摘要
根据能量原理,推导了压力型锚杆的轴力与位移计算式。其中锚固体与周围土层的黏结力计算采用弹塑性剪切位移模型,并考虑因位移过大而发生土层卸荷的情况。提出了最小势能原理在压力型锚杆问题中的应用方法,并给出了能量方程的程序求解流程。最后通过算例分析了压力型锚杆在各级荷载下的轴力、位移以及剪应力分布情况,进一步讨论了压力型锚杆的荷载-位移曲线,计算了压力型锚杆极限锚固长度。得出的结论:①压力型锚杆在大部分荷载下都处于弹性工作阶段,一旦进入塑性状态,就表明即将达到承载力极限;②考虑土层卸荷情况的锚固体能量传递理论可以解释压力型锚杆极限锚固长度的存在。
According to the energy principle,the formulae for axial force and displacement are derived.The shear stress between grout and soil is computed by use of the elastic-plastic shear displacement model,and soil unloading because of large displacement is taken into consideration.An application method of the principle of the minimun potential energy in pressure-type anchor problem is presented.The solution to the energy equation is given.Through a case,the distribution of axial force,shear stress and displacement of pressure-type anchor under various load levels is analyzed,load-displacement curve is discussed,and the ultimate anchorage length is computed.The conclusion are：① the pressure-type anchor is mainly in elastic state under most load levels,and it will soon reach the ultimate bearing capacity once it enters the plastic state;② the anchorage body energy transfer theory,which takes soil unloading into consideration,gives an explanation of the ultimate anchorage length of pressure-type anchor.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2011年第4期529-534,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50878083)
关键词
压力型锚杆
能量原理
数值计算
荷载–位移曲线
极限锚固长度
pressure-type anchor
energy principle
numerical simulation
load-displacement curve
ultimate anchorage length
