ABSTRACT The spiral heat exchanger of the energy pile groups is divided into multiple segments. Each segment regarded as a three‐dimensional source finite length. Based on segmental superposition method time and space, variable flow transfer model buried‐pipe considering between circulating water derived established. correctness simplified in this paper verified by comparing its results with those COMSOL element model. Additionally, used to study thermal interference groups. show that...

Helium is a critical, scarce, and strategic resource, often found in association with natural gas. This study reports the first discovery of overpressured helium-rich gas Lower Yangtze Region Eastern China, helium concentrations reaching as high 4.5%, significantly surpassing commercial extraction threshold 0.1%. Comprehensive geochemical analyses, including isotopes ratios, carbon isotope compositions CH4 CO2, compositional data, indicate that this region predominantly crustal origin....

The black shale in the upper Permian Dalong Formation is considered as an excellent source rock Lower Yangtze region. However, mechanisms of organic matter (OM) accumulation such a setting are scarcely understood. Here, characteristics total carbon (TOC) and elemental geochemistry 33 samples from GD1 well systematically investigated to characterize paleoenvironmental conditions OM mechanisms. Results show that lower middle parts (section A) display high TOC contents ranging 1.19 6.45%...

With the increasing demand of fuel and emission hybrid electric vehicles (HEV) with dual power sources, engine motor, has been one development ways clean automobiles. In research on vehicles, control powertrain is key issue. According to parallel this paper used fuzzy realize assist strategy membership function was optimized for economy decreasing emissions

The organic‐rich shale in the upper Permian Dalong Formation Southern Anhui Province is not only regarded as a high‐quality hydrocarbon source rock, but one of potential targets for oil and gas exploration China. Organic matter types such setting remain subject debate. major point controversy whether they are dominated by oil‐prone or gas‐prone types. A total 20 rock samples collected from Gangdi‐1 well were conducted analysis organic geochemistry. Results show that extracts exhibit wide...

Underground pipeline seepage and traffic load are the important factors causing city road collapse. In this paper, eight groups of indoor scale model experiments used to study collapse caused by seepage, taking into account type, buried depth, distance between loss channel, relative position formation time channel. The results show that when erosion channel was formed later, underlying cavity ellipsoid, while other cavities were funnel shaped. When only static is applied, reach ultimate...

Relatively few studies have been conducted to examine the effects of static pile driving on existing tunnels, and there is a lack guidance case that can be used as references. This article presents study tunnel Wuxi Metro Line 2 in China was performed investigate mechanism by which affects an metro structure. The provides theoretical basis for design construction schemes static-driven piles. driving–induced soil compaction excess pore-water pressure (EPWP) are studied through numerical...

By using finite difference software FLAC3D, the displacement field and stress of long-short-pile composite foundation were studied, as well distribution axial force, neutral position penetration amount. The effects main parameters on its working properties, such modulus thickness cushion, length quantity long pile, are investigated in detail. results show that cushion have less effect settlement, while they can affect pile-soil ratio significantly. Moreover, increasing number piles control...

<title>Abstract</title> Steel trusses have desirable bending performance; accordingly, a new type of stiffen deep cement mixing (SDCM) wall，namely wall (DCM) reinforced with prestressed steel tubular truss, is proposed in this paper. Its performance studied via model tests and 3D finite element simulations cement–soil composite beams. The deformation, stiffness, crack distribution characteristics different beams are compared analysed, the stiffness contribution truss to elucidated. According...

As the missions to be assigned UAV are more complex and rigorous, need for an extended on-board intelligent control capability is crucial. The increasing power of computational resources makes possible development flight systems which capable dealing with tasks in dynamic uncertain environments. Intelligent make have ability their own decisions. Hierarchical architecture offers very convenient ways describe operation deal complexity issues, it used extensively modeling systems. This method...

The wind power collection using DC grid technology has been considered as one of effective solutions for large offshore collection. paper analyses the technical requirements farm technology, and studies typical grids equipped with turbine output type, then builds equivalent model which is based on electro-mechanical transient characteristics. On this basis, coordinated control strategy sending system designed in detail, stable operation characteristics are discussed paper. simulation results...

In this study, we propose a concrete energy pile with improved heat transfer performance using high thermal conductivity silicon carbide. We performed unit test to the rate, and effects of material, operation mode, soil saturation around were studied in detail. The results showed that carbide exchange rate piles by approximately 20% compared ordinary concrete. Intermittent piles; continuous increased 18% 28% intermittent mode. increase saturation; was 82% higher saturated Silty than dry 90%...

Hansbo’s flow model for one-dimensional consolidation analysis of saturated clay has been widely recognized as being the most representative soft soils. Many studies have used to examine characteristics soil under various conditions. However, very few considered cyclic loading. In this study, using a and assuming known deformation rebound recompression soil, loading is established. A FlexPDE solution scheme with excess pore pressure <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1">...

At present, due to the lack of national mandatory new energy vehicle power battery pack specifications and standards, so each production enterprise is fighting for itself, size, connection mode interface are not unified, these factors seriously restrict large-scale application pack. Aiming at characteristics small batch multi variety in process pack, order realize automatic assembly on basis scientific reasonable planning a flexible testing line developed, It great significance manufacturers...

Abstract The adverse effects of ground vibrations can be eliminated or prevented by installation various types wave barriers, such as a row holes. analysis is accomplished with the aid series field experiments and numerical simulation. Three-dimensional semi-analytical boundary element models are established to use holes active barrier isolate generated machine foundation laid on surface saturated soil foundation, model parameters isolation effectiveness investigated discussed in detail. A...

According to the manufacturing and assembly process of battery pack system, this paper proposes a common model realize intelligent electric vehicle pack. And experimental verification platform is designed built. Several key links from actual production were extracted platform. These not only represent typical in pack, but also fully reflect automation, information intelligence manufacturing. It can simulate system small environment verify model. proposes.

摘要: 为阐明下扬子皖南地区上二叠统大隆组页岩特征，通过对港地1井岩心进行取样，开展了大隆组页岩样品的有机地球化学测试、氩离子抛光—扫面电镜观察、矿物组成分析等工作.结果表明皖南地区大隆组页岩TOC含量为1.18%~4.35%，干酪根以Ⅰ型为主，少数为Ⅱ1型，Ro介于1.15%~1.29%，反映大隆组页岩整体处于成熟的生油气阶段.饱和烃气相色谱图呈典型的单峰型分布，正构烷烃主峰碳数分布在nC18~nC22之间，nC25+高碳数正构烷烃含量较低.规则甾烷的丰度整体上表现为C27≈C29>C28，属于V型分布，且高、低碳数的正构烷烃单体碳同位素δ13C相差较大（3.0‰~5.6‰），略高于单一来源的不同碳数正构烷烃的δ13C变化（一般小于1.6‰），反映大隆组页岩有机质主体来源于菌藻类等低等水生生物，局部存在陆源高等植物.TOC与TS的相关性、Pr/Ph比值、Pr/nC17-Ph/nC18图解共同指示皖南地区大隆组页岩形成于缺氧—贫氧环境，有利于有机质保存. 关键词: 黑色页岩 / 生物标志化合物 有机质来源 沉积环境 大隆组 皖南地区 石油地质学

In order to provide a more comprehensive depiction of the actual heat transfer process in energy piles, this research paper presents an approximate solution for finite line source model operating under variable flow conditions. This is established by integrating and superposition principle. Furthermore, W-tube exchanger divided into many segments, segmented approach used based on thermal response. Consequently, single-pile formulated, taking consideration exchange between circulating water...

This paper presents a theoretically study on the time-dependent characteristic of soil-nail axial force in whole construction process foundation pit. Firstly, time-varying performance forces soil nails is analyzed according to measured lateral deformation curves pile-anchor and composite supporting deep Then combined with rheological model, formula nail put forward, simulated results are compared back-analyzed ones. Finally, predict pit established an example investigated validate method.

A new method of foundation treatment, called post treatment variable stiffness composite foundation, is studied in the paper, by using non-sand concrete micro pile technology to treat deep mixing cement-soil foundation. This suitable abutment transition section and control settlement high-fill embankment. In order investigate efficiency method, twelve in-situ tests has been taken at Daguang freeway consisted The test results demonstrate advantages this such as reducing road shoulder,...