1. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China;
2. College of Civil Engineering, Tongji University, Shanghai 200092, China;
3. People's Government of Bianxiong Township, Sangzhuzi District, Xigaze 857000, China
Abstract：On the basis of the post-grouting process of the field pile test, the self-developed grouting device and grouting technics are used to carry out the indoor model pile tests of post-grouting with 7 pile models in homogeneous sandy soil, to study the bearing characteristics under different grouting pressure and different grouting volume. The test results show that after grouting, ultimate bearing capacity of the pile is significantly improved, the range of improvement is 213%~347%, and the effect of grout back from the end of the pile also enhances the shaft resistance of piles; there is an optimum grouting pressure under the same grouting amount and it is 0.3MPa in this test; under the optimum grouting pressure, the bearing capacity of the pile becomes higher with the increase of the quantity of grouting, but the increment decreases. Calculated by unit grouting quantity, the strength increment per liter slurry decreases from 200% to 106.8% with the grouting volume increasing from 1L to 4L, but the height of grout back from the end of pile increases from 0.65m to 1.0m.
许 凯 赵春风 于 淼 费 逸 施皆能 秦若凌. 均质砂土中桩端后注浆抗压桩室内模型试验研究[J]. 土木工程学报, 2019, 52(S2): 81-88.
Xu Kai Zhao Chunfeng Yu Miao Fei Yi Shi Jieneng Qin Ruoling. The experimental model pile test study of post grouting compressive pile in homogeneous sandy soil. 土木工程学报, 2019, 52(S2): 81-88.
