本文選題：楔形樁 + 極限承載力�。� 參考：《哈爾濱工業(yè)大學(xué)學(xué)報(bào)》2017年12期

【摘要】：為研究楔形樁相對(duì)等截面樁極限承載力提高機(jī)理及楔形樁承載力特性,根據(jù)楔形樁承載機(jī)理,將楔形樁承載過程分為彈性變形及擠土塑性破壞兩個(gè)階段.假定樁側(cè)土體發(fā)生破壞時(shí)應(yīng)力狀態(tài)服從Mohr-Coulomb強(qiáng)度準(zhǔn)則,建立了楔形樁承載力分析模型并提出了楔形樁極限承載力增大系數(shù).通過與已有模型試驗(yàn)分析對(duì)比驗(yàn)證了本文解答的合理性.在此基礎(chǔ)上,分析了承載力增大系數(shù)隨樁-土界面摩擦系數(shù)、楔形角、靜止土壓力系數(shù)等的變化規(guī)律.結(jié)果表明:本文理論方法能夠較為合理地預(yù)測楔形樁的極限承載力;楔形樁承載力增大系數(shù)隨著土體內(nèi)摩擦角增大而增大,但隨著靜止土壓力系數(shù)和樁-土界面摩擦系數(shù)增大而減小,同時(shí)存在特定的楔形角使得承載力增大系數(shù)最大.
[Abstract]:In order to study the increasing mechanism of ultimate bearing capacity of wedge pile relative to equal section pile and the bearing capacity characteristics of wedge pile, according to the bearing mechanism of wedge pile, the bearing process of wedge pile is divided into two stages: elastic deformation and plastic failure of squeezing soil. On the assumption that the stress state of pile side soil is based on Mohr-Coulomb strength criterion, the bearing capacity analysis model of wedge pile is established and the increasing coefficient of ultimate bearing capacity of wedge pile is put forward. The rationality of the solution is verified by comparison with the existing model test. On this basis, the variation law of bearing capacity increasing coefficient with the friction coefficient of pile-soil interface, wedge angle, static earth pressure coefficient and so on is analyzed. The results show that the theoretical method in this paper can reasonably predict the ultimate bearing capacity of the wedge pile, and the coefficient of increase of the bearing capacity of the wedge pile increases with the increase of the internal friction angle of the soil. However, with the increase of the static earth pressure coefficient and the pile-soil interface friction coefficient, the bearing capacity increase coefficient is maximum with the existence of a specific wedge angle.
【作者單位】： 巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室(同濟(jì)大學(xué));同濟(jì)大學(xué)地下建筑與工程系;
【基金】：國家自然科學(xué)基金(41272288)
【分類號(hào)】：TU473.11

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