For deep tunnel projects,selecting an appropriate initial support distance is critical to improving the self-supporting capacity of surrounding rock.In this work,an intuitive method for determining the tunnel’s initi...For deep tunnel projects,selecting an appropriate initial support distance is critical to improving the self-supporting capacity of surrounding rock.In this work,an intuitive method for determining the tunnel’s initial support distance was proposed.First,based on the convergence-confinement method,a three-dimensional analytical model was constructed by combining an analytical solution of a non-circular tunnel with the Tecplot software.Then,according to the integral failure criteria of rock,the failure tendency coefficients of hard surrounding rock were computed and the spatial distribution plots of that were constructed.On this basis,the tunnel’s key failure positions were identified,and the relationship between the failure tendency coefficient at key failure positions and their distances from the working face was established.Finally,the distance from the working face that corresponds to the critical failure tendency coefficient was taken as the optimal support distance.A practical project was used as an example,and a reasonable initial support distance was successfully determined by applying the developed method.Moreover,it is found that the stability of hard surrounding rock decreases rapidly within the range of 1.0D(D is the tunnel diameter)from the working face,and tends to be stable outside the range of 1.0D.展开更多
文章简单介绍了加速功率型电力系统稳定器（PSS-Power System Stabilizer）的主要原理、主要参数及含义，并结合某电厂投运实例，介绍了整定PSS参数的方法和电厂投运PSS的主要步骤，并且对加速功率型电力系统稳定器和一般电功率型电力...文章简单介绍了加速功率型电力系统稳定器（PSS-Power System Stabilizer）的主要原理、主要参数及含义，并结合某电厂投运实例，介绍了整定PSS参数的方法和电厂投运PSS的主要步骤，并且对加速功率型电力系统稳定器和一般电功率型电力系统稳定器的反调效果进行了对比。从其投运效果可以看出其优良的性能。展开更多
基金Project(2021JLM-49) supported by Natural Science Basic Research Program of Shaanxi-Joint Fund of Hanjiang to Weihe River Valley Water Diversion Project,ChinaProject(42077248) supported by the National Natural Science Foundation of China
文摘For deep tunnel projects,selecting an appropriate initial support distance is critical to improving the self-supporting capacity of surrounding rock.In this work,an intuitive method for determining the tunnel’s initial support distance was proposed.First,based on the convergence-confinement method,a three-dimensional analytical model was constructed by combining an analytical solution of a non-circular tunnel with the Tecplot software.Then,according to the integral failure criteria of rock,the failure tendency coefficients of hard surrounding rock were computed and the spatial distribution plots of that were constructed.On this basis,the tunnel’s key failure positions were identified,and the relationship between the failure tendency coefficient at key failure positions and their distances from the working face was established.Finally,the distance from the working face that corresponds to the critical failure tendency coefficient was taken as the optimal support distance.A practical project was used as an example,and a reasonable initial support distance was successfully determined by applying the developed method.Moreover,it is found that the stability of hard surrounding rock decreases rapidly within the range of 1.0D(D is the tunnel diameter)from the working face,and tends to be stable outside the range of 1.0D.
文摘文章简单介绍了加速功率型电力系统稳定器（PSS-Power System Stabilizer）的主要原理、主要参数及含义，并结合某电厂投运实例，介绍了整定PSS参数的方法和电厂投运PSS的主要步骤，并且对加速功率型电力系统稳定器和一般电功率型电力系统稳定器的反调效果进行了对比。从其投运效果可以看出其优良的性能。
