Failure modes and ultimate bearing capacity of the isolated stone column in soft soil
Failure modes and ultimate bearing capacity of the isolated stone column in soft soil
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DOI：
10.1007/s10064-020-02066-5
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发表时间：
2021-01
影响因子：
4.2
通讯作者：
Xin Tan;Longjian Feng;Zhengbo Hu;Ming-hua Zhao
中科院分区：
文献类型：
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作者：
Xin Tan;Longjian Feng;Zhengbo Hu;Ming-hua Zhao
软土中碎石桩的承载机理是一个复杂的问题，涉及到组成桩的散体材料与周围土体的相互作用。现有的极限承载力预测公式在极软土中可能存在局限性。采用数值模拟方法研究了软土中孤立石桩在加载全过程中的破坏过程。孤立碎石桩的极限承载力不仅受土体抗剪强度的控制，还受土体刚度的控制。根据模拟结果的观察和结论，建立了一种新的软土中孤立碎石桩极限承载力解析解。数值解验证了解析解的正确性。提出的解考虑了土的刚度和相应的碎石桩的破坏模式，这是不适当的考虑现有的理论方法。讨论了临界参数对软土中碎石桩极限承载力的影响。
The bearing mechanism of the isolated stone column in soft soil is a complex problem involving interactions of the granular material constituting the column and the surrounding soil. The existing ultimate bearing capacity prediction formulas may be limited in extremely soft soils. A series of numerical simulations were conducted to study the isolated stone column’s failure process in soft soil during the complete loading process. The ultimate bearing capacity of an isolated stone column is controlled not only by the soil shear strength but also the soil stiffness. Based on the observations and conclusions of simulation results, a novel ultimate bearing capacity analytical solution for the isolated stone column in soft soil has been established. Numerical solutions have verified the validation of the analytical solution. The proposed solution considers the soil stiffness and the corresponding failure mode of stone columns, which is not appropriately considered by the existing theoretical methods. The influence on the ultimate bearing capacity of the isolated stone column in the soft soil from the critical parameters has been discussed.