全文获取类型
收费全文 | 1047篇 |
免费 | 140篇 |
国内免费 | 112篇 |
专业分类
电工技术 | 9篇 |
综合类 | 152篇 |
化学工业 | 18篇 |
金属工艺 | 2篇 |
机械仪表 | 4篇 |
建筑科学 | 582篇 |
矿业工程 | 54篇 |
能源动力 | 26篇 |
轻工业 | 7篇 |
水利工程 | 390篇 |
石油天然气 | 3篇 |
一般工业技术 | 24篇 |
冶金工业 | 23篇 |
自动化技术 | 5篇 |
出版年
2024年 | 3篇 |
2023年 | 7篇 |
2022年 | 26篇 |
2021年 | 32篇 |
2020年 | 32篇 |
2019年 | 28篇 |
2018年 | 21篇 |
2017年 | 37篇 |
2016年 | 37篇 |
2015年 | 44篇 |
2014年 | 90篇 |
2013年 | 40篇 |
2012年 | 78篇 |
2011年 | 94篇 |
2010年 | 78篇 |
2009年 | 89篇 |
2008年 | 89篇 |
2007年 | 79篇 |
2006年 | 76篇 |
2005年 | 66篇 |
2004年 | 63篇 |
2003年 | 43篇 |
2002年 | 36篇 |
2001年 | 25篇 |
2000年 | 18篇 |
1999年 | 12篇 |
1998年 | 13篇 |
1997年 | 15篇 |
1996年 | 10篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1979年 | 2篇 |
排序方式: 共有1299条查询结果,搜索用时 15 毫秒
81.
路堤荷载下土工织物散体桩复合地基离心模型试验 总被引:1,自引:0,他引:1
进行了2组不同筋材刚度土工织物散体桩复合地基路堤离心模型试验,和1组碎石桩复合地基路堤的对比试验,以研究其在真实应力条件下的性状及稳定性。研究结果表明:随着筋材刚度的增大,地基中的超孔隙水压力略有减小,桩顶和桩间土沉降明显减小,而桩顶和桩间土之间的差异沉降明显增大;桩土应力比随筋材刚度的增大先增长明显,而后趋于缓慢;当筋材刚度较低或上覆荷载很大时,土工织物散体桩可发生显著的弯曲变形而引起较大的沉降,碎石桩则在软土中容易发生鼓胀变形而引起很大的沉降,但两者均未在复合地基中形成剪切滑移的趋势。 相似文献
82.
Kenji Watanabe Susumu Nakajima Torajiro Fujiwara Kyoichiro Yoshii G. Venkatappa Rao 《Soils and Foundations》2021,61(1):218-238
The railway embankment applied to high-speed railways is required to have high performance in terms of strength and deformation characteristics. Especially in the case of railway embankments that support slab tracks, the allowable settlement is very small. There are two technical challenges in constructing high-speed rail embankments to support slab tracks in India. The first challenge is dealing with problematic black cotton soil (BCS), which is widely distributed in India but very unusual soil in Japan. The second challenge is posed by the strict deformation requirement in the construction of the embankments. In this study, a 6 m-high test embankment was constructed on BCS in India. The deformation of the embankment and changes in water content were measured over a period of 18 months. In the construction of the test embankment, two different BCS countermeasures were applied. The results of the tests on this embankment were compared with those from an embankment without countermeasures. Complicated deformation behaviors, including settlement and the uplift of embankment, were observed in the section without countermeasure. However, in the embankment with cement-mixed gravelly soil (CGS) slab improvement with geosynthetics, the much lower amplitude of embankment deformation is evidence of the effectiveness of this countermeasure. The cohesive non-swelling soil (CNS) layer applied immediately below the embankment to reduce the water content fluctuation of BCS was not effective enough for use for high-speed railway embankment. Besides determining the technical challenges for the BCS countermeasures, the results of this study confirmed that a high-performance embankment can be constructed with Indian embankment material by performing sufficient compaction management. 相似文献
83.
《Soils and Foundations》2021,61(5):1287-1301
Steel slag-treated marine clay (SSTC) is a novel geomaterial used for recycling steel slag. This article reports the effects of the primary curing (the time delay between mixing and fill work) and the subsequent disturbances (the processes of remolding, handling, and placement) on the strength development of the geomaterial. The results of a series of experiments point to the possibility of improving the initial strength of SSTC for maritime fill work. Laboratory tests were performed to investigate the changes in and the recovery of the geomaterial strength brought about by one to three days of primary curing and the subsequent disturbances during various secondary curing times. In the field tests, three embankments, using SSTC that had previously undergone one or two days of primary curing, were constructed in seawater with an actual construction machine. The test results indicated that the initial strength of SSTC previously treated with one, two, or three days of primary curing increased to approximately 14 kN/m2. The loss in strength that occurred at the primary stage of curing was recovered at a later stage of curing, namely, after 28 days, and the strength of the SSTC in the three embankments was 52–70% of the sample that was cured without primary disturbance. Larger amounts of disturbances were applied to the SSTC in the field tests than in the laboratory tests. The field tests produced submerged embankments, 1.8 m in height, with average slopes of 1:2.1–1:2.9, by undergoing one to two days of primary curing. The strength of the SSTC in all the embankments recovered significantly with time after construction, and the unconfined compressive strength of the SSTC exceeded 200 kN/m2 at 100 days, which is deemed sufficient for the construction of embankments. Overall, it was confirmed that the one-day primary curing and the sea-bottom fill method presented better results than the two-day primary curing and the sea-surface fill method, considering the gradient of the slope and the strength-recovery characteristics of the SSTC. 相似文献
84.
软土地基上堤防工程的工后沉降预测和控制不仅受理论计算方法的制约,在某些情况下,工程全周期管理更是主要影响因素。本文结合多个海堤工程的原位观测数据与理论计算,充分考虑实际的施工条件,对堤防工程全线的工后沉降进行分析。 相似文献
85.
大型疏浚土充填袋筑堤技术研究 总被引:1,自引:0,他引:1
为缓解砂石资源紧缺、保护生态环境、降低工程造价和高效利用航道疏浚土,以大型疏浚土充填袋筑堤技术应用于连云港港徐圩港区围堤建设为工程实例,通过稳定性分析计算、离心模型试验开展了大型疏浚土充填袋筑堤技术的理论可行性研究,并结合原型试验提出了新型配套施工工艺,形成了相关成套技术。研究表明:袋体土工织物加筋作用良好,堤体及地基稳定性能够满足安全设计;控制疏浚土充填料初始含水率、采用泥浆泵与浓浆泵串联接力的施工工艺,能够提升大型疏浚土充填袋筑堤施工效率,满足正常围堤建设强度需要;低含水率疏浚土充填料排水较快、袋体实际有效厚度较为理想、堤体地基较为稳定,大型疏浚土充填袋筑堤具有其技术可行性。 相似文献
86.
87.
88.
89.
山区公路类土质深路堑高边坡处治 总被引:1,自引:0,他引:1
结合福建东部沿海山区高速公路类土质深路堑高边坡特点,分别介绍了类土质深挖路堑高边坡的处治办法,对工程实践中出现的滑坡现象进行了分析,论述了设计施工中注意的重要方面,对今后相关深路堑高边坡设计与施工有一定的借鉴意义。 相似文献
90.
高速公路改扩建拓宽结合部处治方法 总被引:1,自引:0,他引:1
针对高速公路改扩建路基拓宽结合部的常见病害,深入分析其病害的成因——差异沉降,从填筑材料的固结本质、材料选取与施工工艺、拓宽结构设计方面探索了差异沉降机理,并提出了相应的处治方法,为公路改扩建工程提供了指导。 相似文献