The deformation of a deep foundation pit in Ulanqab city was analyzed by in situ monitoring and numerical simulation data. First, a limit equilibrium method was used to evaluate the stability of foundation pit under non-supporting and ribbed plate anchored retaining wall support. The results show that the ribbed plate anchored retaining wall support could control the soil deformation effectively in deep foundation pit. Additionally, a three-dimensional finite difference model of excavation zone and reinforcement structure was established using FLAC3D software to simulate the excavation of deep foundation pit. The simulation results were verified by monitoring field data. The simulation results show that all the bolts are in the tension state, and the maximum axial force is located at the end of the bolt, with a value of 46.4 kN. Foundation pit excavation is a continuous stress release process, making the rock and soil of side wall of foundation pit slide towards the free surface. The largest deformation is 4.0 mm, near the side wall of foundation pit, consistent with the deformation monitoring results.
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排序方式： 共有11条查询结果，搜索用时 281 毫秒
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矿石中金的在线固相萃取及缝管火焰原子吸收测定 总被引：3，自引：0，他引：3
介绍了将流动注射在线因相萃取预浓集与石英缝管火焰原子吸收相结合测定矿石中金的方法，用ＸＡＤ－８吸附树脂填充的微型柱（１００μｌ）在６ｍｌ／ｍｉｎ的流速下，从０．５ｍｏｌ／ＬＨＣｌ介质的试样溶液中浓集金氯络合物，再用乙醇洗脱，最后由火焰原子吸收检测，在采样频率为１０３样／ｈ的流速下灵敏度提高４７倍，分析精度为１．３％，检出限为１．０μｇ／Ｌ；在６５样／ｈ的采样频率下灵敏度提高９５倍，检出限可达０．７ 相似文献
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This paper expounds the features of the buildings and analyzes the seismic disaster characteristics of the Jiuzhaigou M_S7. 0 earthquake in the area between Songpan and Jiuzhaigou. New buildings (especially the frame structure) had good anti-seismic performance,but brick-wood structures and brick-concrete structures sustained large amounts of damage in the earthquake. By computing the seismic damage index,we found that the seismic damage index of the frame structure was far less than that of civil structures and brick-wood structures. The seismic damage index of frame structures were all zero in the Ⅵ area,and increased rapidly with the increase of intensity,but the increasing range was reduced. We also discussed how to evaluate the intensity in areas where there was a lack of buildings or there was only one structure type,which can be referenced in future field work. 相似文献
3.
SONG Peng TAN Jun LIU Zhaolun ZHANG Xiaobo LIU Baohua YU Kaiben LI Jinshan XIA Dongming XIE Chuang 《中国海洋大学学报(英文版)》2019,(4)
The gradient preconditioning approach based on seismic wave energy can effectively avoid the huge memory consumption of the gradient preconditioning algorithms based on the Hessian matrix. However, the accuracy of this approach is prone to be influenced by the energy of reflected waves. To tackle this problem, the paper proposes a new gradient preconditioning method based on the energy of transmitted waves. The approach scales the gradient through a precondition factor, which is calculated by the ‘approximate transmission wavefield' simulation based on the nonreflecting acoustic wave equation. The method requires no computing nor storing of the Hessian matrix and its inverse matrix. Furthermore, the proposed method can effectively eliminate the effects of geometric spreading and disproportionality in the gradient illumination. The results of model experiments show that the time-domain full waveform inversion(FWI) using the gradient preconditioning based on transmitted wave energy can achieve higher inversion accuracy for deep high-velocity bodies and their underlying strata in comparison with the one using the gradient preconditioning based on seismic wave energy. The field marine seismic data test shows that our proposed method is also highly applicable to the FWI of field marine seismic data. 相似文献
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土体动力参数是表征土动力特性的重要指标,对抗震计算具有重要影响。利用GCTS共振柱仪对淤泥、黏土、粉质黏土和粉砂进行共振柱试验,对Hardin—Drnevich提出的双曲线模型的模量比表达式进行线性拟合与改进的非线性拟合对比研究。结果表明：改进的非线性拟合得到的曲线较线性拟合曲线更加接近原始数据点;在低应变处,非线性拟合残差小于线性拟合残差,随着应变增加非线性拟合的残差接近线性拟合残差,在大应变处线性拟合残差小于非线性拟合的残差;改进的非线性拟合的最大动剪切模量Gdmax和参考剪应变γr的标准误差及置信区间宽度均比线性拟合的结果小;拟合优度评价指标表明改进非线性拟合效果优于线性拟合效果。将线性拟合结果作为非线性拟合方法的初始值的改进方法较线性拟合方法具有更高的准确性和稳定性,并具有更高的应用价值。 相似文献
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研究支持向量机方法在小样本地震信号识别方面的可行性,结果表明,随着样本量增加,该方法的识别率出现先升高再降低的现象。使用山东和江苏地区2006~2017年的地震数据进行实验,仅需每类30个训练样本即可达到85%左右的识别率。该方法识别率的提高不依赖于大量样本的加入,不仅适合于地震数据样本量少的地区开展地震信号识别研究,而且为精简样本库、降低运行成本提供了新思路。 相似文献
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银的流动注射蒸气发生原子吸收光谱分析初步研究 总被引：5，自引：0，他引：5
对银的流动注射蒸气发生原子吸收光谱分析方法进行了初步研究。首次观察到银可在流动注射氢化物发生条件下生成挥发性气态物质。经过对银气态物质发生的化学条件如样品和载流溶液酸度,硼氢化钠浓度等以及流动注射参数如反应管道长度,进样体积,载流和试剂溶液流速,载气流速等的优化,初步建立了银的蒸气发生原子吸收光谱分析方法。 相似文献
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对九寨沟7.0级地震松潘至九寨沟各烈度区的房屋结构特点和震害特征进行了分析。该地区新建建筑(尤其是框架结构)抗震性能良好,砖混、砖木等结构整体性较差,地震中损坏普遍。通过计算分析震害指数后发现,框架结构震害指数远小于土木、砖木结构;在Ⅵ度区框架结构震害指数普遍为0,随烈度增加,框架结构的震害指数快速增加,而增加幅度逐渐减小。此外,探讨了缺乏建筑物的地区以及建筑物结构为单一框架结构地区的烈度评定问题并给出了相关的建议,以期对今后的地震现场工作起到参考借鉴作用。 相似文献
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关于流动注射分析今后发展的若干见解 总被引：2，自引：0，他引：2
针对目前流动注射分析（ＦＩＡ）的应用广泛程度落后于ＦＩＡ技术的研究和发展问题，提出了未来发展中的关键环节是商品仪器的稳定性、耐用性、简易性和专用化。未来发展的重要方向是开发其它分析技术不可替代的功能，即不稳定反应的定量分析、高分辨过程分析、ＦＩ在线分离与浓集、智能化校正体系等。 相似文献
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