Abstract
Double-row stabilizing piles are widely used to stabilize large-scale landslides. The construction process of double-row stabilizing piles is often accompanied by constructional time delay (CTD), which is defined as the time interval between the installation of front-row and rear-row stabilizing piles. The CTD is often selected based on the designer’s experience and the construction arrangement due to the lack of design guidelines for double-row stabilizing piles. In this paper, the CTD is considered as a design parameter and optimized based on the robust design concept. The signal-to-noise ratio, which is a function of the mean and standard deviation of factors of safety (FOS) of the stabilizing piles, is used as a measure of the design robustness. The FOS of the double-row stabilizing piles are computed using an analytical model that considers the CTD. A framework based on the concept of robust design is proposed for determining the most preferred CTD considering multiple objectives, including safety, cost, and design robustness. This framework is illustrated with a case study, the Hongyan landslide project, Taizhou, Zhejiang, China. Based on the outcome of this study, the most preferred CTD is obtained.
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Abbreviations
- b :
-
Width of the pile cross section
- b p :
-
Calculated width of the pile cross section
- E :
-
Elastic modulus of the pile
- F f :
-
FOS of the front-row stabilizing piles
- F r :
-
FOS of the rear-row stabilizing piles
- \( \overline{F_{\mathrm{f}}} \) :
-
Mean of the FOS of the front-row stabilizing piles
- \( \overline{F_{\mathrm{r}}} \) :
-
Mean of the FOS of the rear-row stabilizing piles
- F s :
-
Target factor of safety of the piles
- I 1 :
-
Moment of inertia of the front pile
- I 2 :
-
Moment of inertia of the rear pile
- k 0 :
-
Coefficient of subgrade reaction
- L :
-
Pile length
- l 1 :
-
Length of front pile section in the sliding layer
- l 2 :
-
Length of front pile section in the stable layer
- l 3 :
-
Length of rear pile section in the sliding layer
- l 4 :
-
Length of rear pile section in the stable layer
- \( {l}_{\mathrm{e}}^{\mathrm{m}} \) :
-
Euler distance between the mth feasible design and the utopia point
- M :
-
Number of designs in the design space
- M maxf :
-
Maximum bending moment of the front-row stabilizing piles
- M maxr :
-
Maximum bending moment of the rear-row stabilizing piles
- M uf :
-
Ultimate bending moment of the front-row stabilizing piles
- M ur :
-
Ultimate bending moment of the rear-row stabilizing piles
- N :
-
Number of random samples of k0
- \( {S}_{F_{\mathrm{f}}} \) :
-
Standard deviation of the FOS of the front-row stabilizing piles
- \( {S}_{F_{\mathrm{r}}} \) :
-
Standard deviation of the FOS of the rear-row stabilizing piles
- SNR 1 :
-
Design robustness of the front-row stabilizing piles
- SNR 2 :
-
Design robustness of the rear-row stabilizing piles
- t :
-
Time
- t D :
-
Time when the rear-row stabilizing piles were installed
- X i :
-
ith objective function in the design space
- [X i]max :
-
Maximum value of the ith objective function Xi
- [X i]min :
-
Minimum value of the ith objective function Xi
- X n :
-
Normalized value of the ith objective function Xi
- \( {x}_1^{\mathrm{m}} \) :
-
Cost of the mth feasible design
- \( {x}_2^{\mathrm{m}} \) :
-
Value of SNR1 of the mth feasible design
- \( {x}_3^{\mathrm{m}} \) :
-
Value of SNR2 of the mth feasible design
- \( {x}_{\mathrm{i}}^{\mathrm{m}} \) :
-
Value of the ith objective for the mth feasible design
- y top(t):
-
Head displacement history of the front-row stabilizing pile
- y top(t D):
-
Head displacement of the front-row stabilizing pile at the time when the rear-row stabilizing piles were installed
- z 1 :
-
Independent variable in the expression of the bending moment, which ranges from 0 to l1
- z 2 :
-
Independent variable in the expression of the bending moment, which ranges from 0 to l2
- z 3 :
-
Independent variable in the expression of the bending moment, which ranges from 0 to l3
- z 4 :
-
Independent variable in the expression of the bending moment, which ranges from 0 to l4
- α :
-
Intermediate parameter that is used to reduce the complexity of the bending moment expressions in Eq. (7)
- β 1 :
-
Characteristic value of a beam on elastic foundation of the front pile
- β 2 :
-
Characteristic value of a beam on elastic foundation of the rear pile
- \( {\delta}_{y_{\mathrm{top}}} \) :
-
Intermediate parameter that is used to reduce the complexity of the bending moment expressions in Eq. (2)
- \( {\delta}_{y_{\mathrm{top}}}^{\prime } \) :
-
Intermediate parameter that is used to reduce the complexity of the bending moment expressions in Eq. (7)
- λ 1, λ 2, λ 3, λ 4 :
-
Intermediate parameters of the earth pressure calculation coefficient of the front pile
- λ 1′, λ 2′, λ 3′, λ 4′:
-
Intermediate parameters of the earth pressure calculation coefficient of the rear pile
- η 1, η 2, η 3, η 4 :
-
Calculation coefficients of the internal force of the front pile
- η 1′, η 2′, η 3′, η 4′:
-
Calculation coefficients of the internal force of the rear pile
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Acknowledgements
The authors wish to acknowledge the financial support of the National Natural Science Foundation of China (41807224, 41772276, 41772287), the Natural Science Foundation of Zhejiang Province (LQ17D020001), the Key R&D project of Zhejiang Province (2017C03006), and the Zhoushan City-Ocean College of Zhejiang University Joint Fund (2017C82220) for this study. The corresponding author wishes to thank Dr. Charng Hsein Juang for his help on the research of robust geotechnical design.
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Wang, Z., Yu, Y., Sun, H. et al. Robust optimization of the constructional time delay in the design of double-row stabilizing piles. Bull Eng Geol Environ 79, 53–67 (2020). https://doi.org/10.1007/s10064-019-01554-7
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DOI: https://doi.org/10.1007/s10064-019-01554-7