Papers by Author: Guo Cai Wang

Abstract: During the period of building construction on the beach clay, the sludge foundation treatment of large area is the most important issue. The chemical strengthening of silt using curing agent is one of the effective and feasible foundation treatment methods. In order to obtain the physical characteristics of stabilized soil, a great deal of laboratory tests were done to study the strength of stabilized soil which were prepared using beach clay as raw material, cement as curing agent, composite additives as additive agent, and the best ratio for silt is obtained. The microscopic characteristics and curing mechanism of stabilized soil is studied using the microscopic test to analyze the pore structure of stabilized soil. The test results show that the ratio of the curing agent has a positive effect, and can provide fundamental basis for the engineering application of the coastal mud flat silt solidification.

Abstract: Lightweight technology is to transform the discarded materials, such as dredged silt, construction waste soil, waste foam plastics, industrial waste fly ash, waste gypsum, etc., into lightweight soil. This kind of soil has been utilized comprehensively, which can produce good economic benefit, environmental and social benefits. In order to further investigate the properties of mixed lightweight soil, this paper uses indoor test method to study the recycled sludge lightweight soil samples prepared from the construction waste soil by mixing with EPS particles and cement according to certain mass/volume ratio and cured in standard curing conditions. The strength properties and failure mode are analyzed using the direct shear test and unconfined compressive strength test, and the effect of curing period, cement content, EPS particle fraction, etc., on the strength and failure mode is analyzed.

Abstract: Inclined angles of piles and applied loadings have serious effect on the pile’s bearing capacity and settlement. In order to reveal this effect, this paper uses the nonlinear finite element software Adina 8.2 and analyzes the settlement characteristics and the influence factors on the settlement of inclined pile subjected to inclined loadings. From the analysis, it can be seen that: at given pile-soil physical properties, the settlement of inclined angle of the pile is smaller than that of the pile installed vertically subjected to vertical loadings; it is not good for larger inclined angle of inclined pile when the pile subjected to inclined loadings and the pile top settlement is always smallest when the inclined angle of the loadings agrees with that of the pile; The location of the horizontal stress balance point is related to the factors, such as loading value, pile inclined angle, et al., when subjected to vertical loadings. The conclusions obtained can have some reference value for the design and construction of inclined pile that subjected to inclined loadings.

Abstract: In view of the large amounts of discarded sludge produced in the process of engineering construction, this paper proposes and makes use of the discarded sludge and compounds a kind of lightweight soil of adjustable intensity. In order to get the physical properties of the lightweight soil, a series of laboratory tests is made to investigate the lightweight EPS beads compounded soil using the sludge as raw material soil, cement as the solidification material, and the effect of cement content, EPS beads volume fraction and curing age, etc. on the density and strength is analyzed. The change regularity is obtained of the density and strength parameters of lightweight soil using recycled sludge with each factor. The research results can provide fundamental basis for the application and quality control of engineering waste soil, and can establish a theoretical foundation for further development and utilization.

Abstract: A large number of earthquake disasters indicate that the underground structure, such as metro tunnel, is not safe and reliable as people think, and can also be destroyed and collapsed under dynamic load, e.g. earthquake. Therefore, it is necessary to study the seismic response analysis of underground structure in great detail for underground structure under dynamic loading, especially under the earthquake load. Hence, in view of the soft soil of Hangzhou, the 3D non-linear finite element software ADINA is used to study the seismic response of section tunnel of Hangzhou metro line 1, to summarize the earthquake response characteristics of the subway underground structure, and to provide the calculation results of metro tunnel’s seismic response and the change rule of lining deformation and stress. The conclusions obtained can provide some reference values in the seismic design of metro tunnel in soft soil regions.