共查询到20条相似文献，搜索用时 68 毫秒
1.
谭显波 《石家庄铁路职业技术学院学报》2021,(1):27-31,56
针对黔张常铁路大坡隧道工程断面大、掘进困难等问题,采用了光面爆破施工技术,为使爆破效果能够满足设计要求,对爆破参数、装药量及炮眼数量进行了理论计算,并在现场进行试验验证,总结了隧道光面爆破技术的关键施工工艺,该项技术成果可为类似工程施工提供经验借鉴,具有较高的工程应用价值. 相似文献
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根据公路隧道“新奥法”施工的需要，通过光面爆破试验，得出各种围岩的科学合理的光面爆破设计参数，形成了公路隧道开挖的光面爆破方案，提出了光面爆破的施工工序。控制欠超挖，确保初期支护和二衬厚度，降低工程成本，取得良好的效果。 相似文献
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将军山隧道光面爆破技术与参数的选择 总被引：1，自引：0，他引：1
应用正台阶法开挖方法和微差、光面爆破技术,对将军山隧道掘进施工,通过合理选择爆破参数,减少了爆破对围岩的扰动,提高了隧道围岩的稳定性,控制了超欠挖量,加快了掘进速度,取得了理想的爆破效果。 相似文献
4.
孙琦 《石家庄铁路工程职业技术学院学报》2007,(4)
新奥法施工是隧道工程的先进施工技术。简要介绍新奥法的发展过程和基本原理,从锚喷支护、监控量测、光面爆破和科学组织四个方面对新奥法施工要点进行探讨。 相似文献
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公路隧道新奥法施工技术探讨 总被引：2，自引：0，他引：2
孙琦 《石家庄铁路职业技术学院学报》2007,6(4):56-59
新奥法施工是隧道工程的先进施工技术。简要介绍新奥法的发展过程和基本原理，从锚喷支护、监控量测、光面爆破和科学组织四个方面对新奥法施工要点进行探讨。 相似文献
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《石家庄铁路职业技术学院学报》2018,(4)
结合深埋软岩隧道的光面爆破参数设计,通过计算分析周边眼间距理论值,得出了现场周边眼间距的适宜值,从而达到了以追求光面爆破理想效果实现现场施工安全质量经济最佳配合。 相似文献
7.
马旺军 《杨凌职业技术学院学报》2014,(1):29-32
针对福安市湾坞供水工程隧洞爆破开挖长巷小断面、水工隧洞实施光面爆破开挖施工技术进行了讨论,从光面爆破施工方案、施工方法、质量保证、质量问题分析及处理、通风排水等方面做了介绍。 相似文献
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对昌宁高速隧道的设计施工以及光面爆破在掘进施工中的应用进行研究,在Ⅳ级围岩中使用正台阶光面爆破方法开挖断面安全可靠,通过光面爆破施工断面围岩稳定,扰动较小,保持原有的力学性质,光面爆破后的岩石表面按设计轮廓线成型,表面较平顺,超欠挖较少,掘进断面半孔率超过90%,施工进度及施工安全得到保障。 相似文献
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自预裂（光面）爆破在我国采用以来,其钻孔工作量大和对保留岩体危害大成为制约该项技术发展的瓶颈。上世纪80年代末,科技工作者就不断尝试聚能预裂（光面）爆破试验研究以突破预裂（光面）爆破发展的瓶颈。但或因技术及工艺水平不佳而无法用于工程实践,或因结构复杂、价格高昂而难以在工程中推广应用,迄今为止也尚未发现聚能预裂（光面）爆破较为系统的权威理论研究成果。 相似文献
10.
章春宁 《黎明职业大学学报》2013,(1):84-88
根据勐野江水电站隧洞围岩岩体类别差异性大的特殊地质条件,采用工程类比和现场试验法,研究复杂地质条件下隧洞光面爆破的爆破参数、炮孔布置、装药结构、起爆网路、施工方案及处理措施.研究结果表明,在复杂地质条件下进行洞室开挖,只要选择正确的爆破参数和合理的施工方法也可以取得良好的爆破效果. 相似文献
11.
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
12.
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
13.
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
14.
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
18.
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
19.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献