CAJ | 학술논문

为研究风化软岩段桩基侧摩阻力承载特性和桩基安全性,采用自平衡试桩法对某工程水稳性较差的风化软岩段e根试桩进行测试分析。结果表明：自平衡法试桩荷载箱上部桩与传统静载法试桩的桩身受力方向相反,前者比后者端阻力发挥更充分；在2倍设计荷载作用下桩顶等效竖向位移较小,桩身侧摩阻力、端阻力大部分未充分发挥,实测桩侧摩阻力可能比勘察提供的侧摩阻力值大；按照经验法和简化法得到的e根试桩的计算安全系数差别较小,均大于2.2,验证了试桩的安全性和自平衡方法的可靠性。
위연구풍화연암단장기측마조력승재특성화장기안전성,채용자평형시장법대모공정수은성교차적풍화연암단e근시장진행측시분석。결과표명：자평형법시장하재상상부장여전통정재법시장적장신수력방향상반,전자비후자단조력발휘경충분；재2배설계하재작용하장정등효수향위이교소,장신측마조력、단조력대부분미충분발휘,실측장측마조력가능비감찰제공적측마조력치대；안조경험법화간화법득도적e근시장적계산안전계수차별교소,균대우2.2,험증료시장적안전성화자평형방법적가고성。
To research the bearing behaviors of pile side friction in weathered soft rock region and the safety of pile foundation, three test piles of a certain project were tested and analyzed by using the O-cell pile testing method at the weathered soft rock region where the water stability is poor. The test results indicate:( a) The stress direction of the pile shaft above the load box by O-cell pile testing method is opposite to that by traditional static load test method;the pile tip resistance by the former method is even more effectively exerted than by the latter method. ( b) Under the action of twice the design load, the equivalent vertical displacement at pile head is smaller; most of the pile side friction and tip resistance are not brought into full play;the actually-measured pile side friction may be bigger than that provided by survey department. ( c) The safety coefficients of three test piles are all greater than 2. 2; there is little difference between safety coefficients calculated respectively by empirical method and by simplified method;therefore, the safety of test piles and the reliability of O-cell pile testing method are verified.