UPHEAVAL DEFORMATION OF HANCHENG POWER PLANT |
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| ZHANG Zhuo-yuan,LIU Han-chao.A SPECIAL CASE HISTORY OF THE ENVIRONMENTAL IMPACT BY UNDERGOUND MINING ——THE MECHANISM AND CONTROL MEASURES OF THE GROUND UPHEAVAL DEFORMATION OF HANCHENG POWER PLANT[J].Earth Science Frontiers,2001,8(2):285-295. |
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| Authors: | ZHANG Zhuo-yuan LIU Han-chao |
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| Abstract: | Up to now, there has been continuously ground upheaving deformation in Hancheng power plant for 20 years. Since the early 1980s engineering controlling measures have been carried out two times successively. The first one was based on the understanding that the deformation mechanism was the frontal part upheaval of a landslide. To stabilize the considered landslide, a series of passive anti\|sliding piles were constructed. But monitoring for two years after the treatment revealed that the deformation did not stop at all. Moreover, the displacement velocity increased abruptly to twice as much as that before the treatment for two times. In 1995 and 1996, the second engineering control measure leading by dewatering was executed. In the meantime, aimed to find out the real mechanism of the upheaving deformation, a series of research, such as geological investigation, geomechanical modeling test and numerical simulation by DEM were conducted. Thus new knowledge of the deformation mechanism was obtained, and it may be stated as follows. After the collapse of the main roof of the large dimensional extraction cavity, the overlying strata of the collapse zone behaves as a composite beam under high loading. Subsidence and flexure of the beam accompanied with multiple inter\|stratal shearing, detachment and dilatancy of the rock mass, and lateral thrust force or lateral thrusting effect was thus generated. Under the lateral thrust force, the thin bedded sandstone underlying the ground of the power plant bended upward gradually. Evidently, the deformation is a kind of time\|dependent deformation caused by underground mining. Rising of pore water pressure induced by some man\|made factors intensifies the deformation. After the execution of dewatering measure, the deforming velocity has been reduced to the historical lowest level, and it is sustainable by the buildings and construction works of the plant. |
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| Keywords: | underground mining pore shearing detachment dilatancy lateral thrusting effect upheaval pore water pressure effect time-dependent deformation |
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