高性能注浆体与岩锚结合面粘结性能的试验研究

发布时间：2018-07-02 21:54

本文选题：高性能注浆材料 + RPC　；参考：《铁道学报》2014年12期

【摘要】：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0.1~3MPa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。
[Abstract]:The common cement grouting material used in the current rock anchor system has some problems, such as low bond strength and poor durability, which leads to the large amount of underground engineering in rock anchorage system, low durability.RPC and DSP with high compressive strength, high durability and high toughness and so on, which may be the substitute of ordinary cement grouting material in rock anchor system. The bonding properties between RPC, DSP and limestone and the thread bar of finishing rolling are studied under different bonding lengths, and the bond strength and the failure form of the anchorage system are obtained. The results show that the bond strength between RPC, DSP and the finishing thread steel is 23.3~31.4 MPa, and the interface between the bar and the grouting body occurs in the test, and the grouting body is at this time. The corresponding bond strength between the limestone is 7.1~8.27 MPa, which is still far greater than the bond strength of 0.1~3MPa between the ordinary cement slurry and the rock. Based on the laboratory experiment, the bond properties between the RPC, DSP and the ordinary cement slurry and the granite are compared. The bonding properties of RPC, DSP, common cement slurry and granite under different bond lengths are studied. The bond strength and load slip curve of the joint surface showed that the bond strength between RPC, DSP, ordinary cement paste and granite was 11.50 MPa, 9.39 MPa and 2.57 MPa. respectively.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金(51078134)
【分类号】：U444;U445.72

【参考文献】