An Experimental Study on the Wave-Induced Pore Water Pressure Change and Relative Influencing Factors in the Silty Seabed

In this study, a flume experiment was designed to investigate the characteristics of wave-induced pore water pressure in the soil of a silty seabed with different clay contents, soil layer buried depths and wave heights respectively. The study showed that water waves propagating over silty seabed can induce significant change of pore water pressure, and the amplitude of pore pressure depends on depth of buried soil layer, clay content and wave height, which are considered as the three influencing factors for pore water pressure change. The pressure will attenuate according to exponential law with increase of soil layer buried depth, and the attenuation being more rapid in those soil layers with higher clay content and greater wave height. The pore pressure in silty seabed increases rapidly in the initial stage of wave action, then decreases gradually to a stable value, depending on the depth of buried soil layer, clay content and wave height. The peak value of pore pressure will increase if clay content or depth of buried soil layer decreases, or wave height increases. The analysis indicated that these soils with 5% clay content and waves with higher wave height produce instability in bed easier, and that the wave energy is mostly dissipated near the surface of soils and 5% clay content in soils can prevent pore pressure from dissipating immediately.

Nursing Effects of Medical Treatment Combination on Patients at High Risk of Developing Pressure Ulcers at Rural Homes

Objective:To explore the nursing effects of medical treatment combination on patients at high risk of developing pressure ulcers at rural homes.Methods:From January 2018 to December 2018,86 patients at high risk of developing pressure ulcers at rural homes who were in Wenjiang Hospital were randomly divided into a control group and an observed group.The control group received the routine publicity and education and visiting,while the observed group adopted the cooperative nursing model of medical treatment combination.Then compare the healing status and nursing satisfaction of the two groups.Results:Of the 43 patients with pressure ulcers in the observed group,18 had been in the second stage of pressure ulcers and 16 had been healed;14 had been in the third stage of pressure ulcers and 8 had been healed;11 had been in the fourth stage of pressure ulcers and 5 had been healed.The nursing satisfaction of the patients in the observed group was 95.35%.Conclusion:Conducting medical treatment combination on patients at high risk of developing pressure ulcers at rural homes can effectively improve the patients’and their families’awareness of pressure ulcer nursing,standardize their nursing behaviour,help recover the patients themselves and promote the patients’satisfaction.

China's Development Approach Under Dual-gap Pressures

In the late 1970s,China firmly resolved upon a path of re- form and opening up to the outside world under a heightened sense of crisis stemming from the tremendous gap between China and developed countries in terms of economic development.China chose to accelerate industrialization in order to narrow this gap, but the cost of doing so is reflected primarily in the

First Systematic Testing Platform for Pressurization Feed System Developed for Liquid Rocket Propellant in China

Beijing Aerospace System Engineering Institute of China Academy of Launch Vehicle Technology (CALT) declared recently that theinstitute has set up a laboratory whichwould operate a newly

Maintaining Pressure on Sustainable Development

THE impression one gets after reading the 53-page resolution of the United Nations Summit on Sustainable Development, bet- ter known as Rio＋20, is that all those who compiled the document know what the so called ＂planet-in-peril＂ needs to cure its problems.

Numerical Analyses of Caisson Breakwaters on Soft Foundations Under Wave Cyclic Loading

A caisson breakwater is built on soft foundations after replacing the upper soft layer with sand. This paper presents a dynamic finite element method to investigate the strength degradation and associated pore pressure development of the intercalated soft layer under wave cyclic loading. By combining the undrained shear strength with the empirical formula of overconsolidation clay produced by unloading and the development model of pore pressure, the dynamic degradation law that describes the undrained shear strength as a function of cycle number and stress level is derived. Based on the proposed dynamic degradation law and M-C yield criterion, a dynamic finite element method is numerically implemented to predict changes in undrained shear strength of the intercalated soft layer by using the general-purpose FEM software ABAQUS, and the accuracy of the method is verified. The effects of cycle number and amplitude of the wave force on the degradation of the undrained shear strength of the intercalated soft layer and the associated excess pore pressure response are investigated by analyzing an overall distribution and three typical sections underneath the breakwater. By comparing the undrained shear strength distributions obtained by the static method and the quasi-static method with the undrained shear strength distributions obtained by the dynamic finite element method in the three typical sections, the superiority of the dynamic finite element method in predicting changes in undrained shear strength is demonstrated.

Research on the Regional Ecological Environment Evaluation and Application under the Influence of the Severe Earthquake Disaster

To conduct the ecological restoration and reconstruction of disaster areas after the severe earthquake, such as Wenchuan Earthquake and Lushan Earthquake, this article uses region al ecological environment evaluation and ecological footprint to construct a quantitative analysis model on the basis of ecololgical environment indexes in Mianzhu City. Through this model, resource status of the regional environment in Mianzhu is analyzed, as well as the ecological capacity and the ecological security. Based on the evaluation and analysis, this paper provides multi-path development strategies of ecological restoration and sustainable development of human settlements after the earthquake.