First report of eclogites from central Tibet,China: evidence for ultradeep continental subduction prior to the Cenozoic India‐Asian collision     

Kai‐Jun Zhang  Yu‐Xiu Zhang  Xian‐Chun Tang  Yao‐Wu Xie  Shao‐Li Sha  Xing‐Jie Peng 《地学学报》2008,20(4):302-308

Eclogites characterized by a garnet + clinopyroxene + orthopyroxene + sanidine + rutile assemblage are reported for the first time in the eastern Bangong suture, central Tibet (China). Garnet and sanidine are exsolved from clinopyroxene. Al‐exchange barometer for orthopyroxene and garnet and K concentrations in clinopyroxene indicate a peak pressure of ～4 GPa. The occurrence of these ultrahigh‐pressure rocks implies the subduction of continental crust to a depth of >130 km along the eastern Bangong suture zone during the Early Jurassic. The denudation of these ultrahigh‐pressure metamorphic rocks could have provided a significant source for the Jurassic turbidites in the western Bangong ocean basin.  相似文献   

Efficiency and Accuracy Verification of the Explicit Numerical Manifold Method for Dynamic Problems     

X. L. Qu  Y. Wang  G. Y. Fu  G. W. Ma 《Rock Mechanics and Rock Engineering》2015,48(3):1131-1142

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Flat-plate roof collapse of shallow caverns and protective measures: a case study of Longyou ancient siltstone caverns     

Zhongjian Zhang  Lihui Li  Wenjie Xu  Yan Fu  Jun Feng 《Natural Hazards》2015,76(1):191-213

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基于MicroStation环境的图形编辑系统的开发   总被引：4，自引：0，他引：4  

付子傲  蓝荣钦  李小曼 《测绘学院学报》1999,(1)

研究了利用MicroStation95开发图形编辑系统、定制用户界面和自动建立地形图符号库的方法和技术。介绍了具体操作中的一些经验和技巧。  相似文献   

Comparative study on the “optic-electric” monitoring method for the deformation and failure of surrounding rock in stopes     

Sun  Binyang  Zhang  Pingsong  Fu  Maoru 《Natural Hazards》2022,110(1):407-427

Natural Hazards - The evolution law for the mining-induced deformation and failure of surrounding rock is an important parameter for coal mine work safety. Accurate detection is a scientific matter...  相似文献   

A simulation study on risks of pedestrian evacuation from flooded staircases of different slopes in the underground space     

Hou  Jingming  Chen  Guangzhao  Zhang  Yangwei  Li  Bingyao  Yang  Shaoxiong  Tong  Yu  Zhang  Dawei  Fu  Deyu 《Natural Hazards》2022,110(1):519-543

Natural Hazards - To quantitatively assess the risks of pedestrian evacuation through staircases with different slopes when a flood intrudes into the underground space, a numerical model was...  相似文献   

Failure Mechanism and Control of Surrounding Rock of Mining Roadway Under Overlying Goaf     

Yang  Jiyuan  Dong  Junliang  Lv  Kun  Bi  Zhongwei  Fu  Xingyu  Zhao  Bin 《Geotechnical and Geological Engineering》2022,40(3):1607-1618

Geotechnical and Geological Engineering - Aiming at the deformation and failure of roadway surrounding rock and its control problems under goaf in upper and lower coal seam mining of Buertai Coal...  相似文献   

Reliability Analysis of Reinforced Slope Combining Random Forest Algorithm and Meshless SPH Algorithm     

Liu  Xu  Li  Liang  Wang  ShangShang  Chen  Fu  Zhai  Ming  Yang  Zhengquan  Gao  Yuan 《Geotechnical and Geological Engineering》2022,40(3):1075-1089

Geotechnical and Geological Engineering - This paper presents a framework combining a mesh-free method called Smoothed Particle Hydrodynamics (SPH) algorithm with Random Forest (RF) algorithm to...  相似文献   

泸州区块深层页岩裂缝脉体发育特征及成脉流体活动          下载免费PDF全文

姚程鹏  伏海蛟  马英哲  严德天  汪虎  李跃国  王佳伟 《地球科学》2022,47(5):1684-1693

裂缝脉体中蕴藏着天然裂缝演化与古流体充注活动等重要信息,对于深层页岩气保存条件也有指示意义.针对泸州区块龙马溪组深层页岩裂缝脉体,综合运用光学薄片、阴极发光、流体包裹体及微区原位等分析手段,分析了裂缝脉体的发育特征,研究了成脉流体活动及其成岩环境演化,探讨了页岩气保存条件.研究发现,深层页岩裂缝脉体主要为石英与白云石或方解石组成的复合脉体,不同矿物之间表现出较复杂的切割关系,盐水包裹体与高密度甲烷包裹体大量发育,且裂缝脉体主要形成于还原性环境.整体看来,构造抬升背景下,深层页岩裂缝开始形成且处于不断开启或闭合过程,3期不同性质的古流体多次充注胶结,较封闭的成岩体系对深层页岩气的保存有利.   相似文献   

锚杆不确定性对加固边坡失稳概率的影响     

王上上  陈富  李东贤  林后来  刘志良  李亮 《地质科技情报》2022,41(2):282-289

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