The paper has studied the strata distributive character and engineering geologic property of bed rock zone of weathering in cryptical coal field, based on large of data form testing and real-field materials, taking importance on the laws of overlying destruction and underground pressure behavior and the mechanism of decreasing protective coal columns while extracting proximity zone of weathering .

以大量實驗數(shù)據(jù)和現(xiàn)場測試資料為依據(jù)毛片视频免费观看视频大全，研究了隱伏煤田基巖風(fēng)化帶巖體的分布特點及工程地質(zhì)特性五级黄色毛片，重點論述了鄰近風(fēng)化帶開采的覆巖破壞和礦山壓力顯現(xiàn)規(guī)律以及縮小防護煤柱的機理国产一级婬乱片A片片片，為類似礦井的資源回收與安全開采提供了依據(jù)女的高潮喷水视频。

With numerical simulation method, the distribution law of coal pillar support pressure in the floor was studied.

運用數(shù)值模擬分析方法一级A片孕妇交免费看A级，研究煤柱支承壓力在底板的分布規(guī)律。

Obtained the calculation formulas of stripe—pillar size of two and three dimension in the pillar containing joints by analysing it. Studied the effect of joint trace, angle, density and tension strength on the stability of stipe—pillar. Obtained the upper—limit value of joint angle that has no effect on the stability of stripe—pillar.

通過對含節(jié)理煤柱的分析在线观看黄A片免费网站啊别停，獲得了含節(jié)理煤柱的二維欧美精品13页爽爽在线播放、三維條帶煤柱尺寸計算式，分析了節(jié)理跡長欧洲精品无码毛片、傾角美性爱、密度、抗拉強度對條帶煤柱穩(wěn)定性的影響国产又粗又大在线观看，獲得了節(jié)理對條帶煤柱穩(wěn)定性無影響的節(jié)理傾角上限值www.BLA片。

Then checking up mining practice, analyzing the observation and prediction data of dripping water amount and effusing water amount throughout mining. It is obvious from the research that the definitive width of waterproof pillar

研究結(jié)果表明，所確定的防水煤柱寬度滿足開采要求黄色精品视频在线观看精品免费，經(jīng)濟合理曰韩一级A片特黄无码；同時，所采用的幾種研究方法分析結(jié)果基本吻合亚洲一区在线二区在线，說明運用上述方法進行安全防水煤柱寬度的合理留設(shè)具有較強的可靠性午夜视频在线观看91，對類似礦山有一定的參考價值。

Based on the method of finite element orthogonal test,this paper designs the experimental scheme and gives numerical model of top coal drawing with non chain pillar entry protection .

根據(jù)有限元正交試驗法，設(shè)計了有限元正交試驗方案黄色视频男的操女的网站，建立了放頂煤無煤柱護巷的數(shù)值模型国产一级毛片久久久久久；通過對計算結(jié)果分析，得出放頂煤無煤柱開采沿空巷道的布置參數(shù)和支護形式十八禁视频在线，可為放頂煤無煤柱護巷提供理論依

Area of column of distributinging rule, coal forms the stress that combines coal post lower part the incidence of tall stress area and stoping model accident, the analysis pounds mine to press the course that produce and intensity, take different precaution and processing step in time, obtained very good result, get admissive in practice.

結(jié)合煤柱下方的應(yīng)力分布規(guī)律亚洲色图拍自拍、煤柱區(qū)域形成高應(yīng)力區(qū)的影響范圍和回采典型事故，分析沖擊礦壓發(fā)生的過程和強度老师嗯啊好深再用力一点免费视频，及時采取不同的預(yù)防和治理辦法一级a在线爱免费观看欧美，取得了很好的效果，在實踐中得到認可又粗又硬的免费黄色网站。

Based on principle of protection a point and a line on the ground,this paper puts forward the principle of similar ellipse method to design coal pillar for protection of buildings,and the method and step are proposed.

在保護地面上一點超碰免费一欧美精品、一條直線原理的基礎(chǔ)上，提出了似橢圓法留設(shè)保護煤柱的基本原理99热这里精品5，給出了留設(shè)保護煤柱的方法與步驟狠狠爱无码一区二区三区。

In this paper,the deformation law of supporting coal pillar at Sanbula district is analyzed by using numerical simulation and the reasonable size of coal pillar and the parameter of bolt in the entry is got.

采用數(shù)值模擬方法對天隆集團公司三不拉采區(qū)支撐煤柱的變形規(guī)律進行分析，得出了該采區(qū)的合理支撐煤柱尺寸以及巷道錨桿支護參數(shù)女人高潮被爽到呻吟的视频，對設(shè)計和施工有參考作用国产精品国产精品国产专区不卡。

In order to determine the size of coal pillar scientifically and reasonably, we mainly studied the law of stress distribution of the surrounding rock and the mechanism of narrow pillar drift and high strength bolt support and so on, indicating that using the narrow pillar drift and high strength bolt support can effectively guarantee the stability of gob-side entry in deep mine.

為科學(xué)合理地確定煤柱尺寸，保證沿空巷道的穩(wěn)定嫩草偷拍精品偷拍视频，研究了沿空巷道的圍巖應(yīng)力分布規(guī)律美女曰逼黄色网站、小煤柱護巷機理以及高強錨桿支護。從理論上證明了采用小煤柱護巷及高強錨桿支護方式理論上能夠有效地保證深井沿空巷道的穩(wěn)定一个人看的www在线高清图片。

The text obtains some data that caving span of immediate roof is 30m, caving span of main roof at first weighting is 42m and caving span of main roof at periodic weighting is 14m. Mining influence range is determined about 40m through numerical modeling, namely about three advance pillars were in the range of mining influence.

利用數(shù)值模擬得出煤柱采場直接頂?shù)目迓洳骄酁?0m摸美黄色网站视频摸黄色网站视频摸黄，老頂?shù)某醮蝸韷翰骄酁?2m，老頂?shù)闹芷趤韷翰骄酁?4m高清国产在线观看播放网站大全；通過模擬超前支承壓力日韩欧美一级片视屏，確定了采動影響范圍約為40m，即采場超前的三個煤柱都在影響之內(nèi)全免费精品一级毛片视频。

impermeable barrier：不透水煤柱

impermeable 不可滲透的 | impermeable barrier 不透水煤柱 | impermeable bed 不透水層

stander：煤柱

standard tool 標(biāo)準(zhǔn)工具 | stander 煤柱 | standing ground 堅實地層

stumping：回采煤柱

stump extraction 回采煤柱 | stumping 回采煤柱 | sub 分段

pillaring back：后退式回采煤柱

pillar thinning 礦柱部分回采 | pillaring back 后退式回采煤柱 | pilot boring 預(yù)先鉆進

barrier pillar：安全煤柱

barrier method 柱式開采法 | barrier pillar 安全煤柱 | barrier system 柱式開采法

barrier pillar：礦界煤柱 ; 防水煤柱 ; 保安煤柱

"barrier","阻隔 ; 堰洲[堤]" | "barrier pillar","礦界煤柱 ; 防水煤柱 ; 保安煤柱" | "barring-down","撬松石"

bearing block：礦枉煤柱

bearing alloy 軸承合金 | bearing block 礦枉煤柱 | bearing bush 軸承瓦

coal block：煤柱

coal bed 煤層 | coal block 煤柱 | coal briquette 煤磚

chain pillar：巷道煤柱

chain link 鏈節(jié) | chain pillar 巷道煤柱 | chain pin 鎖環(huán)銷

heading chain pillar：巷道煤柱

heading blast 階段爆破;超前工祖爆破;硐室爆破 | heading chain pillar 巷道煤柱 | heading charge 硐室裝藥