Experimental Study on the Pore Pressure of the Silty Soil Around Tunnel Under Subway Loading

Yan, Cui‐Wei; Zhiqiang, Shi

doi:10.1007/s10706-017-0320-y

Cited by 5 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dynamic triaxial test results from the silty soil surrounding the Shanghai Metro Line 10 tunnel, as reported in the literature [ 31 ], yield the following parameter values for Eqs. ( 2 ) and ( 3 ): a = 0.11, m = 1.42, t = 1.07, b = 0.19, c = 0.79, g = 1.45, k = 0.94, and l = 0.17.…”

Section: Calculation Model Of Long-term Settlement Of Tunnelmentioning

confidence: 99%

Study on dynamic response and long-term settlement of silty soil around Shanghai metro tunnel

Sang,

Yan,

Wang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

At present, the method for calculating long-term tunnel settlement predictions under metro loading considers only one working condition of passenger loading, which is inconsistent with actual working conditions. To establish a tunnel settlement model that accounts for variations in passenger flow, this study uses data mining methods to categorize metro operation into three working conditions: "peak period, secondary period, and low period." The impact of these passenger flow conditions on the dynamic response of the soil around the tunnel is analyzed. Then, based on the principles of calculus, a calculus-based prediction model is established to consider the changing patterns of metro passenger flow. The model is applied to analyze the long-term settlement characteristics of Shanghai Metro Line 10. The results indicate that, under identical conditions, soil displacement and dynamic deviatoric stress around the tunnel increase with passenger capacity. The calculus prediction model aligns more closely with actual working conditions than the conventional model. The predicted tunnel settlement of Shanghai Metro Line 10 after 20 years of operation is approximately 37.07 mm, with most settlement occurring in the early stages, primarily due to cumulative plastic deformation of the soil.

show abstract

Section: Calculation Model Of Long-term Settlement Of Tunnelmentioning

confidence: 99%

Study on dynamic response and long-term settlement of silty soil around Shanghai metro tunnel

Sang,

Yan,

Wang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…From the results of dynamic triaxial test of silty soil around the tunnel of Shanghai Metro Line 10 in literature [20] , the parameter values of Eq. ( 2) and Eq.…”

Section: Long-term Settlement Analysis Of Shanghai Metro Line 10 Tunnelmentioning

confidence: 99%

Study on Dynamic Response and Long-term Settlement of Silty Soil around Shanghai Metro Tunnel

Sang,

Yan,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

The current research on the long-term settlement prediction of tunnels under subway loading is generally based on the maximum passenger loading condition, and the influence of passenger flow changes on tunnel settlement is seldom taken into account, which leads to the discrepancy between the calculation conditions and the actual working conditions. In this regard, firstly, from the perspective of passenger flow pattern, the metro operation is divided into three working conditions, namely "peak period, secondary period and low period" by using data mining method. Afterwards, the dynamic response characteristics of the soil around the tunnel under each working condition are compared by numerical simulation, and it is found that the dynamic response results of each passenger working condition are quite different, and the influence of the passenger flow changes on the tunnel settlement cannot be ignored in the study. Then on this basis, based on the principle of calculus, considering the change rule of metro passenger flow, the explicit integral prediction model of long-term tunnel settlement is established, and relying on the measured data of Shanghai Metro Line 1, the reliability of the model is verified. Finally, the long-term settlement characteristics of tunnels in silty soil areas are analysed by taking Shanghai Metro Line 10 as an example. The results indicate that under the same conditions, the soil displacement and dynamic bias stress around the tunnel increase with the passenger capacity. The improved integral prediction model yields more accurate results compared to the conventional model and can be applied to research related to the prediction of long-term settlement of the metro. The long-term settlement of Shanghai Metro Line 10 develops faster in the early stage of operation, and the settlement after 5 years of operation is about 30.53 mm, which is 82% of the total settlement after 20 years (37.07 mm).

show abstract

“…To achieve normal consolidation of loess samples, consolidation pressures of 100 kPa were used, and isotropic consolidation was performed. Combined with the previous research results [20][21], the samples were subjected to cyclic loading with dynamic stress amplitudes of 20 kPa, 60 kPa, and 80 kPa, loading frequencies of 0.5 Hz, 1 Hz, and 2 Hz, and loading vibration times of 12000.…”

Section: Test Planmentioning

confidence: 99%

The Study on Deformation Characteristics and Stiffness Degradation of Loess near Active Faults

Fei

Liu

Gao³

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In order to explore the deformation characteristics and stiffness degradation of loess near active faults under subway loading, a series of dynamic triaxial tests were utilized to model the effect of subway loading on loess near active faults. The cumulative plastic strain characteristics and stiffness degradation laws of loess under different dynamic stress amplitudes and different loading frequencies are obtained, and the cumulative plastic strain and stiffness degradation indices are fitted using empirical formulas and degradation models, respectively. The results show that the growth rate of cumulative plastic strain and the attenuation degree of stiffness degradation index are large under large dynamic stress amplitude and low loading frequency. And the empirical formula accurately fits the cumulative plastic strain curve, and the correlation coefficient is more than 0.9. Furthermore, the degradation model fits the stiffness degradation index curve well, and the degradation parameter increases with increasing dynamic stress amplitude and decrease with increasing frequency. The findings of the study can be used to guide the construction and safe operation of subway tunnels that traverse active faults.

show abstract

Experimental Study on the Pore Pressure of the Silty Soil Around Tunnel Under Subway Loading

Cited by 5 publications

References 7 publications

Study on dynamic response and long-term settlement of silty soil around Shanghai metro tunnel

Study on dynamic response and long-term settlement of silty soil around Shanghai metro tunnel

Study on Dynamic Response and Long-term Settlement of Silty Soil around Shanghai Metro Tunnel

The Study on Deformation Characteristics and Stiffness Degradation of Loess near Active Faults

Contact Info

Product

Resources

About