高性能注浆体与岩锚结合面粘结性能的试验研究

Experimental Research on Bond Performance of Bond Face between High-performance Grouting Materials and Rock Anchor

当前岩锚体系中使用的普通水泥注浆料存在粘结强度较低、耐久性较差等问题,导致岩锚体系地下工程量大、耐久性不足.RPC及DSP具有高抗压强度、高耐久性及高韧性等优良性能可能成为岩锚体系中普通水泥注浆料的替代品.基于现场拉拔试验,研究不同粘结长度下RPC、DSP与灰岩及精轧螺纹钢筋间的粘结性能,得到结合面间粘结强度及锚固体系破坏形式.结果表明：RPC、DSP与精轧螺纹钢间粘结强度为23.3～31.4 MPa,试验中发生螺纹钢筋与注浆体间界面破坏,此时注浆体与灰岩间相应的粘结强度为7.1～8.27 MPa,仍远大于普通水泥浆与岩石间0.1～3 MPa的粘结强度.基于室内推出试验,对RPC、DSP及普通水泥浆与花岗岩间粘结性能进行对比研究,研究不同粘结长度下,RPC、DSP、普通水泥浆与花岗岩间的粘结性能,得到结合面间粘结强度及荷载-滑移曲线.结果表明：RPC、DSP、普通水泥浆与花岗岩间粘结强度分别为11.50 MPa、9.39 MPa和2.57 MPa.

Ordinary grouting slurry used in current rock anchoring systems has the problems of low bond strength and poor durability,which leads to large quantities and poor durability of underground construction works.RPC and DSP are the new-type cement matrix composites which are featured by high compressive strength,long durability and high toughness.Because of their fine properties,RPC and DSP are probable to become the substitutes of the grouts in ground anchoring construction.By on-site pull-out tests,the bond performance between RPC and DSP with limestones and finish-rolled indented bars was studied with different bond lengths so as to get the bond strengths of bond faces and the modes of anchoring system failures.The test results indicate that RPC and DSP have a bond strength each about 23.3～31.4 MPa with finished indented bars,and when any failure happens to the interfaces between them and finished indented bars in tests,a bond strength about 7.1～8.27 MPa occurs between them and limestones which is far greater than that of about 0.1 ～3 MPa between the ordinary slurry and rocks.By indoor push-out tests,the bond performance between RPC,DSP,normal cement slurry and granites was studied with different bond lengths so as to get the bond strengths of bond faces and load-slip curves.The test results indicate that the bond strengths between RPC,DSP,ordinary cement slurry and granites are respectively 11.50 MPa,9.39 MPa and 2.57 MPa.