Advanced Materials Research Vols. 261-263

Abstract: Debris flow has a very strong destructive power which can cause a great loss of human lives and belongings, so for the purpose of a better disaster prevention and reduction, it is necessary to strengthen the knowledge about the characteristics and regulations of the motion process of debris flow. In order to analyze debris flow entrainment of path material and the influence of the distribution of entrainment zone on the dynamic process of debris flow, the numerical simulation of debris flow dynamic process of different entrainment zones is achieved by combining the theory of SH granular flow and the method of finite volume discretization. The calculation results show that due to energy loss and momentum transfer, the overall speed of debris flow is decreased and the part flow depth increased, but when the entrainment zone is at high position, the entrainment happens early, and the after-entrainment acceleration is more significant, so the mass increased by the entrainment will cause a larger disaster zone and a stronger destruction.

Abstract: With fast research and development, economic and effectual materials have been the focal point of all over the world all the time. This experiment studies and uses a new kind of economic and suitable Ionic Soil Stabilizer (ISS for short). Based on the red clay of Wuhan reinforced by Ionic Soil Stabilizer, the red clay is treated by different matches of ISS and water at first, then is tested in the unconfined compressive strength test, shrinkage test, free swell test, and spectrum test. The results show that unconfined compressive strength increases, and the linear shrinkage, shrinkage limit and free swell decrease after mixing the ISS into the red clay. In addition, spectrum tests show that after the red clay is treated by ISS, soil particles on the surface of the C elements had changed markedly, from scratch, confirmed the ISS elements combined with the role of soil particles.

Abstract: In this paper, a simple and practical performance-based seismic design (PBSD) method for regular highway bridges is suggested. In the proposed PBSD method, the drift ratio of the bridge column is employed as quantitative indices of seismic performance levels, and its target values for each seismic performance level are given. The whole design processes of a regular highway bridge with various performance objects under different seismic levels are demonstrated.

Abstract: Frame supporting structure with prestressed anchors is a new anchoring technology applied in slope reinforcement in recent years. Its dynamical analysis and seismic design is a big challenge, a set of systematic calculation methods can not be found for the time being. This paper shall first evaluate the calculation formula of anchoring slope earthquake earth pressure, then establish dynamic calculation model of frame supporting structure with prestressed anchors, solve using FORCE METHOD, finally apply the proposed method in engineering project. The result shows that this method is applicable to loess areas with uniform soil texture, providing the theoretical basis for seismic design of frame supporting with prestressed anchors.

Abstract: A dynamic calculation model of the pile supporting structure with one layer prestressed anchor for the slope is proposed in this paper. The prestressed anchor is regarded as the elastic support of the pile body. According to the theory of one-dimension elastic wave propagation, the interaction between the pile and the soil is obtained. Then the motion equation of the pile-prestressed anchor is established based on the dynamic interaction. The analytical solutions are obtained. In addition the proposed method is applied to a project case to carry out the seismic analysis and design of the pile supporting structure with one layer prestressed anchor. The calculation method provides a theoretical basis for earthquake response analysis and seismic design of the pile supporting structure with one layer prestressed anchor.

Abstract: Highway slope deformation monitoring is an important guarantee for the safety of road transport means, the conventional GPS monitoring system has many advantages, but the monitoring of high cost lead to difficult application. Through the use of GPS multi-antenna network technology, use of automatic control technology, low-noise signal amplification technology, the wireless GPRS data transmission technology, remote automated highway slope monitoring, GPS network monitoring system can greatly reduce the cost to obtain reliable slope deformation information.

Abstract: This paper takes Shenyang metro engineering with sandy soil for background, and the ground settlement induced by shielding tunneling construction is predicated and analyzed. Make clear the influential areas of lateral settlement in accordance with the monitoring data. Use traditional Peck Formula to fit actual settlement curve of the cross-section. From the curve fitted by Lagrange interpolation function, the half width i of the settlement tank can be gained. And then calculate the volume of the settlement tank, the improvement factor k and volume loss rate V_L. The Peck Formula with improved factors can suitably predict the ground surface settlement.

Abstract: For various engineering slopes, due to unloading relaxation of the rock mass or sliding disintegration of the slope, the cracks inside the slope will open by different extent, thus when measuring radon content, different parts of the slope will have different radon content anomaly. Through analyzing radon content anomaly, information as the landslide boundary and structure zoning of the slope rock mass, etc can be obtained. Landslide boundaries and rock mass structure zoning and other information can be identified because of radon anomalies analysis. Through radon anomalies analysis on two projects, landslide boundary identification and zoning on bank-slope adit rock mass structure, it has proved that radon anomalies analysis could be well used as a complementary method to provide more analysis data and thus provide objective scientific basis for slope stability study. The analysis method used is simple, easy to operate, and low in cost. In the analysis, it shall be noted that removing interference from groundwater, desiccant humidity should be excluded.

Abstract: The area of international Karakorum Highway(KKH), is an area with dense and frequent glacial debris flow disasters due to unique geology, geomorphology and landform conditions,which connects northern Pakistan with northwestward China. After in situ investigation and analyze the present data of these glacier debris flow, by using the fuzzy evaluation method, we selected seven factors,such as occurrence frequency,catchment areas,volumes of alluvial fan,estimated outflow of every time,vegetation coverage, slope and altitude, as main factors for evaluating the activity degree of 8 chosen representative glacier debris flows along KKH. According to the evaluation results,which are showed a good correspond with the practical situation, it can conclude that the fuzzy evaluation method based on the fuzzy mathematics theory is an very effective evaluation method in dealing with glacial debris flow with lots of fuzzy factors,i.e. this method is available for evaluating the activity degree of glacier debris flows.

Abstract: Known as “the Millennium Town beside the Yellow River” Qingcheng Town in Yuzhong County has many rich cultural heritages and profound cultural foundation. Its terrain belongs to the typical Yellow River Valley. It was an important traffic wharf of the ancient Silk Road, and a terminal frontier military center from Tang Dynasty to Ming Dynasty. By researching and analyzing the Qingcheng town, the thesis summarizes its characteristics of the spatial layout and ecological culture.