To give the definition of the mass concrete and to concrete\'s cracks together with practical meanings of control ,and give a brief review on the research in the field at home and abroad, at last, methods to control temperature crack of the mass concrete from several aspects such as design measures,concrets material, construction schedules.etc are summed up; To explain the physical mechanics of the concrete and computing methods-Difference Method and Finite Element Method, and illustrate the application of their specific methods repectively;Several temperature factors that can influence the temperature stress of mass concrete baseplate are analyzed. The influence degree of temperature factor can be got through the ANSYS simulation computation the control of temperature can control the temperature stress, consequently control the temperature crack of mass concert baseplate; through the influence of the crack resistance ability of mass concrete baseplate which takes the reinforcement as a part is analyzed. By ANSYS simulation, the best suited volume ratio of reinforcement is found out, at same time the layout of reinforcement with the same volume ratio can also affect the resistance ability of mass concrete baseplate. Sum up of above analysis, anti-crack function of steel bar in early mass concrete baseplate is obvious, so it\'s necessary to consider beneficial effect of construction steel bar in research of temperature control on mass concrete baseplate.

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The floor of the vessel has a cavity (3) therein extending downwardly from the surface of the floor, and the lower end of the liquid reagent level sensor (2) and temperature sensor (1 and 11) are positioned in the cavity.

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In working, the tube via tube hoop is connected to the upper bottom plate (2); the lower bottom plate (3) is fixed to the groundsill; when the tube is vibrated, the distortion of spring can damp and adsorb the three-dimensional vibration of tube. The invention has lower natural frequency and wider temperature application, with simple structure and easy maintenance.

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The paper is based on the theory of inter-function between water and rock, and losing energy in rock mass, brought forward that the water flow has head loss during water flow intruding through the coal seam effective water-resisting layer and energy waste concept for splitting rock mass, and analyzed the form of the remaining water pressure. Through the simulation experiment in the preventing water capability of water-resisting rocks in the coal seam scaleboard, studied the law, character of the losing in water head waste and the relation to pressure, water-resisting of hydrogeology and engineering geology character. Brought forward the new method of calculating the water inrush coefficient.

通過理論分析和實驗研究，本文得出以下結(jié)論：高承壓水在沿煤層底板隔水層導(dǎo)升過程中存在著明顯的壓力水頭損失天天摸天天；同一地層條件下免费观看黄网站不卡影院视频，煤層底板承壓水水頭壓力越大其導(dǎo)升過程中的水頭壓力損耗就越大；同一水頭壓力條件下国产激情无码aⅴ视频，地層的滲透性越差其阻水能力越強香港性爱视频一区二区三区，水流導(dǎo)升過程中的水頭壓力損耗也越大；在同一介質(zhì)中mianfeihuangseshipin，當(dāng)初始水頭壓力不同時Aa在线免费观看网址，水流在導(dǎo)升過程中水頭壓力的衰減不同，在同一隔水介質(zhì)中底板含水層水頭壓力越大其沿隔水層導(dǎo)升過程中的水頭損耗也就越大日本精品视频在线观看，水頭損耗隨底板隔水層水頭壓力增加而呈遞增趨勢，另外它們相應(yīng)的水頭衰減速率也呈遞增趨勢又黄又爽免费网站，煤層底板隔

Those rarely refer to the researches about water pressure function mechanism. In fact, the water flow intrudes upwards with a loss of the distance water and energy wastes for splitting rocks when confined groundwater intrudes upwards through coal seam water-resisting layer. The water flow under the coal seam scaleboard consumes more energy after it intrudes at a certain height.

實際上色色色婷婷，煤層底板高承壓含水層水沿隔水底板巖層向上導(dǎo)升過程中，存在一定的沿程水頭損失和劈裂巖體裂隙的能量損耗蜜臀免费AV，下伏含水層高壓水在底板隔水層下部劈裂導(dǎo)升一定的高度后原创国产，在導(dǎo)升段的能量消耗很大，這時作用于有效隔水層段下部的實際水壓已遠遠小于含水層中的觀測水壓变态欧美亚洲日韩女优电影在线观看，真正作用在有效隔水層上的水壓為殘余水壓P_c视色4色视频，對底板有效隔水層起破壞作用的有效水壓力亦應(yīng)為殘余水壓。

Like dinghies, these boats have floors you don't have to remove when stowing the boat.

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In order to analyze the influence and damage of the top and bottom of rock mass in floor water-resisting layers due to water pressure in water bearing layer and mining pressure, this paper applies the methods of similar material simulation test and mechanical analysis of floor water invasion in the near of faultage to further comprehend the mechanism of floor water invasion.

為了分析底板含水層水壓及采動礦壓對底板隔水層巖體上部與下部的影響與破壞，應(yīng)用了相似材料模擬試驗以及斷層附近底板突水的力學(xué)分析方法色免费网站，對底板突水機理有了進一步的認識永久免费观看的毛片app；同時，由斷層附近底板突水的力學(xué)分析方法所得到的理論計算結(jié)果欧洲无码一区二区，也可以作為判別類似條件下遇斷層時承壓水體上采煤是否安全的依據(jù)日韩在线播放www。

In this paper,the stability of arch slab under the action of the plunging jet is investigated.The pressures on upper and lower surfaces of the slab and push force of arch abutment are measured.A generalized formula for uplift force is proposed.

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At the same time, the relationship between the magnetic flux leakage signals and the physical characters (including the width亚洲欧美日韩专区、depth and position) of the corrosions are studied. The results identify that, if the floor is saturated, the magnetic flux leakage intensity changes linearly with the changing of the corrosion diameter. When the corrosion is in the surface, the peak value of the signal is higher than it's in the back.

同時對缺陷直徑、深度以及處于底板上不同位置所產(chǎn)生的漏磁場信號差異進行研究国产精品免费久久久久影院无码，結(jié)果表明国产使劲cao视频，在磁化飽和條件下，平底孔缺陷漏磁場信號峰峰值與孔深度呈線性關(guān)系久久精品久久囯产精品，相同大小的缺陷處于底板下表面時檢測信號強度大于處于底板上表面時欧美黑逼。

The procedure is applied in two projects:(1) Shanghai Huanqiu finance center tower foundation pit dewatering, the complicated flow state of groundwater is simulated under these conditions which the aquifers deposite layer by layer, the bottom of the aquifers goes deep to 149m, the horizontal flow barrier goes deep to 34m, the extraction wells are penetrated to 55m, the filters of the extraction wells are located between 34m to 55m, and the water level in the deep foundation pit is decreased to 26m under land surface, the result of 8 pumping wells optimization project is designed.(2) The forth subway of Dong Jia-du tunnel repair foundation pit dewatering in Shanghai, the complicated flow state of groundwater is simulated under these conditions which the aquifers deposite layer by layer, the bottom of the aquifers goes deep to 144.45m, the horizontal flow barrier goes deep to 65m, the extraction wells are penetrated to 60m, the filters of the extraction wells are located between 45m to 60m, and the water level in the deep foundation pit is decreased to 42.45m under land surface, then an optimization project is designed.

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