建立破碎围岩的力学模型，求破碎围岩中连拱隧道荷载的理论解。
Their related mechanical models are established and theoretical solutions to the calculation of chain tunnel load inside broken rock mass are obtained.
实践表明，两步耦合注浆技术是解决松散破碎围岩支护的有效途径。
The practices showed that the two stage coupling grouting technology is an effective access to solve the difficult support problem of the incompact and fractured surrounding rock.
软弱、破碎围岩的公路隧道支护一直是困扰公路隧道施工的技术难题。
The support for porous and broken wall rock has been a major technical challenge in construction of highway tunnels.
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