The concept of ocean disposal site is proven technology. One of the most concerns in ocean disposal site is the leakage ofpollutants into the ocean from waste materials. In order to prevent its happening, technically,...The concept of ocean disposal site is proven technology. One of the most concerns in ocean disposal site is the leakage ofpollutants into the ocean from waste materials. In order to prevent its happening, technically, a vertical impermeable wall is constructedaround the disposal site. However, the conventional method fails to guarantee zero leakage due to method＇s limitation. This paperpresents the use of CCC （chain conveyor cutter） method to construct vertical impermeable wall. The feasibility of CCC for oceandisposal site is evaluated by means of pollutant dispersion model, and moreover, the result is compared with conventional method. Theresult indicates that the CCC method is technically feasible for ocean disposal site＇s construction. Additionally, this method showsbetter as for technique and economic point of view than that of the conventional method. One of advantage of CCC method is the abilityto construct homogeneous wall in regard to strength and permeability, which cannot be found in the conventional ocean disposaltechnology.展开更多
With complex topographic and hydrological characteristics,the landslide-induced surge disaster chain readily develops in mountainous and gorge areas,posing a huge challenge for infrastructure construction.This landsli...With complex topographic and hydrological characteristics,the landslide-induced surge disaster chain readily develops in mountainous and gorge areas,posing a huge challenge for infrastructure construction.This landslide-induced surge disaster chain involves a complex fluid-solid coupling between the landslide mass and a water body and exhibits complex energy conversion and dissipation characteristics,which is challenging to deal with using traditional finite element analysis.In this study,the energy evolution characteristics in the whole process of the disaster chain were first investigated,and the momentum-conservation equations for different stages were established.Then,the two-phase doublepoint material point method(TPDP-MPM)was used to model the landslide-induced surge disaster chain,and an experiment involving block-induced surge was modeled and simulated to validate this method.Finally,three generalized models were established for the landslide-induced surge process in a U-shaped valley,including subaerial,partly submerged,and submarine scenarios.The interaction mechanism between the landslide mass and the water body in the disaster chain was revealed by defining the system energy conversion ratio and the mechanism of evolution of the disaster chain from the perspective of energy.The results help further evaluate the secondary disasters,given the submerged position of the landslide mass.展开更多
为了进一步提升刮板输送机断链保护的可靠性,利用分散控制系统(distributed control system,DCS)强大的逻辑运算功能,提出一种基于DCS一体化的刮板输送机断链控制系统。该系统包括现场检测层和控制层两部分。现场检测层使用断链接近开...为了进一步提升刮板输送机断链保护的可靠性,利用分散控制系统(distributed control system,DCS)强大的逻辑运算功能,提出一种基于DCS一体化的刮板输送机断链控制系统。该系统包括现场检测层和控制层两部分。现场检测层使用断链接近开关和固态继电器完成链条状态信息的采集和初步处理,并将信号输入至DCS。控制层在DCS中进行逻辑组态,并对采集到的信号进行逻辑运算处理,实现远程实时监测及断链保护功能。实践证明,当发生断链故障时该系统能够及时发出保护信号,满足刮板输送机对断链保护的要求。展开更多
文摘The concept of ocean disposal site is proven technology. One of the most concerns in ocean disposal site is the leakage ofpollutants into the ocean from waste materials. In order to prevent its happening, technically, a vertical impermeable wall is constructedaround the disposal site. However, the conventional method fails to guarantee zero leakage due to method＇s limitation. This paperpresents the use of CCC （chain conveyor cutter） method to construct vertical impermeable wall. The feasibility of CCC for oceandisposal site is evaluated by means of pollutant dispersion model, and moreover, the result is compared with conventional method. Theresult indicates that the CCC method is technically feasible for ocean disposal site＇s construction. Additionally, this method showsbetter as for technique and economic point of view than that of the conventional method. One of advantage of CCC method is the abilityto construct homogeneous wall in regard to strength and permeability, which cannot be found in the conventional ocean disposaltechnology.
基金supported by the National Natural Science Foundation of China(Grant Nos.52179117 and U21A20159)the Youth Innovation Promotion Association of Chinese Academy of Sciences(CAS)(Grant No.2021325).
文摘With complex topographic and hydrological characteristics,the landslide-induced surge disaster chain readily develops in mountainous and gorge areas,posing a huge challenge for infrastructure construction.This landslide-induced surge disaster chain involves a complex fluid-solid coupling between the landslide mass and a water body and exhibits complex energy conversion and dissipation characteristics,which is challenging to deal with using traditional finite element analysis.In this study,the energy evolution characteristics in the whole process of the disaster chain were first investigated,and the momentum-conservation equations for different stages were established.Then,the two-phase doublepoint material point method(TPDP-MPM)was used to model the landslide-induced surge disaster chain,and an experiment involving block-induced surge was modeled and simulated to validate this method.Finally,three generalized models were established for the landslide-induced surge process in a U-shaped valley,including subaerial,partly submerged,and submarine scenarios.The interaction mechanism between the landslide mass and the water body in the disaster chain was revealed by defining the system energy conversion ratio and the mechanism of evolution of the disaster chain from the perspective of energy.The results help further evaluate the secondary disasters,given the submerged position of the landslide mass.
文摘为了进一步提升刮板输送机断链保护的可靠性,利用分散控制系统(distributed control system,DCS)强大的逻辑运算功能,提出一种基于DCS一体化的刮板输送机断链控制系统。该系统包括现场检测层和控制层两部分。现场检测层使用断链接近开关和固态继电器完成链条状态信息的采集和初步处理,并将信号输入至DCS。控制层在DCS中进行逻辑组态,并对采集到的信号进行逻辑运算处理,实现远程实时监测及断链保护功能。实践证明,当发生断链故障时该系统能够及时发出保护信号,满足刮板输送机对断链保护的要求。
