共查询到20条相似文献，搜索用时 62 毫秒
1.
黎一禾 《四川职业技术学院学报》2024,(1):156-160
日益增多的山岭隧道多处于复杂工程地质条件的地区,以我国西南地区尤甚.在山岭隧道的勘查和施工过程中,常伴随着岩体破碎、岩溶、岩爆、煤层瓦斯和采空区等特殊工程地质问题单独或者交错出现,带来严重安全隐患,耽误工程进度.超前地质预报是山岭隧道施工过程中有效避免此类工程地质问题不可或缺的重要手段之一.本文在简要论述了华蓥山隧道地质条件的基础上,采用地质雷达探测掌子面与开挖掌子面验证相结合的方式,对比分析了山岭隧道施工中超前地质预报技术的应用成效,并进一步提出相应的施工建议. 相似文献
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提前预知隧道施工前方的地质条件将为施工单位安排组织施工提供有力的保障,探地雷达在隧洞超前预报工作中的应用,具有方便、快速、分辨率高等优点。就目前超前预报中存在的问题,提出了一些解决办法。对探测方法作了一些改进,并对解释理论作了一些初步的研究,结合工程实例,通过实践验证了理论的可行性。 相似文献
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地质雷达勘探方法是应用于隧道掘进中的超前预报,具有快捷、准确的特点。针对如何有效地提高探测精度做了探讨和总结,对工程实例中典型的雷达图像进行分析和判断,并成功预报隧道掌子面前方地质状况,为保障隧道安全施工提供一定依据,也验证了地质雷达的实用性。 相似文献
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李向东 《石家庄铁路职业技术学院学报》2018,(1)
超前地质预报属于隧道施工过程中尤为重要的环节,能够有效保障隧道施工的安全性,并且防治灾害,实现隧道施工过程中的信息化。在隧道施工超前地质预报方法不断探索及开发的过程中具有不同的适用范围及条件,所以就要在隧道施工过程中进行相应的补充及验证,选择不同的超前预报方式,从而为隧道施工提供精准的地质预报数据,避免在隧道施工过程中出现人身和设备等一系列的安全事故。基于此,本文就对隧道施工超前地质预报进行研究,并且分析其发展趋势。 相似文献
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孙劲松 《小作家选刊(小学)》2011,(8):3-4
本文介绍了隧道施工超前地质预报的目的、内容及方法,探析了各种地质超前预报方法的机理及特点．分析了隧道施工超前地质预报的发展方向．以其为工程研究与应用提供借鉴。 相似文献
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基于地震反射波法超前预测系统的原理及主要技术手段,以栋梁坡隧道工程为实例,针对隧道复杂的地质条件,施工过程中将超前地质预报和地质素描调查相结合,先对隧道全段范围内地形、地层岩性等进行全面核查,然后结合核查结果运用地震反射波法预报掌子面前方的节理裂隙发育情况,围岩完整性等地质信息。开挖后验证情况与预测结果基本一致,为后续预防突水塌方等隧道地质灾害事故的发生提供数据支撑,有效保证栋梁坡隧道的施工安全。 相似文献
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《佳木斯教育学院学报》2017,(6)
在隧道施工中常会遇到各种不同的地质条件,如不能准确预测掌子面前方地质情况,将会给隧道施工带来诸多不便,甚至发生安全质量事故。本文结合云桂铁路某隧道超前地质预报中TSP技术的应用进行分析、总结,详细介绍了该技术的应用方法与结果,可为同类工程施工提供参考,进而提高我国铁路隧道施工的安全、质量与进度。 相似文献
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蒋庆举 《开封教育学院学报》2015,(4):279-280
由于我国岩溶分布相对广泛,而岩溶区域又会对隧道施工产生影响,所以探讨岩溶区隧道施工工艺关键技术就显得尤为重要。为避免岩溶区地质灾害的发生,需要从岩溶对隧道工程产生的危害入手,做好超前预报的组织与管理,制定合理的岩溶区隧道施工方案,提高岩溶隧道施工技术水平。 相似文献
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储洪正 《石家庄铁路职业技术学院学报》2005,4(Z1):86-88
结合渝遂高速公路梨树湾隧道工程,开展了超前地质预报、隧道变形与结构应力监测与试验,通过施工监测,控制隧道施工各工序,确保隧道施工质量和安全. 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献