The Global Navigation Satellite System (GNSS), renowned for its high precision and automation, has shone brightly in the deformation monitoring of offshore facilities sea-crossing bridges. However, antennas placed these locations are often subject to signal interference from various reflective surfaces, such as rivers oceans, which significantly compromises observation accuracy reliability. Synthesizing previous research, we first propose a method multipath dataset construction, involves...

Non-Hermitian systems and their topological singularities, such as exceptional points (EPs), lines, surfaces, have recently attracted intense interest. The investigation of these constituents has led to fruitful applications. responsivity the eigenvalue diverges at EPs, chiral state transfer occurs when encircling an EP. Traditionally, it was believed that features were unique non-Hermitian requiring gain, loss, or nonreciprocal hopping. Here, we show are also present in nonlinear Hermitian...

Using finite element software, the analysis model of semi-rigid base pavement with voids is established. Variation deflection under load Falling Weight Deflectometer (FWD) studied and reference critical value obtained to determine whether there are voids. According basin data different location, identification method for void location The field test shows that it feasible use this technology in pavement.

Aiming at collapse in the excavation of tunnel western Henan, measures including cement grouting and leading conduit are proposed to be used treatment collapse, processes is numerical simulated. Comprehensive analysis shows that broken surrounding rock strength has been improved significantly, it worked fine after being treated.

As a nondestructive testing technology, GPR has been become one of the most important tools in quality inspection tunnel lining at present. It is widely applied to disease detection, such as holes, cracks, voids between and surrounding rock, it also used determine steel arch distribution thickness tunnel. Through application highway response characteristics reinforced bar frame are analyzed on radar maps under different frequencies radar. identifying abnormal reflection interpreting its...

Aiming at the problem that asphalt pavement is prone to early crack and reduces its service life, response of transverse longitudinal surface vertical cracks under moving loads studied based on fracture mechanics theory. By means 3D numerical simulation with general finite element software package ABAQUS, change law stress intensity factor kⅡ vehicle load are deeply analyzed some conclusions drawn, which contribute further research propagation behavior in condition, will provide guidance for...

Five wells of L oilfield in Bohai bay basin have drilled 10 - 15 meters thick oil layer the Paleogene delta. Due to deep-buried reservoir and poor seismic performance, it is difficult identify genesis, predict distribution. By analyzing core, well logging data, a stable mudstone section selected as correlation marker establish stratigraphic framework. The paleogeomorphology reconstructed after decompaction correction paleobathymetric analysis. Based on differences paleotopography sedimentary...

Two-dimension finite difference time domain (FDTD) update equations are established, and the GPR electromagnetic wave propagation in rigid pavement with voids beneath slabs is numerical simulated by using effective CPML boundary conditions, then two-Dimension images for slab obtained. Moreover, relationship between characteristics of data analyzed. The achievements this paper will provide a theoretical basis use to rapidly detect slab.

Inverse analysis is regarded as an ideal way to achieve the mechanical parameters of rock mass using in situ measured deformation data surrounding during construction underground engineering. Aiming at disadvantage high computational complexity when identifying by employing inverse method based on standard support vector machine (Vapnik’s SVM), a new back least squares (LS-SVM) was presented. The basic principle introduced. An example adopted investigate practicality and reliability method,...

The size of voids beneath rigid pavement slabs is an important factor which influences the bearing capacity roads. GPR advanced method for detecting slabs. Combined with drilling and sampling, equations including parameters wave amplitude, horizontal vertical are established analyzing voids. Then, based on equations, can be calculated according to actual amplitude.

A nonconforming mixed finite element method for nonlinear hyperbolic equations is discussed. Existence and uniqueness of the solution to discrete problem are proved. Priori estimates optimal order derived both displacement stress.

Based on prototype monitoring, deformation of a hydropower plant is analyzed in two aspects, horizontal displacement and vertical displacement. The results analysis show that monitoring quantity mainly affected by temperature change, while change water level does not have much effect dam deformation. Small large distributes both sides river bed respectively. In general, the small makes safety, but it should be noted right head has tendency toward bed.