钢筋混凝土剪力墙结构基于自平衡力的非线性地震反应分析   总被引：6，自引：1，他引：6  

张令心  孙景江等 《地震工程与工程振动》2001,21(4):29-34

本文简要评述了现有钢筋混凝土剪力墙的非线性分析模型，着重介绍了多竖线单元模型，并对其竖向单元的轴向刚度和水平弹簧的剪切刚度分别建议了改进的滞变模型，最后将基于自平衡力的非线性动力反应分析方法应用于求解剪力墙结构的非线性地震反应，并用传统分析方法对其结果进行了检验，表明该分析方法计算简便，而且是有效和可靠的。  相似文献   

江门市某病害挡土墙的工程治理实践     

陈明东  岑伟雄 《地质灾害与环境保护》2001,12(1):77-82

详细介绍了江门市某病挡土墙的工程治理实践，通过对病害挡土墙的原因分析，提出了合理的整治方案及施工处理措施，达到预期整治效果。  相似文献   

气举反循环钻深度的理论计算与加深试验   总被引：2，自引：0，他引：2  

耿令强 《中国煤田地质》2001,13(2):86-87

运用气举反循环钻进、在满足一定条件下适当增加双壁钻具长度即可得到较大钻进孔深，本文通过理论计算及实验，证实了使用现有设备，气举气循环可以更好的满足超午米深水井的施工要求。  相似文献   

关于吉林地区挖孔桩设计问题的探讨     

李向群  袁铁铮 《吉林大学学报(地球科学版)》2001,31(4):372-375

探讨了在吉林地区高层建筑中有关桩基规范执行及设计施工过程中常见的问题。通过对不同直径的桩端进入持力层深度的对比 ,明确 2d与 4d的对比要求 ,即持力层厚度的保证比进入持力层深度更重要。针对通长配筋“一通到底”的设计给施工带来的不便及浪费提出了新的建议。通过实践给出“α”角的建议值 ,既能减小扩大桩头斜面上受到卸荷后侧土压力 ,又可减少施工时的坍方。最后对降水及护壁提出了结合实际地质情况的 4种方法。  相似文献   

Post-earthquake investigation on several geosynthetic-reinforced soil retaining walls and slopes during the Ji-Ji earthquake of Taiwan   总被引：1，自引：0，他引：1  

Hoe I. Ling  Dov Leshchinsky  Nelson N. S. Chou 《Soil Dynamics and Earthquake Engineering》2001,21(4):3087

This paper gives an overview on the application of geosynthetic-reinforced soil structures in Taiwan. Taiwan has an unique topography and geotechnical conditions that rendered a less conservative and more challenging design compared to that of North America, Europe and Japan. The Ji-Ji (Chi-Chi) earthquake of 1999 gave an opportunity to examine the behavior of reinforced soil structures. The performance of several modular-block reinforced soil retaining walls and reinforced slopes at the vicinity of the fault was evaluated. Reinforced structures performed better than unreinforced soil retaining walls. The failure cases were highlighted and the cause of failure was identified. The lack of seismic design consideration could be a major cause of failure. The compound failure mode, the inertia force of the blocks, and the connection stiffness and strength relative to the large dynamic earth pressure, were among major items that would warrant further design consideration.  相似文献   

Stratigraphic Correlation of the Malusok Volcanogenic Massive Sulfide Deposits, Southern Mindanao, Philippines     

Cliff L. QUERUBIN  Graciano P. YUMUL Jr. 《Resource Geology》2001,51(2):135-143

Abstract: Two adjacent volcanogenic massive sulfide (VMS) deposits, the Main Malusok and the Malusok Southeast, are delineated within Barangay Tabayo, Siocon, Zamboanga del Norte, Mindanao, Philippines. These deposits comprise massive to semi-massive sulfide lenses representing the down-dip equivalent of oxidized gossans. The massive sulfides have a primary mineral assemblage of pyrite-chalcopyrite-sphalerite with significant amounts of supergene copper in the form of chal-cocite. Owing to structural and metamorphic overprinting combined with intense alteration, primary textures are generally obliterated. Rock types are classified according to dominant mineral assemblages whereas the main lithologic units comprising the Malusok volcanic package are divided based on the position of each unit relative to the mineralized zone. The main lithologic units are designated as the hanging wall, the host, and the footwall sequences. In correlating the stratigraphy of the Main Malusok zone with that of the Malusok Southeast zone, a chlorite/epidote-rich interval located at the base of the hanging wall sequence serves as a distinct stratigraphic marker from which all lithologies are referred to. Comparisons between the stratigraphy of the two areas show that massive to semi-massive sulfide lenses are confined within a single stratigraphic interval representing the favorable horizon for the entire Malusok area. However, differences exist relative to style of mineralization and configuration of the altered interval between the Main Malusok and the Malusok Southeast VMS deposits. Based on characteristics exhibited by each individual deposit, it is inferred that the Main Malusok VMS deposit overlies a feeder zone whereas the Malusok Southeast sulfide lenses represent satellite deposits and transported blocks.  相似文献   

成槽作业中泥浆的护壁作用分析   总被引：1，自引：0，他引：1       下载免费PDF全文

李小青  潘鸿宝 《探矿工程》2001,(4):21-23

根据土层的物理力学性质、地下水位分析护壁泥浆对地下连续墙槽壁稳定性的影响，导出槽壁稳定性数学模型公式，并提出相应的护壁措施，防止槽壁的坍塌。  相似文献   

Aseismio fault slip and block deformation in North China   总被引：1，自引：0，他引：1  

Lanbo Liu  Alan T. Linde  I. Selwyn Sacks  Shihai He 《Pure and Applied Geophysics》1996,146(3-4):717-740

In North China, the tectonic fault-block system enables us to use the Discontinuous Deformation Analysis (DDA) method to simulate the long-term cross-fault survey and other geodetic data related to aseismic tectonic deformation. By the simulation we have found that: (1) Slips on faults with different orientation are generally in agreement with the ENE-WSW tectonic stress field, but the slip pattern of faulting can vary from nearly orthogonal, to pure shear along the strike of the faults, this pattern cannot be explained by simple geometric relation between the strike of the fault and the direction of the tectonic shortening. This phenomenon has been observed at many sites of cross-fault geodetic surveys, and might be caused by the interactions between different blocks and faults. (2) According to the DDA model, if the average aseismic slip rate along major active faults is at the order of several tenths of millimeter per year as observed by the cross-fault geodetic surveys, the typical strain rate inside a block is at the order of 10^–8 year^–1 or less, so that the rate of 10^–6 year^–1, as reported by observations in smaller areas, cannot be the representative deformation rate in this region. (3) Between the slips caused by regional compression and block rotation, there is a possibility that the sense of slip caused by rigid body rotation in two adjacent blocks is opposite to the slip caused by the tectonic compression. But the magnitude of slip resulting from the tectonic compression is much larger than that due to the block rotation. Thus, in general, the slip pattern on faults as a whole agrees with the sense of tectonic compression in this region. That is to say, the slip caused by regional compression dominates the entire slip budget. (4) Based on (3), some observed slips in contradiction to ENE tectonic stress field may be caused by more localized sources, and have no tectonic significance.  相似文献   

上海地区村镇民房震害预测方法探讨——以宝山区(Ⅵ度)震害预测为例     

陈绍福  何越教 《上海国土资源》1992,(2)

本文通过对上海地区地震危险性分析,论述了上海地区开展村镇民房震害预测的必要性。根据上海地区的建筑特点,并以宝山区Ⅵ度震害预测为例,对上海地区村镇民房震害预测方法的可行性进行了探讨。  相似文献   

X射线荧光探矿技术在福建紫金山铜矿区的应用效果     

许春林 《物探与化探》1993,17(2):116-119

应用放射性同位素x射线荧光分析仪测定各种元素含量在许多文献中均有报道。本文主要介绍84A86型轻便x射线荧光分析仪首次在福建省紫金山铜矿区测定粉末样、块状岩心、坑道壁中铜矿的含量及其所取得的经济效益。  相似文献