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重力应
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  gravity stress
     Thus it is concluded that the secondary stress field produced by unloading is primary stress source inducing mine earthquakes and that unloaded gravity stress field plays a prominent role in inducing the seismogenic process.
     得出卸荷产生的次生应力场是孕育矿震的主要应力来源、卸荷重力应力场诱发作用突出的结论。
短句来源
  gravitational stress
     Compared to the cases under the gravitational stress field condition, the total yielding zone will be grtly reduced because of the increase of horizontal confining stress with depth.
     与在重力应力场下的分析结果互相比较,当水平应力随着深度增加以后,在分段回采巷道附近的屈服破坏带将会大大变小。
短句来源
     The results show that the ground stresses at Qinling extra long tunnel district have been expressed in some specialities mainly by the gravitational stress field.
     结果表明,秦岭特长隧道地区地应力表现了以重力应力场为主的某些特征。
短句来源
     With the helpof quantitative observation of relativity between mining activity and mining earthquake,analysis is carried out on theinduced factors of mining earthquake. The study points on that the mechanism being of geological structural environ-ment,the stress field and mining activity worked together to induce mining earthquake,and that local stress field playan important role in seismogenic process,that discharged gravitational stress field or coupling of high pressure gasexpand is primary,when induced the mining earthquakes.
     通过定量观察采矿与矿震活动的相关性,分析强矿震的直接诱发原因.提出地质构造环境、地应力场和采矿活动共同作用诱发强矿震的机理和局部应力场在孕育该震过程起主导作用、卸荷重力应力场抑或耦合了高压瓦斯的膨胀起主要诱发作用的观点;
短句来源
  相似匹配句对
     Chen should be D.
     Chen 为D.
短句来源
     Ktze should be C.
     Ktze 为C.
短句来源
     Several problems should be noticed during designing gravity type sinking-well
     重力式沉井设计中注意的几个问题
短句来源
     Gravity valveless filter has been widely used in the practice.
     重力式无阀滤池广泛用于生产中。
短句来源
     GRAVITY TIDE CORRECTIONS
     重力潮汐改正
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  gravitational stress
Cerebral autoregulation is compromised during simulated fluctuations in gravitational stress
      
However, in conditions such as those encountered on board a high-performance aircraft, the gravitational stress is constantly changing and might compromise cerebral autoregulation.
      
These results show that the ability of the cerebral vessels to modulate fluctuations in blood pressure is compromised during oscillatory compared with constant gravitational stress.
      
We propose that this deviation results from the gravitational stress field of the overlapping volcanic edifices, reinforced by volcano spreading on weak substratum.
      
Above the oceanic basement, gravitational stress and volcano spreading adjusted the principal stress axes' orientations causing counterclockwise dike rotation of up to 40°.
      
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Ground control problems in subievel caving become evident as the rock pressure increases with depth. Recently, a finite element analysis of the stability problems of the sublevel caving method was completed by the authors. This paper summarizes the results of stress analysis in sublevel extraction drifts under different stress field conditions by using linear elastic and nonlinear elasto-plastic finite element modeling techniques. A critical stress concentration will occur in the uppermost sublevel drifts beneath...

Ground control problems in subievel caving become evident as the rock pressure increases with depth. Recently, a finite element analysis of the stability problems of the sublevel caving method was completed by the authors. This paper summarizes the results of stress analysis in sublevel extraction drifts under different stress field conditions by using linear elastic and nonlinear elasto-plastic finite element modeling techniques. A critical stress concentration will occur in the uppermost sublevel drifts beneath the caved area or blasted ore area. During the blasting and drawing cycle, a tensile and shear failure condition could develop in the central extraction drift when it would be mined last. Under a high horizontal stress field condition, almost all tensile stress in the back of the extraction drifts will be eliminated and only slight yield can be seen in the floor of the extraction drifts. Compared to the cases under the gravitational stress field condition, the total yielding zone will be grtly reduced because of the increase of horizontal confining stress with depth. However, it is predicted that the centre of each ore column side will experience excessive shear stress that probably will result in ore failure.The two major conclusions drawn from this study to improve the overall stability of sublevel caving are: (1) the width of extraction drifts must be carefully controlled and an appropriate stoping sequence selected; and (2) the sublevel caving method can be used in deep mining if the pillar width is increased correspondingly with mining depth.

本文归纳了用线弹性和非线性的弹-塑性有限元法对于在不同应力场条件下的分段回采巷道的应力分析的结果。从分析中发现,在废石已崩落的分段水平或崩矿的分段水平下面的分段回采巷道将出现临界应力集中。在爆破和放矿的循环中,如果中央回采巷道开采滞后时,将在该进路巷道出现拉伸和剪切破坏。在水平应力场条件下,回采巷道顶板的所有拉伸破坏都不再出现,只有在回采巷道底板上将出现轻微的屈服。与在重力应力场下的分析结果互相比较,当水平应力随着深度增加以后,在分段回采巷道附近的屈服破坏带将会大大变小。然而,预料将有另一种破坏出现,这就是在矿石柱体的测面的中部可能出现过分大的剪应力而导致的剪切破坏。从分段崩落法稳定性的研究中,可以得出两个主要结论:(1)回采巷道的宽度必须仔细地控制在一定的范围内,并且要选择好恰当地回采顺序;(2)分段崩落法可以用于开采深部矿体,如果将矿柱宽度随开采深度而作相应的增加的话。

The measurements of ground stresses by using the hydraulic cracking method within the deep boreholes were proceeded at the Qinling extra long tunnel district. Based on the practical measuring results, and combined with the geological circumstances at the measuring points, the paper makes the discussions on the following important aspects: the influences of topographic geomorphology on the measuring results, the concentration of stresses, the ground stresses at the deep portions, etc. The results show that...

The measurements of ground stresses by using the hydraulic cracking method within the deep boreholes were proceeded at the Qinling extra long tunnel district. Based on the practical measuring results, and combined with the geological circumstances at the measuring points, the paper makes the discussions on the following important aspects: the influences of topographic geomorphology on the measuring results, the concentration of stresses, the ground stresses at the deep portions, etc. The results show that the ground stresses at Qinling extra long tunnel district have been expressed in some specialities mainly by the gravitational stress field. Finally, combined with the engineering practices, the paper discusses the problems concerned with the axial selection of the tunnel,the rock burst during construction, etc.

秦岭特长隧道地区采用水压致裂法进行了深钻孔的应力测量。本文在实测成果基础上,结合测点所处地质环境,从地形地貌对测量成果的影响、应力集中和深部地应力等几个重要方面进行了探讨。结果表明,秦岭特长隧道地区地应力表现了以重力应力场为主的某些特征。文章最后,结合工程实际,对隧道轴向的选择和施工中的岩爆问题进行了探讨。

Based on field observation of high density digital seismograph and tidal deformation network of meso-scaleseismological experimental site,two strong mining earthquakes in Laohutai coal mine were monitored continuously.The data of strong mining earthquake process is analyzed by seismological methods and wavelet tools,anomalous in-formation on strong mining earthquake is extracted in the short-term and impending stages.By means of focal mecha-nism solution of regional strong earthquake,focal mechanism solution...

Based on field observation of high density digital seismograph and tidal deformation network of meso-scaleseismological experimental site,two strong mining earthquakes in Laohutai coal mine were monitored continuously.The data of strong mining earthquake process is analyzed by seismological methods and wavelet tools,anomalous in-formation on strong mining earthquake is extracted in the short-term and impending stages.By means of focal mecha-nism solution of regional strong earthquake,focal mechanism solution of strong mining earthquake,focus investiga-tion at the nearest field,focus location of high precision,site absolute stress measurement and 3D finite difference nu-merical test,the seismogenic conditions and focal mechanism of strong mining earthquake are analyzed.With the helpof quantitative observation of relativity between mining activity and mining earthquake,analysis is carried out on theinduced factors of mining earthquake.The study points on that the mechanism being of geological structural environ-ment,the stress field and mining activity worked together to induce mining earthquake,and that local stress field playan important role in seismogenic process,that discharged gravitational stress field or coupling of high pressure gasexpand is primary,when induced the mining earthquakes.The consanguineous relativity between mining-inducedearthquakes and gas are found in deep mining,a new kind of mining-induced earthquake induced by coupling of exploi-tation discharge and high pressure gas expand maybe exist.Believable b value,η value,frequency and V_p/V_s ratioseismological anomalies and fixed point tidal deformation anomalies have been extraeted before strong mining earth-quake in the short-term and impending stages.Extraction methods of anomalous information and forecast of strongmining earthquake in the short-term and impending stages are discussed.

基于中尺度地震实验场高密度数字地震和前兆台网对抚顺老虎台矿两次强矿震进行连续的现场观测,用地震学方法和小波工具分析强矿震孕震过程采集到的数据,提取短临阶段的异常信息;用区域强震震源机制解、强矿震的震源机制解、极近场震源调查、震源高精度定位、现场绝对地应力测量、三维有限差分数值试验方法,分析强矿震的孕震应力场环境和震源机制;通过定量观察采矿与矿震活动的相关性,分析强矿震的直接诱发原因.提出地质构造环境、地应力场和采矿活动共同作用诱发强矿震的机理和局部应力场在孕育该震过程起主导作用、卸荷重力应力场抑或耦合了高压瓦斯的膨胀起主要诱发作用的观点;发现煤炭深部开采条件下,矿震和瓦斯存在密切的相关性,有可能存在一种开采卸荷和高压瓦斯气体膨胀耦合作用诱发的新型矿震——卸胀耦合型矿震;提取到震前短临阶段存在的b6值、η值、频次、波速比等可信的地震学异常和定点潮汐形变前兆异常,对异常信息的提取方法和强矿震短临阶段的预测进行了探讨.

 
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