共查询到19条相似文献,搜索用时 281 毫秒
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文章针对遵秦高速公路隧道花岗岩弃渣的资源化利用以及其在基层应用的可行性等问题,分析了隧道花岗岩弃渣碎石的级配组成、压碎值、针片状含量等物理性能,并通过重型击实试验确定隧道花岗岩弃渣水泥稳定基层(以下简称“水泥稳定弃渣”)的最大干密度和最佳含水率:通过测试强度、回弹模量、抗冻性能以及干、温缩特性等路用性能,并与水泥稳定片麻岩、石灰岩进行对比,优化水泥稳定弃渣的各项配合比。结果表明:隧道花岗岩弃渣碎石的级配良好,水泥稳定弃渣的劈裂强度和7 d无侧限抗压强度分别为0.45 MPa和5.13 Ma,集料种类对水泥稳定碎石的力学性能影响较小:28 d试件冻融循环后抗压强度损失为97%~98%,具有良好的抗冻性:隧道花岗岩弃渣的温缩性能优于水泥稳定片麻岩、石灰岩;当水泥稳定弃渣最佳水泥用量为4%、最大干密度为2.334 g/cm3、最佳含水量为4.8%时,满足基层材料的技术要求。 相似文献
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文章以某山区高速公路为例,对隧道弃渣在路基填筑中的应用进行研究,针对该试验路段特点及工程地质情况,制定合理的施工方案及施工方法,对试验路段碎石路基进行分层填筑施工,并通过相关试验得出隧道弃渣填筑路基的应用效果。 相似文献
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弃渣场作为公路、铁路等建设项目的附属工程,设计阶段一般不被重视,随着环保、水保意识的增强,需要对弃渣场进行详细设计,以保证弃渣场稳定,避免水土流失。该文结合蒙华铁路胡家堡弃渣场,对山岭区弃渣场边坡、支挡、排水及绿化进行了综合设计,为同类工程提供一定参考。 相似文献
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文章结合山西某高速公路弃土场的设计实例,对弃土场的设计原则和方法进行探讨,分析了弃土场所能取得的效益,为山区高速公路弃土场设计提供参考。 相似文献
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Rockburst is one of the main disasters for tunnelling under high ground stress. Taking the rockburst section of Ping'an Tunnel with high ground stress, which is located on Chengdu-Lanzhou Railway, as the study object, this paper adopts combined methods of filed measurement, numerical analysis, and laboratory test, and with respect to rockburst development mechanism, energy density change and rockburst strength it comprehensively analyzes the impact of two construction schemes (single-tube double-track tunnel system and double-tube single-track tunnel system) on the rockburst in deep-buried extra-long tunnels with high ground stress. The study results show that the order relation of maximum energy density at various locations of the tunnel is Uside wall >Uhance >Utunnel face >Uvault, and rockburst easily occurs at the working face of the tunnel section to be excavated and both side walls of excavated and supported section; compared with vault, hance, side wall and other locations, more energy would be released at the tunnel face, and the stress release holes shall be reasonably installed in the process of excavation; the doubletube single-track tunnel system scheme can effectively reduce the rockburst intensity and the rockburst hazards, so as to better avoid the occurrence of rockburst. © 2022, Editorial Office of "Modern Tunnelling Technology". All right reserved. 相似文献
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水泥混凝土桥沥青铺装层的破坏主要与荷载作用下产生的应力集中有关,为准确分析桥梁各部应力集中的分布特性和变化规律,文章以线弹性分析理论为基础,采用通用大型有限元分析软件ANSYS,对不同荷载条件下的铺装体系内部拉应力和剪应力进行计算分析。结果表明,将铺装体系内各部最大拉应力和最大剪应力值作为铺装层结构设计和材料选择时的一项重要控制指标是科学合理的。 相似文献
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Based on a shield-driven running tunnel project of Hangzhou Metro Line 2, this paper carries out field measuring of the ground surface deformation caused by two different shield machines in double-tube tunnelling in soft soil areas, obtains the laws of the surface deformation caused by shield-driven double-tube tunnelling and verifies the applicability of the modified Peck formula to double-tube tunnelling. The results show that in soft soil areas the impacts on ground surface deformation caused by different shield construction parameters in the previously and subsequently excavated tunnels are different, while the surface deformation changes sharply before and after the shield machine passing through the cutting face, and a rebound phenomenon occurs when the shield tail passes through the cutting face due to the influence of the grouting; The cutterhead torque of the shield machine in soft soil areas can be composed of five calculation factors, and the calculation results are in good agreement with the measured values. The larger the opening rate of the shield cutterhead is, the larger the average torque value will be, the higher the percentage of large ground loss rate will be, and the larger the maximum ground surface settlement will be; The ratio of cutterhead torque T to mucking volume per ring Q is used as the control parameter for analyzing the ground surface settlement, and a certain positive correlation between the ratio and the surface settlement value is determined, the smaller the cutterhead opening rate is, the more accurate the fitting results will be. © 2022, Editorial Office of "Modern Tunnelling Technology". All right reserved. 相似文献
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半刚性基层材料在使用过程中强度和模量都会随着荷载作用次数的增加逐渐减小。为了对半刚性材料的抗弯拉性能的衰变进行研究,文章选取了四种典型半刚性基层材料为试验对象,研究半刚性基层材料弯拉模量的衰变过程。试验发现:四种半刚性材料的抗弯拉模量随着加载次数的增加不断减小,其模量衰变过程大致可分为三个阶段;不同类型材料的抗弯拉模量衰变规律以及不同衰变阶段的幅度有所不同;半刚性材料级配对其抗弯拉模量值有比较大的影响,但采用粘结料剂量相同,而级配不同,材料的模量衰变幅度、走势及衰变过程基本相同;混合料类型相同但是粘结料不同,其抗弯拉模量衰变过程也不同。 相似文献
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文章通过PLAXIS有限元软件,分析了含硬壳层软土地基在荷载、硬壳层厚度、弹性模量、泊松比变化时的应力扩散特性,得出硬壳层的各种参数对应力分布的影响规律,为软土地基的应力分析提供参考. 相似文献