共查询到20条相似文献,搜索用时 46 毫秒
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为了进行西部采煤沉陷区地表生态恢复治理,针对采动引起的地表永久性地裂缝的治理,在进行超高水材料物理力学性能测试的基础上,研制了野外超高水材料地裂缝充填工艺及充填系统,提出了“深部充填-表层覆土-植被绿化”的地裂缝治理3步法,并以神东矿区大柳塔煤矿12203~12205工作面老采空区生态治理示范基地为试验区,进行了超高水材料地裂缝治理试验,通过与常规沙土充填方法对比分析发现,该系统采用水体积为94%的超高水材料进行地裂缝深部充填后,地表下沉量大大减小,且地表保水性能大大提高,植被长势良好。 相似文献
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在地铁旁通道人工冻土解冻后,冻土体的融化沉降量不仅和土体性质、含水量有关,更受到周围土压力的影响,产生较大的压缩沉降,进而引起地表的沉降。结合随机介质理论方法和前苏联一维融土层沉降公式,建立了能够同时反映土体压力和融沉系数对地表沉降量影响的计算模型。结合某旁通道冻结工程,预测分析了无注浆条件下地表的沉降量。计算结果表明:对于旁通道冻结工程,土体解冻后的融沉量要小于土体压力产生的压缩变形量,其中压缩变形量约占总变形量的72%~87%。并且在土体埋深的增加或者地表有附加荷载的条件下,压缩变量所占比重将更大。 相似文献
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Zhen-hua Ouyang 《煤炭学报(英文版)》2010,16(3):240-245
Based on five basic assumptions, using theoretical analysis method, the nature of the ground subsidence and collapse was revealed
from the mechanics point. Divided into four phases as groundwater level descent, soil cavity formation, soil cavity expansion,
and ground collapse emersion, the whole process of ground subsidence and collapse was analyzed in detail. The study shows
that ground subsidence and collapse is the macroscopic performance and inevitable result of the soil cavity expansion and
development, and the dynamic mechanics is the spalling force induced by the groundwater falling. The activities of underground
water play a very important role in the process from the formation of soil cavity to the production of ground subsidence. 相似文献
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Kerim Kucuk 《Journal of Mining Science》2011,47(1):47-54
The studies done about shallow tunnels have been going on extensively. In the shallow tunnels especially driven in population
dense areas, soil-rock problems are encountered as well as ground water. Although ground water is the most common problem,
it does not take place so much in literature. During tunneling, the drainage of the groundwater is the most important point
that should be considered. In some cases, the drainage of ground water through the tunnel cause ground settlements in the
surrounding buildings. This problem particularly seen in weak soil/rock formations could be turned into a handicap by the
surface injection applications. Sometimes, injection application to prevent settlement problem and to reinforce the ground
creates risky conditions such as face burst, roof collapse during tunneling. This problematic situation risks both the work
safety and the environmental safety. This study investigates retrospectively the collapse of the tunnel roof and faces burst
during the construction of Izmir Metro 2nd phase. Eventually, in the zone where ground water regime exists and very weak formation
is present, injection study did not seem to serve the purpose. 相似文献
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为研究SMW工法型钢起拔过程中不同因素对周边土体变形的影响,基于南京某电缆隧道工程SMW工法型钢起拔工程实例,对拔除型钢后的基坑周边土体变形进行了监测,采用ABAQUS有限元软件进行数值模拟,将地表沉降及深层水平位移监测数据与模拟结果进行对比,验证了数值模拟的合理性,对不同弹性模量以及拔桩顺序下周边的地表沉降规律进行了分析。研究结果表明:水泥土弹性模量不超过600 MPa时,水泥土弹性模量每增加100 MPa,地表平均累计沉降相应的会减小,减小幅度在16.2%~19.5%,增加弹性模量能有效减少距钢板桩6 m内的地表沉降;不同的拔桩顺序形成的地表沉降差值不超过0.65 mm。 相似文献
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针对内蒙古西部矿区表土段流砂层的赋存情况以往实际施工情况,分析了斜井沉井法的特点,并通过五个斜井沉井施工实践总结,认为斜井沉井法过流砂层是一种简单、安全、经济合理的有效施工方法,提出了部分施工设计参数可供参考。 相似文献
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回采速度对地表动态移动变形值的影响 总被引:1,自引:0,他引:1
以Knothe模型的函数为基础,对不同推进速度下动态地表移动和变形进行了研究,结果证明,提高开采速度有利于减小地表采动损害。 相似文献
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John W. Kopp 《国际露天开采、回填与环境杂志》2013,27(3):167-172
ABSTRACT A major concern with blasting at surface mines is generation of ground vibrations and airb1ast and their effects on nearby residences. This Bureau of Mines report looks at the use of millisecond delays in blast design and their effect on the resulting ground vibrations and airb1ast. A total of 52 production blasts were instrumented and monitored at a surface coal mine in southern Indiana. Arrays of seismographs were used to gather time histories of vibrations and airblast. The data were analyzed for peak values of vibration and airblast and for frequency content. Various delay intervals were used within and between rows of b1astho1es.De1ay interva1s within rows were 17 and 42 ms, and those between rows ranged from 30 to 100 ms; these interva1s are equivaIent to 0.5 and 1.3 ms/ft within rows and 1.2 to 4.3 ms/ft between rows. Subsonic delay interva1s with in rows reduced airb1ast by 6 dB. Large delay interva1s between rows reduced the amp1itude of ground vibrations; their frequency depended primarily upon the geology of the mine site. 相似文献
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将某些地下水分类为“直接受地表水影响的地下水”类型 ,以便按地表水处理规程进行处理。本文给出了一种鉴别上述类型地下水的改进方法。并列举了若干实例来说明所推荐方法的应用。 相似文献
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针对矿井开采时,井下空间在重力作用冲击下,极易产生缝隙形成地面塌陷的问题,提出基于无人机遥感技术的矿井地面塌陷综合监测,全方位分析矿井地面沉陷特征。分析待监测矿区现状,运用外部空间数据收集和内部数据处理2个子系统构建无人机遥感系统,根据航高、分辨率、重合率、航线、数据处理等步骤明确地面塌陷程度和范围。通过实测分析得出,利用不同阶段无人机遥感数据记录,可精准掌握矿井地面塌陷及地面震荡规律,明确地表位移与侵蚀情况,所获塌陷值和地面实测塌陷值基本相同,有效证明了无人机辅助监测矿井地面塌陷的可靠性与实用性。 相似文献
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斜板浓密机浅层内单矿物泥浆沉降规律 总被引:2,自引:0,他引:2
研究了石英砂湿磨矿浆的实验室静态沉降和斜板单元动态沉降过程,揭示了两种沉降的内在规律,相互关系,差异及其机理,为斜板浓密机的应用试验及工程设计提供了相应的理论依据。 相似文献