Jintai Wang

• Ph.D
• Assitant Professor at Oregon Institute of Technology

The cast-in-place (CIP) pile is a type of deep foundation that has been widely used in various soils. However, the performance of CIP pile in dynamically compacted (DC) soil-rock mixtures has been rarely investigated. This study presents a field investigation on the performance of CIP piles in DC treated soil-rock mixtures. First, a 30-meter-thick...

The increasing interest in studying diatomaceous earth stems from the challenges posed by their presence in various engineering projects, such as the US 97 at Wickiup Junction project in Oregon. Diatomaceous earth consists of fossilized remains of diatoms, which have a highly varied and interlocking shape, giving the impression of strength until th...

The increasing interest in studying diatomaceous earth stems from the challenges posed by their presence in various engineering projects, such as the US 97 at Wickiup Junction project in Oregon. Diatomaceous earth consists of fossilized remains of diatoms, which have a highly varied and interlocking shape, giving the impression of strength until th...

First-year engineering students from a variety of disciplines participated in a research project to improve the firmness and stability of a local trail using ash from the Mt. Mazama volcanic eruption. Previous work had shown success in applying a Mazama Ash treatment to small test patches, so this work aimed to implement the surface treatment at a...

Dynamic compaction (DC) is an efficient ground treatment technique that has been widely used for different soil types, however, the investigation on performance of high energy level DC for soil-rock mixture backfills is rare so far. This study presents a field investigation of the effectiveness of DC with a maximum energy level of 10,000-kN⋅m on so...

This study presents an ultimate bearing capacity formulation of strip foundations in unsaturated soils within the framework of the Meyerhof theory. The flowchart of calculation steps for this formulation is provided with a trial method according to suction distributions. The validity of the formulation obtained is demonstrated by two available theo...

The reasonable determination of ultimate bearing capacity is crucial to an optimal design of shallow foundations. Soils surrounding shallow foundations are commonly located above the water table and are thus in an unsaturated state. The intermediate principal stress has an improving effect on the unsaturated soil strength. In this study, the ultima...

Excavator-mounted hydraulic plate compactors have been widely used in utility trench backfill compaction due to their efficiency. However, there are industry concerns on the possibility of pipe damage due to the combination of static downward earth pressure exerted by the excavator arm and dynamic earth pressure induced by the excavator-mounted hyd...

The stratification, behavior, and liquefaction resistance of the shallow deposit of FCR was studied using shake table test and piezocone penetration test (CPTu). The CPTu test was conducted at the end of self-consolidation to assess the FCR profile in terms of strength and homogeneity. The shallow deposit of FCR was then tested under a sinusoidal s...

This paper presents a study of the effects of shaking history on liquefaction and cone penetration resistance of a clean sand by using 1-g shake table and piezo-cone penetration test (CPTu). A uniform liquefiable clean sand specimen was air-pluviated and saturated in a large laminar shear box. The sand specimen was subjected to four shaking events....

The liquefaction resistance of postliquefaction sand is time-dependent and still largely unknown. In this paper, the time-dependent liquefaction resistance of a postliquefaction sand deposit is studied using 1-g shake table experimental modeling and piezocone penetration testing (CPTu). A uniform liquefiable sand deposit was air-pluviated and fully...

Fine coal refuse (FCR) is the waste produced in mining process. FCR can be classified as low-plasticity to non-plastic sandy silt or silty sand. Although FCR consists of appreciable amount of fines content (30% to 60%), there is a high liquefaction potential for hydraulically deposited FCR in impoundments due to its loose and saturated structure as...

Previous research shows that shaking history affects the liquefaction resistance of the soil. A strong shaking event could reduce the soil liquefaction resistance due to increased anisotropy of soil. However, a mild shaking with partial or no liquefaction could greatly increase the liquefaction resistance. In this paper, the effect of shaking histo...

Earthquake-induced liquefaction is a cause of substantial damage to geotechnical structures. The examples of liquefaction-induced damage include slope failures, foundation failures and flotation of buried structures. Underground structures embedded at shallow depths such as large underground parking garages, pipelines and manholes, can suffer signi...

Excavator-mounted hydraulic plate compactors are widely used in utility trench backfill compaction due to their efficiency. However, there are industry concerns about the possibility of pipe damage due to the combination of static downward earth pressure exerted by the excavator arm and dynamic earth pressure induced by the excavator-mounted hydrau...

The multi-piped freezing method is usually applied in artificial ground freezing (AGF) projects to fulfill special construction requirements, such as two-, three-, or four-piped freezing. Based on potential superposition theory, this paper gives analytical solutions to steady-state frozen temperature for two, three, and four freezing pipes with dif...

This paper presents a reduced-scale shake table test on the seismic responses of a section of soil-cement-bentonite (SCB) slurry cutoff wall. The geometric scale of slurry wall width was chosen as 1:3 (model:prototype). A section of a slurry wall with dimensions of 150 cm long, 20 cm wide, and 160 cm tall was constructed and tested on a one-dimensi...

An accident involving the collapse of a running tunnel along the Nanjing Metro (Jiangsu Province, P. R. China) occurred as the tunneling shield arrived at the receiving shaft. The brine freezing method was used for the recovery of the collapsed tunnel. During the recovery project, another collapse resulting in the leakage of water and sand occurred...

In a power plant, two shield tunnels were constructed for circulating cooling water under the Yangtze River. During the construction of one line, a collapse occurred because of the abundance of methane in ground. Artificial ground freezing (AGF) was adopted to recover the collapsed tunnel. A working platform was built above the river to facilitate...

Three different kinds of artificially frozen soils are tested for artificial ground freezing (AGF) project in the tunnel construction of Stonecutters Island Sewage Treatment Works, Hong Kong. Uniaxial compressive test is conducted and uniaxial compressive strength, modulus of elasticity and Poisson’s ratio are obtained. Meanwhile, relations of all...

Three kinds of frozen soils were tested for artificial ground freezing (AGF) project in the tunnel construction of Stonecutters Island Sewage Treatment Works, Hong Kong. Triaxial shear test was conducted to obtain shear strength of frozen soils. From the test, Mohr circles and their envelopes were obtained. According to Mohr circles, shear strength...

The artificial ground freezing (AGF) is now widely employed in constructions with the expanding underground space exploitation in Shanghai. In order to avoid geological disasters which might appear in the AGF practice, it is urgently needed to do laboratory tests on the physical and mechanical characters of Shanghai soft soil under freezing and tha...

Qiongzhou strait cross-sea project has attracted a lot of attention. of all the plans discussed, the tunnel scheme is a potential one. Because of the long distance and great depth, Qiongzhou strait tunnel has many engineering problems. AGF (artificial ground freezing) has been widely used in many tunnels as a ground strengthening method. The feasib...