浅谈高速公路红砂岩路基施工技术与质量控制

本文是作者结合高速公路红砂岩施工中的经验,从填筑、爆破、施工工艺等各方面简要阐述高速公路红砂岩路基施工技术与质量控制。     

红砂岩掺配建筑垃圾和生活垃圾及煤矸石制砖技术

本文简要介绍以红砂岩、建筑垃圾、生活垃圾及煤矸石为原料制砖专利技术。     

Field tests on mechanical characteristics and strength parameters of red-sandstone

Large-scale field shear tests on ten specimens of the red-sandstone embankment at a highway in Hunan, China, were performed to examine mechanical characteristics and parameters of red-sandstone. The curves of thrust-dispiacement, failure mode, and shear strength parameters for red-sandstone with different water contents, different compactions, and different grain size distributions were obtained from the tests. A practical procedure of in-situ test for red-sandstone embankment was proposed to normalize the test equipment and test steps. Based on three-dimensional thrust-sliding limit equilibrium method, the formulas for calculating strength parameters of red-sandstone considering three-dimensional sliding surface were inferred. The results show that red-sandstone has typical complete curves of stress-strain, strain softening, which are caused by the special structure of red-sandstone; water content and compaction are important factors for strength and failure mode of red-sandstone; The average value of cohesion and internal friction angle of the specimens calculated by three-dimensional technique are 21.56 kPa and 29.29°, respectively, and those by traditional two-dimensional method are 25.52 kPa and 33.76°, respectively.     

广州白云国际会议中心背栓式红砂岩幕墙工程质量控制

广州市白云国际会议中心外幕墙采用背栓式红砂岩、玻璃、铝板等材料组合而成,为中国最大的红砂岩外幕墙工程。本文主要介绍了背栓式外墙红砂岩石板块加工和幕墙施工以及该工艺在施工过程中的施工质量控制要求。     

低温环境下红砂岩蠕变特性及其模型

为研究低温环境下岩体工程的长期稳定性,以饱水状态下的陕西红砂岩为研究对象,采用MTS810岩石力学试验机进行不同温度(20,-10,-20℃)条件下的分级加卸载单轴蠕变试验,研究了不同温度条件下红砂岩的蠕变特性及温度对岩石蠕变特性的影响。根据蠕变试验结果,将岩样总应变分为瞬时应变和蠕变应变,瞬时应变由瞬时弹性和瞬时塑性应变组成,蠕变应变由黏弹性和黏塑性应变组成。结果表明,瞬时应变随应力水平的增加而增大,瞬时弹性应变与应力呈近似线性关系;随着应力水平的增加,黏塑性应变随时间逐渐增加,总应变中黏塑性应变的比例也趋于增大。随着温度的降低,岩样瞬时应变及相同应力水平下的蠕变应变均减小,蠕变持续时间延长,岩石破坏强度提高。根据岩样的变形特性结合蠕变试验结果,引入分数阶微积分,建立考虑低温影响的非线性流变模型;采用通用全局优化算法结合最小二乘法中的Levenberg-Marquarat算法对不同温度环境中的蠕变试验结果进行参数识别,理论曲线与试验结果吻合度较高,尤其加速蠕变阶段效果较好,表明该模型能够很好地描述红砂岩在低温环境下的蠕变行为;对不同温度条件下的模型参数进行分析,结果表明,随着温度的降...     

降雨因素对红砂岩风化土路基边坡稳定性的影响分析

为得到降雨因素对红砂岩风化土路基边坡稳定性的影响规律,对某高速公路路基剖面进行建模,基于非饱和土理论,运用ABAQUS有限元软件进行降雨条件下的渗流场数值计算,分析了降雨强度、降雨时长对路基边坡的稳定影响。结果表明:随着降雨时长、降雨强度的增大,红砂岩风化土的饱和度会增大,路基边坡的安全系数呈现下降趋势,但降雨初期对边坡的影响较大,随着持续的降雨,红砂岩风化土逐渐趋于饱和,边坡安全系数下降幅度趋缓;降雨会导致路基顶部下沉,坡脚发生大的水平位移,稳定性大幅下降,进而导致路基失稳。     

Experimental study on the expansive deformation of red sandstone of Hongshanyao

An experience formula of expansive strain and stone taken from a foundation pit of Hongshanyao Project (HSYP) in Nanjing was described. It is clear that the curve of expansive strain-water content is a logarithm. In the meantime, the relation of expansive strain with time was studied and the importance of expansive stabilization time was illuminated. The experiment results indicated that the water content has a tremendous effect on peak expansive and steady expansive deformation of swelling red sandstone.     

红砂岩公路绿化工程的设计

文章针对粤北山区高温多雨,广泛分布红砂岩,结合国道323线南雄头塘铺至古市段(K264 721.05~K280 928)一级路改造绿化工程的建设情况,阐述了公路绿化对公路环境改善的作用。为红砂岩公路绿化建设及设计提供借鉴经验。     

金华地区红砂岩路基施工技术与质量控制

通过室内试验,结合红砂岩路基施工中经验,详细介绍了红砂岩作为一种建筑材料,在市政道路建设方面的路用性质,其作为路基材料在填筑路基应注意的各事项,容易发生的病害以及预防处理的措施.     

兰州地铁某车站红砂岩地层深基坑开挖地表沉降规律分析

为揭示红砂岩地层深基坑开挖地表沉降规律,以兰州地铁某车站深基坑为背景,在现场监测实测数据的基础上,分析了红砂岩地层深基坑地表沉降与开挖深度、围护结构侧向位移与开挖深度以及地表沉降与围护结构侧向位移的关系.研究结果表明,地表沉降曲线呈凹槽形分布,地表最大沉降发生距离坑边为6~10 m;围护结构最大侧向位移发生位置到地表距离为8~12 m,基坑周边地表最大沉降平均值为0.101%He;围护结构最大侧向位移平均值为0.122%He.研究结果可以为兰州地铁深基坑设计与施工提供参考.