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一、两淮往年冻结井井壁的裂漏情况 建国初期(1954年及以后),在安徽省兴建的第一批新井,井筒大多只穿越了二、三十以至六、七十米厚度的表土层,无论是采用普通凿井或是特殊法凿井,其井壁大都没有出现过达到事故性程度的开裂和漏水。 七十年代以后,在两淮地区兴建的矿井井筒穿越表土层的厚度逐渐加深,如:潘一主、副井和中央风井为152米,潘一东风井为292米,潘二主井为252米;朱仙庄主、副井和中央风井为256米;临涣主、副井为238米。 随着表土层厚度的加大,井筒所受的地压值剧增,上述10个井筒(均采用冻结法施工)在井壁上出现的通病是都大小不等地出现了裂缝(指内井壁)。其中四个程度较轻,另外六个开裂都很严重,漏水很大。
First, the past two years, Lianghuai frozen well wall cracks In the early days after the founding of the PRC (1954 and beyond), the first batch of new wells built in Anhui Province, most of the wellbore only through the topsoil of two or thirty to sixty or seventy meters thick Layer, whether it is ordinary sinkholes or special method of sinkholes, most of the borehole wall did not appear to reach the degree of accidental cracking and water leakage. After the 1970s, the thickness of the mine shaft through the topsoil gradually deepened in the areas of Lianghuai, such as Panyi main shaft, auxiliary shaft and central shaft of 152m, Panyi Dongfeng shaft of 292m, 252 meters; Zhu Xianzhuang main and auxiliary shafts and central air shaft is 256 meters; Linjian main and auxiliary shaft is 238 meters. With the increase of topsoil thickness, the pressure value of the wellbore greatly increased. All the above 10 wellbores (all constructed by freezing method) appeared cracks in the borehole wall wall). Four of them are light, and the other six have very serious cracking and great water leakage.