Various diseases such as lining defects, structural cracking, and water leakage are common in tunnel operation. Therefore, this paper considers the research object of highway with typical namely voids behind lining. The stress distribution crack void were analyzed by numerical simulation based on XFEM, cracking mode was studied model test. According to results:(1) change characteristics lining, structure within is stretched, significantly reducing overall safety structure. Equation(2)(2)...

Highway subgrade bears millions of traffic loads over the years, and its strength, stiffness, long-term stability gradually decline. In this paper, dynamic triaxial tests were carried out to study time evolution spatial distribution strain pore pressure highway-subgrade soil under action load. The influence load on deformation was analyzed. Furthermore, a numerical-calculation model established. characteristics driving main conclusions can be drawn as follows: (1) With increase in loading...

The pavement surface will inevitably develop cracks, subsidence, pits, ruts, and other defects due to the effects of traffic environment. In road engineering, vibration-based condition monitoring has been widely adopted. Due differences in vehicle dynamics, acquisition equipment, quality, application these techniques identification minor damage is limited. With widespread adoption inertial navigation system (INS) autonomous vehicles, INS-based evaluation emerged as a promising new technique....

Ground-penetrating radar (GPR) is a mainstream tool to detect defects behind tunnel linings, but the difficulty in interpreting GPR signals limits its application. This paper proposes an intelligent way differentiate linings by means of model test and feature parameter analysis, achieve efficient accurate analysis signals. The reveals differences between defect non-defect data amplitude, signal entropy, standard deviation, other parameters. amplitude was on average six times as large that...

The most common structural defect of a tunnel in the operation period is cracking concrete lining. insufficient thickness lining one main reasons for its cracking. This study studied behavior standard specimens and failure structures caused by using Cohesive Zone Model (CZM). Firstly, zero-thickness cohesive elements were globally inserted between solid specimen model, crack development process different grades was compared. On this basis, three-dimensional numerical model established....

Diffusion radius is an important construction parameter, because it can significantly influence the grouting effectiveness. Theoretical models in predicting diffusion have been practiced, but there are still significant discrepancies between theoretical calculations and realistic results practical construction. One of critical reasons for misprediction time-dependent behavior cement grout, which affected by water-cement ratio (W/C). Therefore, this paper experimentally numerically studies...

Highway widening has become an effective way to improve the carrying capacity of existing expressways. However, assume that differential settlement between new and old subgrades is not controlled. In case, it will lead longitudinal cracks on pavement, which seriously affect safety vehicles. this study, variations elastic modulus dynamic under traffic load were studied by tests. A hyperbolic model increasing with strain proposed. The numerical calculation established. deformation...

Abstract In the highway widening project, it is of great importance to take measures control differential settlement between new and old embankment, therefore improving stability embankment. This article presents a series model tests analyze failure law embankment compare reinforcement effects different technologies. The test results show that unstable because slope slippage under ultimate load. gravel pile, reaming phenomenon occurred at top both values in pavement lateral deformation are...

In highway tunnels, the presence of a cavity behind lining can affect contact between and surrounding rock, leading to concentration pressure from rock acceleration cracking in tunnel structure. Thus, such cavities pose significant safety hazards. However, due complexity interaction it is challenging clarify mechanism damage caused by cavity. this study, we developed mechanical model for testing linings tunnels conducted numerical simulations bearing capacity cavities. The results showed...

In the dredging of Yellow River, a common practice involves extracting alluvial fill from river and depositing it on rear side embankment, serving dual purpose reinforcing embankment. Nevertheless, there are few studies consolidation extracted River. this paper, laboratory experiments were conducted to examine change in hydraulic conductivity during process fill. Besides, numerical model was established investigate dissipation law excess pore water pressure settlement layered According...

The expansion of structural cracks significantly threatens the safety service-reinforced concrete structures. By studying load-bearing performance reinforced under different crack development states, state structures can be quantitatively analyzed to provide an essential reference for stability analysis in service. Based on characteristics apparent concrete, this study systematically investigated influence with lengths, orientations, and depths. It establishes formulae calculating single...

In highway tunnels, the presence of a cavity behind lining can affect contact between and surrounding rock, leading to concentration pressure from rock acceleration cracking in tunnel structure. Thus, such cavities pose significant safety hazards. However, due complexity interaction it is challenging clarify mechanism damage caused by cavity. this study, we developed mechanical model for testing linings tunnels conducted numerical simulations bearing capacity cavities. The results showed...

The present invention provides a point cloud spacing extraction algorithm for tunnel steel arch frames.This method first calculates the angle between of construction section and adjacent coordinate axis rotates it so that its axial direction is parallel to axis.Then, normal vector calculated, threshold set based on calculated extract cloud.Then, clustering used single cloud, Use C2C-Distance kd tree calculate closest distance from each in another arch.Take average value obtain arches, fit...

Abstract In the embankment widening project, new will produce large deformation due to low degree of consolidation, which affect stability embankment. Obtaining settlement law is premise ensure this paper, studied through model test, and calculation method proposed. The test results show that old embankments have a difference during loading process, maximum twice lateral directly proportional vertical deformation, sliding occurs under ultimate load, bearing capacity lost. Based on...