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(shí)驗(yàn)數(shù)據(jù)和現(xiàn)場測試資料為依據(jù)，研究了隱伏煤田基巖風(fēng)化帶巖體的分布特點(diǎn)及工程地質(zhì)特性这里只精品视屏，重點(diǎn)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(hù)煤柱的機(jī)理国产伦精品一区二区三区免费视频，為類似礦井的資源回收與安全開采提供了依據(jù)。

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

運(yùn)用數(shù)值模擬分析方法日韩另类综合福利网站在线播放视频，研究煤柱支承壓力在底板的分布規(guī)律亚洲丶欧美丶日韩在线一。

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，獲得了含節(jié)理煤柱的二維日本PP视频、三維條帶煤柱尺寸計算式国产色噜噜噜在线精品蜜臀，分析了節(jié)理跡長、傾角男人的天堂精品一区二区AV、密度国产麻豆色视频在线观看、抗拉強(qiáng)度對條帶煤柱穩(wěn)定性的影響欧美综合色一区二区三区，獲得了節(jié)理對條帶煤柱穩(wěn)定性無影響的節(jié)理傾角上限值又爽又黄人妖免费视频。

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pp.94在线免费，經(jīng)濟(jì)合理；同時大香蕉日韩亚洲网在线播放，所采用的幾種研究方法分析結(jié)果基本吻合猛操视频，說明運(yùn)用上述方法進(jìn)行安全防水煤柱寬度的合理留設(shè)具有較強(qiáng)的可靠性，對類似礦山有一定的參考價值日木一级坐爱片。

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(yàn)法产国69囗交视频国产，設(shè)計了有限元正交試驗(yàn)方案，建立了放頂煤無煤柱護(hù)巷的數(shù)值模型欧美视频黄页播放大全；通過對計算結(jié)果分析日韩美女偷自拍视频网站在线观看免费，得出放頂煤無煤柱開采沿空巷道的布置參數(shù)和支護(hù)形式，可為放頂煤無煤柱護(hù)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wwwjjzz、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A级毛片误无码免费真人久久，分析沖擊礦壓發(fā)生的過程和強(qiáng)度，及時采取不同的預(yù)防和治理辦法欧美A片激情，取得了很好的效果干操美女，在實(shí)踐中得到認(rèn)可。

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(hù)地面上一點(diǎn)欧美又粗又大午夜AAA级、一條直線原理的基礎(chǔ)上无码日韩免费专区迅雷下载，提出了似橢圓法留設(shè)保護(hù)煤柱的基本原理，給出了留設(shè)保護(hù)煤柱的方法與步驟国产av日韩。

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(tuán)公司三不拉采區(qū)支撐煤柱的變形規(guī)律進(jìn)行分析黄色网站在哪里，得出了該采區(qū)的合理支撐煤柱尺寸以及巷道錨桿支護(hù)參數(shù)，對設(shè)計和施工有參考作用5566影音先锋在线。

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小黄片大全，保證沿空巷道的穩(wěn)定，研究了沿空巷道的圍巖應(yīng)力分布規(guī)律www.狼友视频网站、小煤柱護(hù)巷機(jī)理以及高強(qiáng)錨桿支護(hù)欧美黑人巨大又粗又长。從理論上證明了采用小煤柱護(hù)巷及高強(qiáng)錨桿支護(hù)方式理論上能夠有效地保證深井沿空巷道的穩(wěn)定。

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毛片.com，老頂?shù)某醮蝸韷翰骄酁?2m美女福利操一操，老頂?shù)闹芷趤韷翰骄酁?4m；通過模擬超前支承壓力91精品视频在线无码，確定了采動影響范圍約為40m日韩AV无码久久一区二区，即采場超前的三個煤柱都在影響之內(nèi)。