结晶堵塞隧道调研与现场试验--以云南某隧道为例

Research and Field Test of Crystallization Blocked Tunnel--Taking a Tunnel in Yunnan Province as an Example

本文以云南省某结晶堵塞高速公路隧道为例,通过现场调研、现场试验等手段,对该隧道的结晶体来源及预防措施进行了探析。结果表明:结晶体成分主要为CaCO_(3);结晶体CaCO_(3)中Ca^(2+)主要来源于水泥和速凝剂,CO_(3)^(2-)主要来源于地下水和CO_(2);利用20%掺量粉煤灰代替20%水泥,可以减少喷射混凝土的钙溶出作用。

Taking a crystallization blocked highway tunnel in Yunnan Province as an example,the paper sets out to explore the sources of crystallization and preventive measures for the tunnel through on-site investigation and field survey.The results show that the crystal composition mainly consists of CaCO_(3);the Ca^(2+) in the crystallized CaCO_(3) mainly comes from cement and accelerator,and the CO_(3)^(2-)mainly comes from groundwater and CO_(2);to solve the crystallization issue,20%cement can be replaced by 20%blended fly ash,which can slow down the calcium dissolution effect of the shotcrete.