This paper presents a cement-content controlled method for quality assessment and control of the deep soil mixing (DSM) columns in slope reinforcement. The ethylene diamine tetraacetic acid (EDTA) titration was modified used cement content measurement core samples, effects curing conditions period on results were investigated. 35 DSM with different construction parameters installed test section, unconfined compression tests field samples conducted. relationship between compressive strength...

In response to the environmental challenges posed by conventional expansive soil stabilization methods, this study investigates low-carbon potential of industrial by-products—cement kiln dust (CKD) and calcium carbide slag (CCS)—as sustainable stabilizers. A comprehensive series laboratory tests, including compaction free swelling rate measurements, unconfined compressive strength (UCS) evaluations, scanning electron microscopy (SEM) analyses, were conducted on samples treated with varying...

A method which adopts the combination of least squares support vector machine (LS-SVM) and Monte Carlo (MC) simulation is used to calculate foundation settlement reliability. When using LS-SVM, choosing training dataset values for LS-SVM parameters key. In a representative sense, orthogonal experimental design with four factors five levels choose inputs dataset, outputs are calculated by fast Lagrangian analysis continua (FLAC). The decimal ant colony algorithm (DACA) also determine...

In order to study deposited sediment settlement and consolidation mechanisms, experiments were conducted using a column. Based on the experimental results, stage definition, excessive pore pressure (EPP) dissipation, constitutive equations are discussed. Three stages, including free settlement, hindered self-weight defined. The results of this show that is mainly affected by initial concentration height, interface rate linearly attenuated with time bilogarithmic scales during stages....

Expansive soil experiences periodic swelling and shrinkage during the alternate wet dry environments, which will result in severe damage to slope stability. In this study, a promising modifier OTAC-KCl is introduced, has good diffusivity soluble water or other solvents easily. Firstly, reasonable combination of ameliorant 0.3% STAC 3% KCl chosen referring free swell test. Then, best curing period, 14 days, gotten from UCS tests. The effect wetting drying cycles on engineering properties...

Tunnel construction is susceptible to accidents such as loosening, deformation, collapse, and water inrush, especially under complex geological conditions like dense fault areas. These can cause instability damage the tunnel. As a result, it essential conduct research on tunnel grouting reinforcement technology in fracture zones address these issues ensure safety of excavation projects. This study utilized Xianglushan cross-fault comprehensive analysis construction, support, crossing zone...

The use of suction caissons can reduce the development costs offshore wind energy and has broad application prospects. However scour around marine foundations is inevitable, it gravely affects stability engineering. Therefore, there an urgent need to study weakening effects on caisson. In this study, variation trends remaining soil parameters (the effective unit weight peak friction angle) after are examined with consideration dilatancy stress history sandy silt. It found that shallow change...

Metal hydrides have been studied extensively due to their intriguing superconductivity and potential hydrogen storage capacities. Here, the structural, electronic, phononic, superconducting properties of iron FeHx (x=1-6) are...

This paper introduces a slurry suspension settlement prediction model for cohesive sediment in still water environment. With no input and environment condition, control forces between settling particles are significantly different the process of sedimentation rate attenuation, includes free stage, log-linear attenuation stable consolidation stage according to attenuation. Settlement equations height time were established based on properties stages. Finally, parameters was set up with...

The feasibility of using water glass and aluminum sulfate to treat high liquid limit soil subgrade diseases is studied through laboratory experiments, the following results were observed. After improving clay with sulfate, decreases, plastic increases, plasticity index decreases. Compared untreated soil, content improved while silt coarse contents increase. absolute relative expansion rates are both lower than those soil. With same number dry wet cycles, decreased degrees cohesion internal...

This paper proposes the use of calcium carbonate (CaCO3) precipitation induced by addition chloride (CaCl2) and sodium (Na2CO3) solutions as a procedure to stabilize improve expansive soil. A set laboratory tests, including free swell test, unloaded swelling ratio unconfined compression direct shear scanning electron microscopy (SEM) cyclic wetting–drying test laboratory-scale model were performed under various curing periods evaluate performance CaCO3 stabilization. It is concluded from...

Since the pull-out response of upwind caissons governs design multi-caisson foundations, it is worthwhile to study scour effect on tensile capacity suction caissons. The after relevant depth and pressure under caisson lid: decreases dramatically with increasing depth; smaller pressure, stronger weakening scour. Moreover, investigated in two cases: ignoring stress history considering history. results show that larger when considered, so leads a conservative design. In order quantitatively...

Laboratory freezing experiments were conducted to evaluate the effect of polyacrylamide (PAM) and lignocellulose on mechanical properties microstructural characteristics Tibetan clay. Direct shear unconfined compressive tests field emission scanning electron microscopy analyses performed clay samples with different contents stabilizers. The test results show that addition PAM can improve strength cohesion clay, but an excessive amount reduces internal friction angle. After several...

Based on the characteristics of an expansive soil slope, slip mass can be simplified to a simpler model with three-broken line rigid bodies. A solution was formulated calculate safety factors and results are similar those based strength reduction method. However, conventional methods analyze stability slopes, deterministic method obtain only calculates factor using values without considering randomness parameters, which leads unstable results. To improve rationality calculated results, this...

The deposition and consolidation behaviour of cohesive sediment is studied with a newly developed integrated settlement column system. This system, which includes graduate (glass) (PMMA), has been proved an effective way to study the suspension 20∼300 g/L initial concentration. Cohesive behaviours are as follows: can be divided into different stages free interface rate. influence factors mainly concentration height, from which, size effect determined by three wall effect, convection well...

At present, in the design of geotechnical structures, allowable bearing capacity is mostly designed according to safety factor specified specification. However, there are two problems that have not yet been clearly explained theory: (1) why listed standard suitable for structures and (2) can selected specification guarantee long-term stability soil mass. In view above problems, statistical law rheological properties soil, relationship between shear stress level studied, stable obtained. The...

In gravel pile composite foundation stability design, the shear strength of is critically important. However, due to size limitation test equipment, it difficult obtain its in field. This study designs a laboratory model foundation, where total four group tests were carried out, including two nature soils and area replacement ratios. The parameters obtained by are compared with results empirical formula methods such as Chinese standard method (CSM) Priebe (PM) verify accuracy these methods....