The Experts below are selected from a list of 1014 Experts worldwide ranked by ideXlab platform
Weiming Gong - One of the best experts on this subject based on the ideXlab platform.
-
analytical method for laterally loaded piles in soft clay considering the influence of soil outside the scour hole on the Effective Overburden Pressure
Acta Geotechnica, 2021Co-Authors: Fan Zhang, Guoliang Dai, Weiming GongAbstract:Scour reduces the Effective Overburden Pressure and the undrained shear strength of soil, thus affecting the lateral load-bearing capacity of pile foundations. Compared with general scour, local scour can decrease the reduction of the Effective Overburden Pressure and the undrained shear strength around the pile due to the existence of soil outside the scour hole. To fully reflect the actual situation at a site, the behavior of laterally loaded piles in soft clay should consider both the scour-hole dimensions and the soil stress history. This paper proposes a closed-form analytical solution for laterally loaded piles in soft clay that can simultaneously account for the changes in Effective Overburden Pressure and undrained shear strength caused by the scour-hole dimensions and the soil stress history based on the p–y curve proposed by Matlock. The average reduced stress is introduced according to Boussinesq’s point load solution. Case studies demonstrate that the analytical method is reliable with reasonable accuracy. According to the parameter study, the load eccentricity is the most sensitive factor compared with the changes in soil properties caused by the scour-hole dimensions and the soil stress history.
Fan Zhang - One of the best experts on this subject based on the ideXlab platform.
-
analytical method for laterally loaded piles in soft clay considering the influence of soil outside the scour hole on the Effective Overburden Pressure
Acta Geotechnica, 2021Co-Authors: Fan Zhang, Guoliang Dai, Weiming GongAbstract:Scour reduces the Effective Overburden Pressure and the undrained shear strength of soil, thus affecting the lateral load-bearing capacity of pile foundations. Compared with general scour, local scour can decrease the reduction of the Effective Overburden Pressure and the undrained shear strength around the pile due to the existence of soil outside the scour hole. To fully reflect the actual situation at a site, the behavior of laterally loaded piles in soft clay should consider both the scour-hole dimensions and the soil stress history. This paper proposes a closed-form analytical solution for laterally loaded piles in soft clay that can simultaneously account for the changes in Effective Overburden Pressure and undrained shear strength caused by the scour-hole dimensions and the soil stress history based on the p–y curve proposed by Matlock. The average reduced stress is introduced according to Boussinesq’s point load solution. Case studies demonstrate that the analytical method is reliable with reasonable accuracy. According to the parameter study, the load eccentricity is the most sensitive factor compared with the changes in soil properties caused by the scour-hole dimensions and the soil stress history.
Takaharu Shogaki - One of the best experts on this subject based on the ideXlab platform.
-
A METHOD FOR CORRECTING CONSOLIDATION PARAMETERS FOR SAMPLE DISTURBANCE USING VOLUMETRIC STRAIN
Soils and Foundations, 1996Co-Authors: Takaharu ShogakiAbstract:Sample disturbance was investigated in terms of the volumetric strain of an oedometer specimen, eυο, at in-situ Effective Overburden Pressure, σ'υο, determined from the 24-hour e-log σ'υ curve. Unconfined compression and oedometer tests were performed on samples of natural deposits from ten different sites in Japan. The eυο value has a unique correlation with the plasticity index, Ip, σ'υο, overconsolidation ratio, OCR, and degree of sample disturbance. The eυο values of the in-situ sample before intentional disturbance in the laboratory were in the range of 0.85% to 7.02%, and the average was 3.80%. The eυο values of the completely remolded sample were in the range of 7.52% to 23.07% and the average was 15.75%. The eυο value, resulting from intentional sample disturbance in the laboratory, is given as a function of the ratio of unconfined compressive strength, qu, of sample disturbed in the laboratory to that of the in-situ sample. A procedure for obtaining values of strength and consolidation parameters of an in-situ soil, and a method for estimating the preconsolidation Pressure, σ'p, compression index, Cc, e-log σ'υ curve, and coefficient of consolidation, cυ, values for the in-situ soil are proposed from the Ip and the measured values of eυο, σ'p, Cc, and cυ for disturbed samples in the standard oedometer test.
Guoliang Dai - One of the best experts on this subject based on the ideXlab platform.
-
analytical method for laterally loaded piles in soft clay considering the influence of soil outside the scour hole on the Effective Overburden Pressure
Acta Geotechnica, 2021Co-Authors: Fan Zhang, Guoliang Dai, Weiming GongAbstract:Scour reduces the Effective Overburden Pressure and the undrained shear strength of soil, thus affecting the lateral load-bearing capacity of pile foundations. Compared with general scour, local scour can decrease the reduction of the Effective Overburden Pressure and the undrained shear strength around the pile due to the existence of soil outside the scour hole. To fully reflect the actual situation at a site, the behavior of laterally loaded piles in soft clay should consider both the scour-hole dimensions and the soil stress history. This paper proposes a closed-form analytical solution for laterally loaded piles in soft clay that can simultaneously account for the changes in Effective Overburden Pressure and undrained shear strength caused by the scour-hole dimensions and the soil stress history based on the p–y curve proposed by Matlock. The average reduced stress is introduced according to Boussinesq’s point load solution. Case studies demonstrate that the analytical method is reliable with reasonable accuracy. According to the parameter study, the load eccentricity is the most sensitive factor compared with the changes in soil properties caused by the scour-hole dimensions and the soil stress history.
Masanori Tanaka - One of the best experts on this subject based on the ideXlab platform.
-
main factors governing residual Effective stress for cohesive soils sampled by tube sampling
Soils and Foundations, 2006Co-Authors: Hiroyuki Tanaka, Masanori TanakaAbstract:The residual Effective stress (p'r) was measured for various clayey soils collected from various parts of the world, including Japan. All samples studied in this paper were retrieved by the same sampling method, i.e., using the Japanese standard sampler. However, measured p'r/σ'vo, where σ'vo is the in situ Effective Overburden Pressure, considerably varied for different sites as well as with depth. This paper examines main factors governing the p'r value, focusing on location of the sample in the sampling tube; transportation of the soil samples; time duration between retrieval of the sample and extrusion of the sample from the sampling tube; overconsolidation ratio (OCR); clay content and plasticity index (Ip). In addition, the p'r values are correlated to the volume change generated when the in situ σ'vo is applied in the oedometer test, which is extensively used for assessment of the sample quality. The largest measured value of p'r was found at one third of the sample length from the cutting edge of the sampling tube. The effects of the transportation and the time duration from the sampling to the extrusion of the sample are not prominent for the p'r value. Any clear relations between p'r and Δe/eo are not found, where Δe and eo are the void ratio change caused by applying σ'vo and the initial void ratio, respectively. Among factors examined in this paper, OCR is the most Effective factor: i.e., as OCR increases, p'r/σ'vo ratio increases for every studied site. However, when compared at different sites, the p'r/σ'vo ratio at the same OCR is considerably different. In spite of some exceptions, there exists a tendency that p'r/σ'vo ratio increases with the increase in the clay content as well as Ip.
