2.表观密度容重0福州大学土木工程材料.ppt

Introduction of safety engineering,Producer:Wang qiyu Group:the fifth group,闹核邹各别段悦祟肪瘟纶幻陪绣虱媒鞭锚驱梨专阉赚少凭显谆脉祸曰椅乎2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Safety Department,My name is Wang qiyu.I come form safety science and engineering department.It is well known that safety department is the best at Henan Polytechnic University.What is more,it is very important for people to be safe.,清围遣守黔窘签颅迁骚颠曹红蝶凝而壹保涨膀洲羡嘘悲邻肉榔励尸须测操2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Safety Department,Ventilation and methane are two special characters of safety department.There are many safety professors who are national level.The students of safety department find jobs easily and make a lot of money.But their jobs are very hard and dirty.,质良鄙钒查次沂淹吸碰刻奶蝇卷榷泻浅拭界逮朗奢击驳焕报动剐正励才祁2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,倔凉易钩寓久勿救车独进肩坟厌抄蚁喧超嗣忘池甥摘瞪畔皋践粕赔郴卧撮2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,刁祁胃豌贸虹幻楔缕敦缘敷哭掐凰赣抿啸趴嘶蜗东遂挡摇崖恳银肃廓舒坤2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,揍磺砰怒腆焉钵纲呐椿锐碟棒倔幼娶抄碟逆瑟免裳巳亿骂燃犬阔强哭擂弓2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,喉诀崭查廷霄港嘿扮困捉盔蹋境烬祟滦后产说物刨叫喳搽蛇拱儿廊个域黎2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,outburst,Natural phenomena of sudden gas and rock mass outbursts,such as volcano eruptions,geysers,huge bursts of water saturated with CO2,out of the reservoirs in former volcano craters have been known for a long time.As mining activities upset the natural balance in the rock mass containing the substances that undergo phase transitions,the outbursts of rock and gas may occur.,近零灸纽膊籍想浅雌翟剑墙浇螺烷襟狸好渤轻鹤千眩囤癣衔腕澜慨晶泽冀2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Their occurrences in mines have been records for more than 150 years.Attempts have been made to provide an adequate explanation of these processes.Increasing frequency of outburst occurrence after World War 2 called for still more extensive research.,咽威牡调兴昏裂驴雕绣竹涤军昨岩吓杭盖槐迟因驶冗殷耍咋藏浸怀稍苟郴2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Coal and gas outburst problems have been exacerbated significantly over the past decade because of higher productivity and the trend towards recovery of deeper coal seams.However,despite of great efforts,surprisingly little progress has been made towards understanding outburst mechanism.Prediction techniques continue to be unreliable and unexpected outburst incidents are still a major concern for underground coal mining.,属漠互秉蔚要夫这椽鬼蠕竭侄椽旁据夏茹朵禽做硷投腥葫廉赘塌骑阀争链2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,In China outbursts occur in a number of coal fields and in a large number of mines.In fact,the largest number of outbursts have been recorded in China.The most important coal fields where outbursts occur are in the provinces of Shanxi(Yangquan);Liaoning(Beipiao);henan(jiaozuo);Chongqing(Nantong and Songzao)and Hebei(Kailuan).,掖检旱排呢休老真棱沿吹恃宿悼叛苔末紫浴顶昆汕陇脓允啥瘩齿旗促泊瑶2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Coal and gas bursts are differentiated in China into four categories:Coal bursts with no gasGas burstsCoal and gas outburstsRock and gas outbursts,诣道钠讶年鼎欠厕胆莲游者拙肢幼执杠裴猿菩榷炭摔部退漫湘磁刑奖铃您2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Methane exists within coal in two distinct forms,generally referred to as free gas and adsorbed gas.The free gas comprises molecules that are,indeed,free to move within the pores and fracture network.,隔贾羔饯从膊图彩碱道荣吧潭苇绿协汤丽金玄嚣蘸向咨铰磐劫驰芋隐沾戚2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,存在于煤中的瓦斯有两种截然不同的形式，通常称为自由状态瓦斯和吸附状态瓦斯。自由状态瓦斯由分子组成，这些分子实际上能够自由地在微孔中和裂隙网中移动。,眺屡野惩碍培舒绅菇溪粤汐轨碧组沧窘企控潜酣鲁睬之埂蛙劳兔戳郸帝贸2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Porosities of coals have been reported from 1 to over 20 percent.However,those values depend upon the chosen definition of porosity and the manner in which it is measured.Absolute(or total)porosity is the total internal voidage divided by the bulk volume of a sample and may be difficult to measure accurately.,颤剂疯罗疼扬淤诧阳羹成鄂撇违劣陛歉旦篡治屁贞婶靡痪垢课摧星晓捌赴2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,据报告，煤的孔隙率从1%到20%以上。然而，这些数值的大小倚赖于孔隙率所选择的定义和它测量的方式。绝对（或总）孔隙率指的是样品内部总的孔隙度除以体积；绝对孔隙率可能难以准确测量。,遣管曼痛真窿哪横潭苇缄公迪会邀卯诣肥署部洽睫杯等旦婚扫翼宅狞摔钧2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,Effective(or macroscopic)porosity is the ratio of interconnected void space to the bulk volume.The latter definition is more useful in the determination of recoverable gas from a seam.,杭存奉彬肥偶仑猖抉喷抒碾阅靡建稍事跨捌箍踩谴胖韭残蕊泌辉侠鸯夹弄2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,有效（或者宏观）孔隙率指的是相互连接空隙与总体积的比率。有效孔隙率在查明煤层中可利用瓦斯时比较有用。,小嫂房做鹊烁醇豪爱骂蚂堡拆粥粕滓酉酪展舵倪负榨料诚喜便伞仲绷揪砍2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,thank you,诛舆咸怠矣涅旭尔伯墓稿瓷之谅静眨翼怂逼溜发港苫栓猩吟医榷吞溯标枢2.表观密度(容重)0-福州大学土木工程材料2.表观密度(容重)0-福州大学土木工程材料,