共查询到20条相似文献，搜索用时 62 毫秒
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膨胀土是一种具有特殊工程性质的土,对铁路、公路的建设具有巨大的危害和影响.介绍了膨胀土的工程性质,论述了膨胀土边坡滑坡的原因及机理,提出了膨胀土边坡在施工过程中的注意事项和防治措施. 相似文献
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根据湖北省宜昌市小溪塔至鸦鹊岭一级公路改建工程所在地广泛分布的膨胀土及风化砂,采用风化砂改良膨胀土用作路基填料,对掺入不同比例风化砂改良后的膨胀土进行膨胀性试验及力学强度试验,在实验室中验证了风化砂改良膨胀土作路基填料的可行性。在此基础上,剖析了风化砂改良膨胀土的原理,并与其他材料改良膨胀土的原理及性质进行比较,指出了其优越性所在。最后,介绍了风化砂改良膨胀土路基施工的工艺流程及施工过程中要控制的关键点,对施工后的路基进行了沉降观测,进一步证明了风化砂改良膨胀土路基的可行性,为同类工程施工提供参考依据。 相似文献
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牟宗娟 《石家庄铁路职业技术学院学报》2012,(2)
在微膨胀土隧道掘进施工时,由于膨胀土“遇水膨胀,失水收缩”特性,必须采取切实可行的施工方法和技术措施,才能保证膨胀土隧道支护质量在施工前期及变形后期能够满足设计要求.三道岭隧道微膨胀土掘进施工技术,通过对所开挖隧道的地质资料、现场试验结果及监测数据的详尽分析研究,采取极具针对性的技术措施,较好地避免了隧道初期支护施工后通常出现的开裂、收敛,导坑下沉等变形现象,隧道支护及早封闭成环保证支护整体受力,在很大程度上减少隧道的变形,较好地解决这一地区出现的微膨胀土隧道掘进施工的技术难题 相似文献
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吴鸿胜 《石家庄铁路工程职业技术学院学报》2007,(2)
膨胀土分布在我国广西、云南、湖北、河南、安徽、四川、河北、山东、陕西、江苏、贵州和广东等广大地区。随着我国铁路建设的高速发展,由膨胀土修筑的路基在交工运营之后,不同程度发生路基下沉、边坡沉塌、滑坡等病害。为保证膨胀土路基在较长时间内的稳定,达到安全、舒适行车的目的,解决因膨胀土而造成的一系列工程问题。通过对西安南京铁路南阳西站膨胀土路基施工的探索,提出对膨胀土路基病害成因浅析、治理措施及施工控制要点。 相似文献
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介绍了在安徽膨胀土地区路基施工中,由于膨胀土存在压实困难、裂隙发育、易风化、吸水膨胀降低强度等缺陷,为解决填料短缺,降低工程造价,提高路基强度和整体稳定性,采用在膨胀土中掺石灰,改善膨胀土的结构,达到提高路基填筑质量的目的。 相似文献
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用石灰处理膨胀土路基填料 总被引：1，自引：0，他引：1
卢海钧 《淮北职业技术学院学报》2007,6(3):88-89
膨胀土在低压时遇水会发生体积膨胀,失水时会发生体积收缩,对膨胀土路基进行处理是保证路基稳定工作的常用工程措施之一。本文介绍了膨胀土工程性质对公路工程的危害以及膨胀土的石灰处治方法,对不同石灰掺加剂量的实验结果进行了分析,并提出了石灰处理膨胀土的施工工艺及注意事项。 相似文献
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王元康 《石家庄铁路职业技术学院学报》2015,14(2)
结合实际工程中所遇到的膨胀土滑坡问题,分析导致高速公路膨胀土路堑边坡一次或多次发生坍塌的主要原因。由于原设计边坡过陡、施工前防截水措施不到位、施工过程中支护不及时所致。对该段膨胀土路堑滑坡治理进一步进行完善设计,调整施工工序及工艺,使滑坡问题得以解决,为工程的安全运营提供保障。 相似文献
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吴鸿胜 《石家庄铁路职业技术学院学报》2007,6(2):16-20
膨胀土分布在我国广西、云南、湖北、河南、安徽、四川、河北、山东、陕西、江苏、贵州和广东等广大地区。随着我国铁路建设的高速发展，由膨胀土修筑的路基在交工运营之后，不同程度发生路基下沉、边坡沉塌、滑坡等病害。为保证膨胀土路基在较长时间内的稳定，达到安全、舒适行车的目的，解决因膨胀土而造成的一系列工程问题。通过对西安南京铁路南阳西站膨胀土路基施工的探索，提出对膨胀土路基病害成因浅析、治理措施及施工控制要点。 相似文献
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孙志军 《邢台职业技术学院学报》2013,30(3):61-63
基于邢台市区膨胀土的主要性质,采用标准贯入试验进行了膨胀土承载力分析,并基于数据回归分析和工程经验,归结出了膨胀土承载力分析方法的适用范围。实践证明,在膨胀土承载力分析过程中,由于采用了将试验击数与载荷试验直接对比进行回归分析,具有相当的准确性和科学性。 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
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献