Parameter Analysis on Hardening Soil Model of Soft Soil for Foundation Pits Based on Shear Rates in Shenzhen Bay, China

Fu, Yiming; He, Siyue; Zhang, Sizhan; Yang, Yong

doi:10.1155/2020/7810918

Cited by 19 publications

(7 citation statements)

References 33 publications

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“…Soil consistency shows the resistance to cohesion or adhesion of soil grains with other objects. This is indicated by the resistance of the soil to forces that will change its character [17,18]. Soil conditions that are often a constraint and are relatively common are the soil that has non-uniform swelling and shrinkage properties as well as fairly high soil plasticity.…”

Section: Resultsmentioning

confidence: 99%

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

et al. 2021

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Soft clay has a relatively low subgrade bearing capacity. The aim is to obtain physical values, mineralogy, mechanical strength values, values for reduction. The research method used is preloading in a test tube measuring 50×70×150 cm. Each cycle of preloading and thermal induction used a fixed load of 0.015 kg/cm². Thermal induction is given vertically and obliquely with temperature variations of 100, 200, 300, and 400 °C. The main observation point is a distance of 15 cm from the center of the induction. At 400 °C inclined induction, the water content is 17.36% (from the initial water content of 59.07%), the soil cohesion is 21.75. kN/m², the value of unconfined compressive strength is 67.72 kN/m², the highest modulus of elasticity is 4593 kN/m2, and the decrease is 5.13 cm. XRD, SEM, EDS results before heating showed mineralogy 0 (65.06%), Ca (13.30%), Na (3.64%), Mg (2.15%), Al (6.63%), Si (8.52%), Sn (0.70%) and did not change significantly after heating at 400 °C. The results after heating included 0 (58.39%), Ca (14.09%), Na (0.72%), Mg (1.16%), Al (6.63%), Si (14.72%), Sn (2.54%). The novelty obtained is to change very soft conditions became medium conditions. Doi: 10.28991/cej-2021-03091705 Full Text: PDF

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Section: Resultsmentioning

confidence: 99%

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

et al. 2021

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“…The stress-strain behavior of soil layers is described by the small strain-hardening model (HSS), which reasonably mimics the nonlinear characteristics and unloading behavior of the soil and has been proven to be applicable [35,36]. The values of the relevant parameters were derived from practical engineering reports based on the constant parameter value method proposed by [37] and others. The HSS model contained 13 parameters, as listed in Table 1.…”

Section: Constitutive Model and Parametersmentioning

confidence: 99%

Limit Equilibrium Models for Tunnel Face Stability in Composite Soft-Hard Strata

Zhang,

Song,

Yao

et al. 2023

Applied Sciences

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The tunnel face stability in composite strata, commonly referred to as the soft upper and hard lower condition, is a critical challenge in tunnel construction. The soft–hard ratio (SA) strongly influences the limit support pressure as well as the failure mechanism experienced by a tunnel face. This study focused on the Xingye Tunnel project in the Xiangzhou District of Zhuhai City. By conducting numerical simulations, the impact of different SAs on the limit support pressure was investigated. Furthermore, a limit equilibrium model was established on the basis of the analysis of the results of numerical simulation. The findings were then compared and analyzed alongside those of relevant theoretical models. In the event of tunnel face instability of composite strata, the deformation tends to be concentrated mainly in the soft soil layer, with less noticeable deformation in the hard rock layer. The investigation of different SAs revealed a linear decrease in the limit support pressure ratio of the tunnel face in composite strata as SA decreases. The self-stability of the tunnel face was observed when SA ≤ 0.125. Moreover, the limit support pressure ratio predicted by the truncated log-spiral model (TLSM) exhibited a higher degree of agreement with the results of numerical simulation than those of other relevant models. The superiority of TLSM was mainly demonstrated in the range of SA = 0.25 to 1.0.

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“…For the three soil layers involved in the model, the modified Mohr-Coulomb yield criterion was used as the constitutive model, that is, the actual hardened soil model. e hardened soil model is widely used in the numerical analysis of excavation engineering because it can better reflect the stress-strain relationship when soil is unloaded [31,32]. e constitutive relationship involved some parameters including the triaxial test secant stiffness E ref 50 , the tangent stiffness of the main compression loading test E ref oed , the unloading Elastic modulus E ref ur , the failure rate λ, and the reference pressure P ref .…”

Section: Materials Model and Parametersmentioning

confidence: 99%

The Ground Settlement and the Existing Pipeline Response Induced by the Nonsynchronous Construction of a Twin‐Tunnel

Sun

Rong

Wang

et al. 2021

Advances in Civil Engineering

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Shielding tunnel construction always has negative impacts on the surrounding buildings. Because of repeated disturbances caused by the construction, more attention should be paid to the impacts of the nonsynchronous construction of a twin-tunnel. In this research, a three-dimensional model was established to simulate the construction process of a twin-tunnel in a section of the Hefei No. 4 metro line, and the calculation results were validated with the measured settlement data. Based on the model, the ground settlement and the existing pipeline responses were studied in detail. The results showed that, after the first tunnel (FT) construction, the settlement curves conformed to a Gaussian distribution. Additionally, after the second tunnel (ST) construction, the final settlement curves were no longer completely symmetrical. The influences of the twin-tunnel space and the pipeline-soil relative stiffness on the settlements were further studied. The results showed that the final settlement curves of the ground surface and the pipeline were mainly W-shaped, U-shaped, and V-shaped. As the twin-tunnel space increased and the pipeline-soil relative stiffness decreased, the settlement curve gradually changed from V-shaped to W-shaped. C was defined as the ratio of two maximum settlements in the W-shaped settlement curve. As the space increased, C started to decrease from 1 and then increased to 1.

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Parameter Analysis on Hardening Soil Model of Soft Soil for Foundation Pits Based on Shear Rates in Shenzhen Bay, China

Cited by 19 publications

References 33 publications

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

Limit Equilibrium Models for Tunnel Face Stability in Composite Soft-Hard Strata

The Ground Settlement and the Existing Pipeline Response Induced by the Nonsynchronous Construction of a Twin‐Tunnel

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