Microbial-induced calcite precipitation (MICP) is one of the environmentally friendly ways to improve engineering properties sandy soil. A laboratory study was conducted investigate effect randomly distributed discrete fiber on mechanical MICP-treated soil and discover corresponding mechanisms. Specimens were prepared at four different ratios (0.1, 0.2, 0.3, 0.4% by weight sand). MICP catalyzed Sporosarcina pasteurii concentration 4.3×107 cells/mL. sand samples using full-contact flexible...

Microbially induced calcite precipitation (MICP) is a sustainable biological ground improvement technology that capable of improving the engineering properties soil. A laboratory study was conducted to investigate influence some key environmental parameters on long-term performance MICP-treated sandy soil, including wet-dry cycles, freeze-thaw and acid rain conditions, effect enhancement through fiber reinforcement multiple MICP treatments. Experimental results indicated durability soil weak...

Most microbially induced calcite precipitation (MICP) processes are by aerobic bacteria; thus, oxygen availability plays an important role in MICP treatment. To determine the effects of supply on treatment catalyzed Sporosarcina pasteurii, contrast tests under aerated condition, air-restricted and open air condition were conducted. The results showed that dissolved (DO) reactor decreased with time was almost exhausted within 7 days; DO box 50% after days because superficial supply;...

Microbially induced calcite precipitation (MICP) using ureolytic bacteria has been investigated to improve the engineering properties of soil. Urease, produced by bacteria, can hydrolyse urea drive biogeochemical reaction in MICP. The goal this study was use changes electrical conductivity (EC) and pH values from hydrolysis test as an indicator monitor activities before MICP process maintain a consistent treatment. Laboratory experiments were conducted establish relationship between EC...

As an environmentally friendly technology, microbially induced calcite precipitation (MICP) is widely used to improve the engineering properties of soil. The goal this study was investigate effect rainfall‐induced erosion on stability sandy slopes which were treated by MICP technology. observation pattern low concentration (0.25 M Ca) and high (0.5 MICP‐treated slopes, mechanical behaviors cement‐treated samples, effects roughness 0.5 Ca 10% slope studied through visual observation,...

Plant urease has the advantages of high activity and small size in enzyme-induced calcium carbonate precipitation (EICP). However, there area lack nucleation sites for EICP. Sucrose sorbitol, which are readily available inexpensive, have potential to provide EICP as nucleating agents. To explore effects two agents on EICP, productivity carbonate, unconfined compressive strength (UCS) microscopic mechanisms were tested. It is found that can be increased much 5.1% by addition sorbitol with an...

Lightweight sand–EPS soil (LSES) is regarded as a kind of sustainable geomaterial for providing way to reutilize fast-growing waste expanded polystyrene (EPS) packages. It usually applied in marine geotechnical engineering solve the excessive settling soft ground or bumps at bridge heads due its merits such low density, high strength, and adjustability. Aiming investigate dynamic shear strength LSES made from sand, series laboratory triaxial experiments was conducted on with different...

The unloading creep behavior of soft soil under lateral stress path and excess pore water pressure is the core problem time‐dependent analysis surrounding rock deformation excavation soil. in Shenzhen, China, was selected this study. triaxial tests different initial pressures (0, 20, 40, 60 kPa) were conducted with K 0 consolidation paths. results show that divided into three stages: attenuation creep, constant velocity accelerated creep. duration failure approximately 5 to 30 mins....

To investigate the mechanical properties of Expanded Polystyrene (EPS) Beads Stabilized Lightweight Soil (EBSLS), Laboratory studies were conducted. Totally 20 sets specimens according to complete test design prepared and tested with unconfined compressive consolidated drained triaxial test. Results showed that dry density EBSLS (0.67-1.62 g/cm3) decreases dramatically increase EPS beads volumetric content, while slightly cement content. Unconfined strength (10-2580 kPa) increases in...

An improved vacuum preloading method combined with a sand sandwich structure (SSS) was developed to facilitate the consolidation of dredged clay-slurry fill and original soft marine clay for land reclamation. In this method, novel is formed as layer introduced on prior placement reclaimed, clay-slurry. This assists in transmitting pressure both clay, through prefabricated vertical drains, little loss, thereby improving efficiency preloading. Field pilot tests were carried out ground without...

Lightweight Clay‐EPS Soil (LCES) is a newly developed material which has many merits such as the adjustability of strength and density, simplicity for construction, economical efficiency. It been widely applied in practical engineering, e.g., soft ground improvement, solvent bridge head jump, earthfill pipeline, broadening highway. Meanwhile, construction castoff industrial waste can be recycled major ingredient LCES. The dynamic deformation characteristics LCES clay were comprehensively...

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