黄土动力学数据处理软件的研制          下载免费PDF全文

袁中夏  王兰民  李明勇 《地震工程学报》2004,26(1):28-31,49

从数据分析和处理流程和功能模块设计方面讨论了应用Visual Basic进行土动力学数据处理系统开发时的问题及可行的解决方案，介绍了编制的土动力学数据处理系统的主要功能。  相似文献   

氰化液中Ag的现场测定     

薛光  刘玖芬  刘自娟 《黄金地质》2004,10(2):69-71

已往测定氰化液中Ag的方法只适用于化学成分简单的样品，对于成分较复杂，尤其是Cu，Pb，Zn浓度较高的氰化液，其测定Ag的重现性较差。现场测定氰化液中Ag的方法是基于采用HNO3 H2O2(过氧化氢)破坏氰化液中的[CN]-，在10％HNO3介质中以CCX富集分离Ag。吸附在CCX上的Ag经灰化法解脱后在pH值为3．3的CH3COOH(乙酸)-CH3COONa(乙酸钠)缓冲溶液中，以Au试剂液珠萃取比色法进行测定。选择一个已知含量的氰化液进行10次测定，方法的测定下限为0．1μg／mL，RSD为5．8％，分析结果能满足选冶生产工艺的需要。  相似文献   

上海地区扁铲侧胀试验计算地基承载力的探讨   总被引：1，自引：1，他引：1  

樊向阳  莫群欢  张继红 《岩土工程技术》2004,18(3):126-129

通过对扁铲侧胀试验和试验机理的研究和对试验指数的对比分析 ,提出了用扁铲侧胀试验计算地基承载力的方法 ;利用上海地区部分重大工程中的扁铲侧胀试验数据 ,在与室内土工试验、静力触探试验及十字板剪切试验的相关分析的基础上 ,经数理统计后给出了上海地区用扁铲侧胀试验计算地基承载力的经验公式。最后 ,通过与室内土工试验、静力触探试验和十字板剪切试验计算的地基承载力对比 ,分析了本经验公式计算地基承载力的精度。研究分析表明 ,可以用扁铲侧胀试验计算地基承载力  相似文献   

水域静力触探设备的研制和应用     

刘荣毅  陈光顺 《岩土工程技术》2004,18(3):161-162

为详细了解崇明越江通道南港隧道段地层情况 ,设计要求提供长江水域静探资料。简介了我院水域静力触探设备的研制和应用情况  相似文献   

模拟试验法确定桩基承载力   总被引：3，自引：0，他引：3  

亓宾  佴磊  江娟 《吉林大学学报(地球科学版)》2004,(Z1)

通过室内中型剪切摩擦试验确定桩与地层间的C、Φ值,依据莫尔—库仑准则确定桩侧摩阻力。桩侧法向应力采用桩土上部荷载引起的作用于桩身的侧向应力,桩端承载力通过室内三轴试验确定,两者之和即为单桩承载力。该方法用于肇源松花江大桥桩基承载力的测试,得出的桩承载力与实测值吻合较好,取得了预期的效果。  相似文献   

大同市(平原区)地下水超采现状及治理措施   总被引：3，自引：0，他引：3  

王宏  吕玉萍 《地下水》2004,26(4):297-299

通过分析大同市平原区地下水超采现状,指出地下水超采容易引起的水环境问题,针对日益紧张的水资源供需矛盾和地下水起采引起的水环境问题,提出了超采区的治理措施.  相似文献   

Interactive behavior of soil–pile-superstructure system in transient state to liquefaction by means of large shake table tests     

Shintaro Yao  Koichi Kobayashi  Nozomu Yoshida  Hiroshi Matsuo 《Soil Dynamics and Earthquake Engineering》2004,24(5):572-409

Shaking table tests were conducted by means of a large-scale laminar box with 4 m in length, 2 m in width and 2 m in height in order to investigate behavior of a soil-pile-superstructure system in liquefiable ground. A model two-storey structure, supported by a pile group, was set in a saturated sand deposit, and subjected to a sinusoidal base motion with increasing amplitude. Discussions are focused on the transient behavior until soil liquefaction occurs. Main interests are characteristics of springs used in a sway-rocking model and a multi-freedom lumped mass (MFLM) model that are frequently used in soil–pile interaction analysis. The spring constant in the sway-rocking model is represented by restoring force characteristics at the pile head, and that in the MFLM system is represented by an interaction spring connecting the pile to the free field. The transient state prior to soil liquefaction is shown to be important in the design of a pile because dynamic earth pressure shows peak response in this state. The reduction of the stiffness due to excess porewater generation and strain dependent nonlinear behavior is evaluated.  相似文献   

Evaluation of soil liquefaction in the Chi-Chi, Taiwan earthquake using CPT   总被引：1，自引：0，他引：1  

Chih-Sheng Ku  Der-Her Lee  Jian-Hong Wu 《Soil Dynamics and Earthquake Engineering》2004,24(9-10):659

During the 1999 Chi-Chi, Taiwan earthquake, many sand boiling phenomena were observed in central Taiwan, which caused severe ground settlement and structure damages. According to the installed accelerograms, the peak ground surface horizontal accelerations in the liquefaction-affected areas range from 774.42 to 121.3 gal. The writers carried out an extensive investigation of soil liquefaction in this earthquake. In this paper, we present results of the CPT exploration and post-earthquake liquefaction analysis. Two hundred and seventy five (275) cone penetration test data were collected from the liquefaction-affected areas, and 46 liquefaction case histories and 88 non-liquefaction case histories were derived that can be used to evaluate the accuracy of existing liquefaction evaluation models. In addition, the strength of the liquefied soils after earthquake and the implication of its liquefaction potential in the future event are discussed.  相似文献   

An experimental study on seismic responses of multifunctional vibration‐absorption reinforced concrete megaframe structures     

Zongjian Lan  Yuji Tian  Liang Fang  Shuting Liang  Xinde Wang 《地震工程与结构动力学》2004,33(1):1-14

Two models are tested on a shake‐table. One of the models is a normal reinforced concrete megaframe structure and the other is a multifunctional vibration‐absorption reinforced concrete megaframe structure in which the laminated rubber bearings are placed between the major frame and the minor frames. Two earthquake motions (the El Centro wave and the Taft wave) are used during the test. This paper presents the dynamic characteristic, the seismic responses and the failure mechanism of these two models under varying peak acceleration levels for each of the earthquake motions. The test results demonstrate that the aseismic behavior of a multifunctional vibration‐absorption reinforced concrete megaframe structure is much better than that of a normal reinforced concrete megaframe structure. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

Dynamic performance of twin curved cable‐stayed bridges     

C. Gentile  F. Martinez y Cabrera 《地震工程与结构动力学》2004,33(1):15-34

The dynamic behaviour of two curved cable‐stayed bridges, recently constructed in northern Italy, has been investigated by full‐scale testing and theoretical models. Two different excitation techniques were employed in the dynamic tests: traffic‐induced ambient vibrations and free vibrations. Since the modal behaviour identified from the two types of test are very well correlated and a greater number of normal modes was detected during ambient vibration tests, the validity of the ambient vibration survey is assessed in view of future monitoring. For both bridges, 11 vibration modes were identified in the frequency range of 0ndash;10Hz, being a one‐to‐one correspondence between the observed modes of the two bridges. Successively, the information obtained from the field tests was used to validate and improve 3D finite elements so that the dynamic performance of the two systems were assessed and compared based on both the experimental results and the updated theoretical models. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献