This paper presents a negative stiffness magnetic suspension vibration isolator (NSMSVI) using spring and rubber ligaments. The positive is obtained by repulsive while the gained In order to study isolation performance of NSMSVI, an analytical expression vertical stretch force ligament constructed. Experiments are carried out, which demonstrates that effective. Then deduced derivative with respect displacement inner ring. Furthermore, parametric out. As case study, size dimensions...

Deep foundations may need to resist torsional loads, resulting from wind loading on traffic sign and signal pole structures, or seismic curved skewed bridges. Although design methods for deep at the ultimate limit states are readily available, no significant effort exists quantify accuracy of existing load transfer–based torsion-rotation predict full-scale, in-service rotation performance that considers state-dependence soil. To facilitate serviceability state geometrically variable...

A new adhesive strength test (AST) was developed to determine the of joint sealant. series sealant thicknesses, displacement rates, and curing times tested proper AST testing parameters using self-leveling (SL) non-self-leveling (NS) silicone sealants. tests conducted under varying moisture conditions. The results appeared indicate that may reduce strength. Drying-time were approximate appropriate wait time between washing installation for 3.2 mm (1/8 in.) 9.5 (3/8 joints. also on...

Increased seismic flexural demands on drilled shaft foundations have led to significant increases in the amount of steel reinforcement, leading a greater number and/or larger sized bars and increased possibility anomalies within shafts due reduced apertures between reinforcement for concrete passage. High-strength permanent casing may be used provide structural resistance addition mitigating concern voids or other potential anomalies. However, comparison lateral load transfer characteristics...

Liquefaction has been commonly observed in past major earthquakes across the world and caused extensive damages to built infrastructure. A substantial portion of these ground failures structural was direct results or related lateral spread. Lateral spread is particularly damaging if a non-liquefiable crust rides on top liquefied soil. When frozen, its physical properties including stiffness, shear strength permeability will change substantially. What would be impact bridge pile foundation...

The effect of lime‐sand ratio and slurry concentration on the mechanical properties backfills is important. To achieve green high‐efficiency mining, accurately determining optimum cemented tailings for certain tungsten ensuring safety stability mine stope structure are cement‐sand ratios used in this research were 1 : 6 8. evaluated by using 68%, 72%, 78% tailing filling materials. corresponding physical parameters obtained through uniaxial compression, splitting, shearing experiments...

Because of simple construction, short duration, and less investment, CFG pile composite foundation is applied widely in reinforcing soft soil roadbed highspeed railway construction China at present. The technique quality control method with the length more than 28m are described detail through example a typical section Wuhan-Guangzhou passenger special line. Based on on-site pore water pressure monitoring, mechanism influence factors environment problems long spiral known solution methods...

In order to provide adequate support the surface layer of airfield pavement, base, subbase and subgrade must be compacted high density. Generally, pavement materials are by roller in longitudinal direction. It may cause property variance between transverse directions. Portable Seismic Pavement Analyzer for Soils (D-PSPA) was used evaluate effect rolling direction on unbound material modulus. A series D-PSPA tests were conducted subgrade, base at National Airport Test Facility (NAPTF) both...

Monopiles are the most common foundation form of offshore wind turbines, which bear vertical load, lateral load and bending moment. It remains uncertain whether applied increases deflection pile. This paper investigated influence on behaviour monopiles installed in sand under combined using three-dimensional numerical methods. The commercial software PLAXIS was used for simulations this paper. were modelled as a structure incorporating linear elastic material soil Hardening-Soil (HS)...

Failure mechanism of short fiber-reinforced cement-stabilized soil depends on the interaction between fiber and matrix. And reinforcement is revealed by experimental studies numerical simulations. Firstly, using single pull-out test, results show that maximum tensile force under different embedding lengths increases with development age. Then based a cohesive model, three-dimensional finite element model established to simulate soil. The comparisons reflect viscous interface parameters have...

The offshore wind turbine three-bucket jacket foundation (TBJF) bears some complex force at the stage of lowering though splash zone, and two nonlinear phenomena appear in bucket foundation: air cushion structure is formed generates a slamming on roof. This paper point phenomena, model tests research installation TBJF are carried out. effects waves control conditions response, variation law sling tension dynamic characteristics investigated. Moreover, calculation formula pressure during...

The cemented tailings backfill (CTB) mining method is increasingly used in underground mines where its stability susceptible to dynamic loading from excavation or blasting. In this study, we investigate average strain rate (ASR) and particle size distribution of aggregate effects on mechanical properties fragmentation mechanism backfill, which the gradations particles satisfy Talbot gradation theory. characteristic stress-strain curves, peak compression strength (DPCS), energy variations,...

The p–y method for analysis of the lateral load transfer deep foundations has been widely accepted in geotechnical profession. However, models typically used are often based on one or several full-scale, instrumented loading tests a specific soil deposit and may not be appropriate other deposits that exhibit differences fabric, stress history, geological deposition. Cost-effective application to design given region should leverage high-quality data derived from interest. This paper presents...

This paper mainly uses the method of model test to study ultimate uplift bearing characteristics a single pile with different length-to-diameter ratios, from distribution laws capacity pile, axial force and side friction perform analysis. The is made PVC pipe, resistance strain gauges are attached both sides pipe. value pipe under load conditions measured obtain working behavior during process pulling out pile. result shows that data in good agreement numerical simulation.