Advanced Materials Research Vols. 250-253

Abstract: This study explains the use of resistivity imaging profiling. The Resistivity Imaging Profiling (RIP) became the one of some important techniques in order to get more information for finding out some hidden water in geophysical survey and this has been applied in Beriah Landfill Site in task of exploring the location storing underground water. Two dimensional geoelectrical imaging has been applied for this study. The method can be used for map the distribution of resistivity for the subsurface materials layer. The principle goals of this survey are to define the depth of aquifer layers from the subsoil, the water table and the depth of bedrock as well as suitable site for well. The imaging method was used in this study to map the subsurface soil and groundwater in and around the landfill area that includes six resistivity line. Surveys were conducted using SAS4000 resistivity meter and ABEM LUND electrode and the measured resistivity profiles were interpreted with 2-D resistivity inversion programme (RES2DINV) software presented by two dimensions which is axis-x represent as a length on the ground surface while axis-y referred to the depth of the subsurface in meter.

Abstract: This paper focusing on the crack at hole of guyed-mast’s ear-plate connecting cables and shaft of guyed-mast, adopting two degree of freedom crack propagation model, track the crack propagation according to the increment of the deepest point and the surface point on the crack front of crack at hole of guyed-mast’s ear-plate. The stress intensity factors of I,II and III type crack with given shape and size have been calculated via finite element method, and a numerical method of calculating stress intensity factors with any shape and size crack has been proposed; furthermore according to modified I, II and III type compound crack propagation velocity formula on the basis of Paris crack propagation velocity formula, we analyzed the changing of crack shape parameter a/c with crack size parameter a/T of crack at hole of ear-plate connecting cable and shaft of guyed-mast by numerical integration method and obtained the propagation characteristic.

Abstract: First, the features of raw-soil structure in China are introduced briefly from its building materials, its building mode, its structure system and houses damage in the earthquakes. Then its research process and present condition is summarized, and the results of investigation in recent years of raw-soil structure in China are presented. For raw-soil structure in China, the development of experimental study on the seismic performance is expounded from the performance of its materials, the bearing capacity and seismic performance of the bearing wall, its constructional measures, and the whole of the structure, etc. The results of constructing method and related norms written of raw-soil structure are summarized. The problems of the seismic ability of raw-soil structure are pointed out. Finally, the development of raw-soil structure in China is predicted in the future.

Abstract: During May 12th 2008 Wenchuan earthquake with the magnitude of 8.0, a 4-span rigid frame arch bridge named as Xiaoyudong Bridge which situated close to the epicenter was hit by strong ground motion and was severely damaged. The earthquake response analysis of the bridge was made using FE software MIDAS based on recorded ground motion during the Wenchuan earthquake in this paper. The study showed that the main and minor arch legs on the both ends piers were weak links which may be damaged firstly under strong ground motion. The next damage at the pier with weakest horizontal stiffness is one of the important reasons causing the bridge collapsed. This paper will introduce our work on those respects and some drawn conclusions.

Abstract: Grouting is often adopted in a tunnel to resist high external water pressure; the tunnel is defined as External Water Pressure-Resistant Tunnel (EWPR Tunnel). When the grouting reinforcement does not seal the high pressure groundwater completely and the leakage groundwater is drained by drainage system, the tunnel can be called a Drained External Water Pressure -Resistant Tunnel with limited Drainage (DEWPR Tunnel), the grouting reinforcement and waterproof/drainage system of which are great important and should be considered specially. Take the traffic tunnels of Jinping Second Cascade Hydropower Station as an example, a numerical method is adopted to simulate the influence of grouting reinforcement thickness on the distribution of external water pressure. The results indicate that the discharge rate per unit length is 7.82m2/d with single tunnel drainage and 5.28m2/d with double-tunnel drainage, and the external water pressure can be reduced less than 0.6MPa when the thickness of grouting reinforcement is 12m based on the control factor of volume of water discharge.

Abstract: The study scrutinizes the groundwater evolution and its relation in the Kerian irrigation scheme of Perak region using isotope and hydrochemical analyses. Nine representative groundwater samples were collected from nine different wells that cover the Kerian area. The samples are analyzed on geochemical characteristics, ionic composition and hydrofacies. Resistivity image profiling (RIP) surveys were carried out in tracing the existing of aquifer layer. The major ionic compositions show a wide variation in the hydrochemical properties of groundwater of the area. The degree correspondences among cations and anions have been estimated in order to evaluate their mutual relationship. The important hydrogeophysical parameters have been estimated for reasonable assessment of groundwater quality for irrigation purposes. Piper Diagrams have been plotted to classify the hydrofacies and Wilcox plot as well to quickly determine the viability of water for irrigation used. Interpretations of environmental isotope (¹⁸O and ²H) are applied to groundwater studies in the study area. The isotopic composition of ¹⁸O and ²H of groundwater and surface water have small variations and plot close to the global meteoric water line as well as local meteoric water line.

Abstract: In this paper, a new type of large span prestressed concrete integral roof was studied. The test uses full scale specimens, the roof’s span is 24 meters, the width is 2 meters, across the tallest is 3.6 meters. The different condition of roof structure properties is examined. Through experiment obtaines the deformation and the ultimate bearing capacity of the roof, the design is proved to be correct. Test results show that the roof system with one piece casting has enough bearing capacity and rigidity. Roof destruction presents brittleness nature, destroying position is in lower chord board near the end of place. This research conclusion provides a reference data for this type of roof of popularization and application.

Abstract: Consolidation coefficient and percent consolidation of soft clay were calculated according to the measured pore water pressure of a project in Pudong Shanghai. Calculated coefficient of consolidation was one magnitude larger than the experimental one. This was in conformity with the actual consolidation process of dynamically-consolidated soft soil.

Abstract: With many large cities accelerating the pace of urban expressway construction, at the same time it has to be thought-provoking which factors is related with the urban expressway operating speed In this paper, the difference is based on the use of certain urban expressway speed of the computational model and measured to compare the average operating speed of analysis. Then analyzed and listed that may affect urban freeway speed factors, for the future of urban freeway speed computing model to provide some ideas.

Abstract: The element-free spline method is proposed to analyze the vibration of the functionally graded material (FGM) plate with various boundaries. The field functions are constructed by using the linear combination of double B-spline basis functions together with mixed displacement parameters and then an equation based on Reddy's third order plate theory is developed for the vibration analysis of the FGM plate. The validity of the proposed method is illustrated by some numerical examples. Six lower vibration frequencies of FGM plate are calculated under various boundaries and the influence of boundary condition and material gradient on vibration frequencies are also discussed. The proposed method needs less computational cost and has high accuracy.