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结合桩基受荷后桩周土应力状态分析,研究了桩周土达到极限平衡状态的条件,及其与桩周土极限侧阻力的关系。首先分析了桩基受荷后桩周土应力状态。根据库伦定律,建立了根据桩周土的应力状态计算桩周土侧阻力的方法。根据桩周土达到极限平衡状态时桩周土侧阻力与桩和桩周土之间的粘结强度的关系,建立桩周土极限侧阻力确定原则。进而提出根据试桩等测试结果与极限平衡计算结果的桩周土极限侧阻力计算方法。分析了土体埋深、桩周土侧阻力引起的附加应力长期作用、大面积堆载等对桩周土应力状态的影响。结合试桩实例分析,探讨桩周土极限侧阻力由桩周土应力状态控制时,桩周土极限侧阻力的变化规律。
Combined with the analysis of the stress state around the pile after the pile is subjected to the load, the condition that the soil around the pile reaches the limit equilibrium state and the relationship between the surrounding soil and the limit resistance of the soil around the pile are studied. First of all, the stress state of piles around pile after pile foundation is analyzed. According to Coulomb’s law, a method of calculating the lateral resistance of the soil around the pile based on the stress state of the soil around the pile is established. According to the relationship between the lateral resistance of the soil around the pile and the bond strength between the pile and the surrounding soil, the principle of determining the ultimate resistance of the soil around the pile is established. Then the calculation method of the limit soil resistance around the pile based on the test results of the test pile and the limit equilibrium calculation is put forward. The influences of soil depth, long-term action of additional stress caused by lateral soil resistance on pile side and large-area loading on the stress state of soil around pile are analyzed. Combined with the example analysis of test piles, the variation law of the limit lateral resistance of surrounding soil of piles is discussed when the limit soil lateral piles resistance is controlled by the soil surrounding piles.