复合锚杆承载性能试验研究与数值模拟分析

Experimental study and numerical simulation analysis on bearing properties of composite anchor

复合锚杆具有承载力高、耐久性好、成本低、污染小等优点。为了解复合锚杆的极限承载力以及杆身受力特点,通过现场试验及数值模拟对比分析,得到认识如下:(1)半杆长粘结复合锚杆及底部锚固无粘结复合锚杆极限承载力高于全杆长粘结复合锚杆;(2)复合锚杆极限抗拔承载力估算可采用《建筑桩基技术规范》(JGJ 94—2008)中抗拔桩的估算方法;(3)杆身混凝土的受力状态对复合锚杆极限承载力产生了影响,减少杆身受拉段长度,可提高复合锚杆极限承载力;(4)根据实际工程需要,合理选用复合锚杆类型。

The composite anchor has the advantages of high bearing capacity,good durability,low cost and small pollution. In order to understand the ultimate bearing capacity and the stress characteristics of the composite anchor,the field test and numerical simulation are carried out.(1) The ultimate bearing capacity of half length bond composite anchor and bottom anchored composite anchor is higher than that of full length bond composite anchor;(2) The ultimate uplift bearing capacity of composite anchor can be estimated by the method of uplift pile in Technical code for building pile foundations( JGJ 94—2008);(3) The stress state of the concrete effects the ultimate bearing capacity of the composite anchor,the ultimate bearing capacity can be increased by reducing the length of tension section;(4) According to the need of project,the appropriate composite anchor should be selected.