The over consolidation ratio (OCR) is a critical parameter representing the stress history of soft soils, and its accurate prediction essential for settlement analysis geotechnical engineering design. This study employs extensive testing using seismic piezocone penetration (SCPTU) combined with laboratory tests samples from in-situ test points to investigate correlation between SCPTU parameters, physical parameters OCR soils. Johnson distribution method was applied normalization parameters....

Understanding multiphase transformations and the migration of heat, water, vapor, salt in coarse-grained saline soil under groundwater recharge environmental freeze—thaw cycles is crucial for ensuring stability highway infrastructures. To clarify patterns soil, as well salt-insulating effect aggregate insulating layer, an experimental study was conducted a column model pressureless water replenishment with fluorescein-labeled liquid cycles. The results showed that temperature columns...

The uneven settlement of the surrounding ground surface caused by subway construction is not only complicated but also liable to cause casualties and property damage, so a timely understanding deformation in excavation its prediction real time practical significance. Due complex nonlinear relationship between numerous influencing factors, as well existence lag effect influence various factors process, performance accuracy traditional methods can no longer meet industry demands. Therefore,...

The evolution of toppling deformation anti-dip slope is essentially a process energy dissipation and transformation. Aiming to study the characteristics in different stages, DEM (discrete element method) software PFC (Particle Flow Code) was utilized establish two-dimensional numerical model for bank Chongqing based on geological background data field investigation. proven be reliable not only because discrepancy between actual large but also some obvious fractures can readily found as well....

Abstract In order to explore the influence of weak interlayer on blasting characteristics in natural rock mass, by using particle flow code (PFC 2D ), a single hole numerical model hard with soft is established. The experiments at different positions and thicknesses are carried out. Then an in-depth analysis from perspectives crack effect, stress field energy made. Results showed that: (i) When explosion initiated outside interlayer, if located within about twice radius crushing area, closer...

The existence of the interface between soft and hard rock often makes it difficult to control blasting effect. Studying influence structural plane delayed initiation time on characteristics can make effect more controllable. In this paper, by using Particle Flow Code (PFC 2D ) particle expansion algorithm, double-hole experiments soft-hard are carried out, results analyzed from perspectives fragment gradation, micro contact force energy field. Results show that: 1) When in rock, if distance...

By researching the distance between blasthole and interface of soft-hard rock strata, as well time delay detonation, blasting effect mass will be more controllable. Firstly, validity numerical method was authenticated from three angles: coupled stress field, ratio crushing zone radius to radius, crack network state. Under condition model double-hole established by using PFC2D. Then experiments were carried out under different relative positions interface. Ultimately, results analyzed...

The mechanical properties of deep rock masses are significantly influenced by temperature and other factors. effect on the strength will pose a serious challenge to resource exploitation engineering construction. In this paper, thermal-mechanical coupling calculation model is established particle flow code (PFC 2D ) study uniaxial compression response with microcracks after load. failure, microcracks, strain was analyzed. results show that: (i) When soft thickness ratio Hs/H < 0.5,...

The existence of various types damage, small cracks, some large voids and the size sample in rock will make experimental results show great discreteness. In this paper, based on laboratory experiments, a numerical model flawed samples is established by using particle flow software PFC2D, mechanical response rocks with different length-diameter ratios flaw positions uniaxial compression experiments discussed. that specimen has significant effect crack characteristics, characteristics energy...

Examining the environmental risk sources of regional subway construction is crucial for ensuring safety and providing guidance future line planning. This study focused on Urumqi’s main urban area used SBAS-InSAR analysis technology to extract settlement rate field within 600 m Urumqi Metro Line 1 investigate these sources. Results showed that affecting in could be classified into four categories: geological conditions, distribution high-rise buildings, density road networks, clustered...

More and more underwater-related geotechnical problems have arisen, but there is little research about the instability process of submerged anti-dip slopes. This study built CFD–DEM coupling method based on CFD solver OpenFOAM DEM PFC. The Ergun test was selected as benchmark to verify accuracy method, pressure drop predicted from agreed well with analytic solution. Then, we a numerically slope model, special effort made its characteristic. flow water will weaken stability, birth cracks be...

Earth pressure coefficient at rest K0 is commonly estimated by empirical equations, which to date has had insufficient accuracy and universality. For better prediction, the investigation on factors influencing required. A series of discrete element method (DEM) simulations oedometer tests are conducted verify key granular materials. The influences initial fabric anisotropy, particle shape, void ratio, inter-particle friction angle investigated. evolution microstructure monitored during...

Complex geological conditions often make the blasting effect difficult to control. In order explore influence of soft-hard rock strata on characteristics, based PFC2D software, combined with particle expansion loading algorithm, numerical simulation experiments are carried out. Firstly, rationality method is verified by single-hole sandstone experiment. Then, composite established, and strata, different distribution thickness soft stratum hard stratum, The experimental results analyzed from...

In complex high in-situ stress conditions, how to achieve the ideal rock blasting effect through effective methods is often a difficult point of operations. This paper analyzes influence guide holes on by adding pre-treatment method. Based particle expansion method carry out double-hole experiments, blasthole spacing and ground investigated from levels macroscopic cracking effect, microscopic contact so on. The study shows that: (i) setting empty between gun can enhance crack penetration...

Abstract With the development of hydraulic engineering, more hydropower stations are built in complex geological condition. This work proposed a case study on stilling basin fractured dam foundation using 3D nonlinear analysis. A detail implementation numerical mesh generation from profile to solid geometry boundary representation (B-Rep) is illustrated. Considering main factors like self-weight, hydrodynamic pressure, and uplift stress deformation results obtained. According calculation...

The issue of uneven ground settlement caused by the excavation subway tunnels represents a significant challenge in design and construction projects. This paper examined fractal characteristics surface excavation, employing wavelet transform theory. Firstly, noise reduction effects different functions, decomposition levels, threshold selection rules were evaluated using SNR RMSE. Subsequently, 291 data points derived from 18 interpolation through interpolation, representing utilization only...