A large scale shaking table test was carried out to study the failure modes of slope stabilized by frame beam with prestressed anchors. Based on Hilbert–Huang Transform (HHT), damage identification analysis performed using marginal spectrum obtained from acceleration responses. The results tests show that seismic anchors mainly occurs at top sliding mass and free surface slope. upper part layer begins under excitation low amplitudes. Because existing anchor cable beam, middle lower parts...

Abstract Based on the similarity theory, two physical testing models (double-hole tunnel and single-hole tunnel) with a scale of 1:10 were designed manufactured. A series shaking table tests followed by numerical simulations was carried out to obtain dynamic response characteristics shallow-buried tunnels asymmetrical pressure distributions. The similarities differences in laws between double-hole studied. effects types seismic wave (Wenchuan wave, Darui artificial Kobe wave), peaks...

An accurate description of the load transfer behaviors geosynthetic-encased stone column (GESC) is great importance for revealing bearing capacity GESC. Static tests and shake table model were performed to characterize static dynamic composite foundation reinforced by Under loading, conducted on a fully (FGESC), partially (PGESC) traditional (TSC). The influence length stiffness encasement columns investigated. seismic analyze differences pile-soil stress responses between foundations with...

In order to obtain the seismic internal force response laws of a shallow‐bias tunnel with small clear distance, reliability numerical simulation is verified by shaking table model test. The parameter sensitivity studied using MIDAS‐NX finite element software. effects wave peak (0.1 g, 0.2 0.3 0.4 0.5 and 0.6 g), existing slope angle (30°, 45°, 60°, 90°), distance (1.0 D, 1.5 2.0 3.0 D), excitation mode (X direction, Z XY XYZ direction) on law are studied, respectively. results show that (1)...

The rock slopes with tunnels appear widely in the actual project, but there is no executable basis for seismic stability calculation of slope tunnel. According to upper bound theorem plastic limit analysis and pseudostatic method, solution safety factor tunnel was rigorously derived under earthquake loading. This takes into account design parameters tunnel, horizontal vertical loads, physical mechanical mass. Comparing calculated results existing results, validity proposed method verified....

In order to obtain the seismic dynamic characteristics of a shallow‐bias tunnel with small space, series large‐scale shaking table model tests were carried out. The key technology test is introduced in detail, for example, similar ratios model, equipment, testing box, sensor arrangement, waves, and system. results show that first predominant frequency between measuring points. However, second highly different frequencies gradually decrease increasing input PGA. rock stratum can shield wave...

In order to study the bearing characteristic of geosynthetic-encased stone column (GESC) on composite foundation, a series field tests and numerical simulation were carried out foundations reinforced by traditional GESC. The pile–soil stress ratio, excess pore water pressure lateral displacement two kinds monitored. effects geotextile stiffness, wrapping length gravel internal friction angle foundation with GESC analyzed establishing different models. results show that can bear larger...

In order to obtain the seismic dynamic laws of acceleration and displacement a shallow-buried bifurcated tunnel, analysis numerical simulation was carried out by MIDAS-GTS/NX software. The results were verified shaking table model test. show that: (1) test coincide with each other in terms variation law peak value. are credible. (2) For different tunnel cross-section, response significant difference. (3) small distance (Section 6) is intense. difference from type tunnels. measuring point at...

In this paper, we study singular heat flows from a 3-dimensional complete bounded Riemannian manifold without boundary into the hyperbolic space with prescribe singularity along closed curve. We prove existence and regularity of flows. Furthermore, that converge to harmonic map at an exponential rate.

The measurement and control gate, as a new type of equipment, has been widely used for water quantity in irrigation areas. However, there is lack methods calibrating the flow inside box at present. This paper establishes prediction model based on back propagation (BP) neural network its optimization algorithm by using 450 sets sample data obtained from indoor gate overflow test verified effectiveness accuracy another 205 data. results show that BP self-adaptability to different patterns,...

The nonuniform freezing of the sample has a considerable influence on result point test. It is associated with size samples and called "size effect." A novel apparatus based solid-state cooling technology was developed to solve this problem. linear mode "ramped freezing" (RF) proposed replace "constant (CF) provide uniform condition for soil sample. single neuron network used dynamically optimize parameters Proportional-Integral-Derivative algorithm improve performance variable temperature...

In order to analyze the influence of a damping ditch on blasting vibration, large number on-site monitoring tests with or without were carried out based foundation pit excavation project. Based Sadovsky’s empirical formula, optimized vibration velocity attenuation model was established by using waveform subsection correspondence method and least square method. The calculation results are in good agreement measurement results. average errors radial direction vertical 17.04 % 10.76...