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1.
刘万辉 《甘肃科技》2009,25(12):125-126
结合工程实例,通过水泥土搅拌桩在变电地基处理工程中的实际应用,介绍了水泥土搅拌桩喷粉法和喷浆法的设计与施工,满足了工程安全、实用、经济的实际要求。其次对水泥土搅拌桩的优点作了简要的总结,提出了合理化的建议。  相似文献   

2.
水泥土搅拌桩目前已被广泛地应用于加固软弱地基。文章结合水泥土搅拌桩在实际工程应用的实例,对水泥土搅拌桩复合地基的设计、静载试验、沉降进行了初步的分析探讨,总结出水泥土搅拌桩的一些特点,以供施工参考。  相似文献   

3.
文章对加筋水泥土梁进行了纯弯加载试验,根据试验梁受弯承载过程及特点,将试验梁受弯破坏过程分成3个阶段;得出粘结滑移破坏是加筋水泥土支护结构承载力及刚度下降主要原因的结论;根据试验结果,探讨了加筋水泥土支护结构极限受力破坏机理;推导了抗弯承载力计算公式和刚度计算公式.提出的分析方法和计算公式对工程应用有一定的指导价值.  相似文献   

4.
纪成如 《工程与建设》2007,21(6):937-938
作为在深层搅拌水泥技术上的扩展应用,深层搅拌水泥土挡墙作为深基开挖的土壁支护和阻水手段近年来获得较多的应用.文章结合工程实例,从方案论证、设计计算、施工方法、施工效果等方面进行分析探讨,总结出水泥土挡墙的一些特点,以供参考.  相似文献   

5.
邓大鹏 《甘肃科技》2004,20(1):105-106
讨论了水泥土桩复合地基的设计原则,设计方法及复合地基的沉降计算。通过一个工程实例介绍了水泥土桩复合地基应用于建筑地基处理的情况。水泥土桩复合地基的应用,目前仍处于半理论半经验状态,将其应用于建筑地基处理。试验和测试工作仍十分重要。  相似文献   

6.
通过工程实例,介绍某高层建筑地下室基坑采用钻孔灌注桩和水泥土支护墙两种支护结构的设计方法,并提出在基坑支护结构设计过程中的一些看法,实例证明设计是可行的。  相似文献   

7.
介绍了太原市房地大厦动力站基坑开挖采用粉喷桩作支护结构工程的实例,重点阐述了水泥土挡墙的设计计算要点。粉喷桩作为支护止水结构,既满足了工程需要,缩短了工期,又带来了可观的经济效益。  相似文献   

8.
粟凯 《甘肃科技纵横》2005,34(1):111-112,182
本文介绍水泥土地下连续墙施工新技术、新设备和水泥土地下连续墙在土木工程中应用的前景。针对水泥土地下连续墙的连接等技术构造难题,提出了相应的的处理方法。  相似文献   

9.
本文提出了水泥土搅拌桩复合地基的承载力计算方法,根据复合地基理论,探讨了水泥土搅拌桩复合地基在软基处理中的应用的技术关键问题,并采用正三角形的布点方式,进行了工程实践,提出了水泥土搅拌桩的设计计算方法  相似文献   

10.
水泥土搅拌桩搅拌均匀性的电阻率评价方法   总被引:1,自引:0,他引:1  
采用电阻率测试方法,以常规水泥土搅拌桩和双向水泥土搅拌桩为例,对水泥土搅拌桩芯样电阻率进行测试.通过对其电阻率及其表征水泥土微观结构的结构因子、形状因子和各向异性指数的定量分析,阐述了水泥土搅拌桩在水平方向和沿桩身方向的均匀性;通过与搅拌桩桩身标贯击数和无侧限抗压强度等宏观力学指标对比,验证了利用电阻指标评价水泥土搅拌桩搅拌均匀性的科学性与可行性.结论表明:常规水泥土搅拌桩搅拌不够均匀,桩身水泥土的微观结构、物理力学性质随深度增加变差,表现出方向上的差异性.双向水泥土搅拌桩搅拌均匀,桩身水泥土的微观结构、物理力学性质沿桩身分布均匀.取芯和标贯试验论证了上述结果.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

16.
以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.  相似文献   

17.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

18.
Quality traits in wheat (Triticum aestirum L.) were studied by quantitative trait locus (QTL) analysis in a recombinant inbred line (RIL) population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross (ChSh). Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.  相似文献   

19.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

20.
赵英华 《科技信息》2008,(12):219-220
0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation's behavior in their social life throughout the long history is beyond list.  相似文献   

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