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通过桩身埋设有钢筋应力计的2根直径不同的破坏性和非破坏性后注浆抗压试桩现场静载试验,对比分析了破坏性和非破坏性后注浆抗压试桩的受力性状。现场试验表明,极限荷载下非破坏性和破坏性后注浆桩的桩端力荷载分担比约为40%且同一桩顶荷载水平下,桩端荷载分担比随桩径的增大而减小。最大试验荷载下非破坏性试桩浅层土侧阻力完全发挥并有侧阻软化趋势,而破坏性试桩全桩长范围桩侧阻力均表现为软化性状。实测发现不同土中桩侧摩阻力充分发挥时对应的桩顶沉降约为(1%～4%)D(D为桩径)。非破坏性试桩实测得到的桩端位移–桩端力曲线表现为硬化特性,而试桩破坏性试验中实测得到的桩端位移–桩端力曲线表现为软化特性。
The static load test of two destructive and non-destructive post-grouting compression test piles with different diameters buried in the pile body is carried out. The effects of destructive and non-destructive post-grouting compression test are compared Force traits. Field tests show that the load-sharing ratio of pile-tip force of non-destructive and destructive post-grouting piles under ultimate load is about 40% and the load sharing ratio of pile-end decreases with the increase of pile diameter under the same roof load level . Under the maximum test load, the resistance of the shallow soil layer of the non-destructive test pile is fully exerted and the tendency of softening of the lateral resistance occurs. However, the lateral resistance of the long pile of the destructive test pile shows softening behavior. It is found that the settlement of pile top corresponding to full pile friction in different soil is about 1% ~ 4% D (D is pile diameter). The pile-end displacement-pile tip force curve measured by the non-destructive test pile shows the hardening characteristics, while the pile-end displacement-pile tip force curve measured in the destructive test of the test pile shows the softening property.