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金州石棉矿为海滨矿山,南临黄海,矿区用一对中央竖井开拓,布置在下盘灰岩中。主井净直径5米,掘进直径5.7米;副井净径4.7米,掘进直径5.5米,均位于岩溶发育区,施工中一直受溶洞突然涌水、涌黄泥的威胁。 (一)工程与水文地质概况 主、副井穿过的岩层为震旦系甘井子组硅质白云岩及厚层白云岩。主井-55～-82.5米为极破碎硅质白云岩,溶洞发育,溶洞断断续续延至-100米水平。有次井筒掘至-55米时,曾从溶洞涌出70多米~3黄泥,-100～-160米溶洞率为19％,其中-130～-160米段达51.3％,最大涌水量为54.51米~3/小时。副井-37.9～-47.9米的溶洞率为45.5％,-100.3～-152.3米为39.3％。从地表至-280米井段,由于溶洞发育,多次发生片邦,超挖量大。
Jinzhou asbestos mine beachfront, south of the Yellow Sea, mine with a pair of central shaft to open up, arranged in the next disk limestone. The main shaft has a net diameter of 5 meters and a diameter of 5.7 meters for excavation. The auxiliary shaft has a net diameter of 4.7 meters and a diameter of 5.5 meters for excavation, both of which are located in the karst development zone. (I) Overview of Engineering and Hydrogeology The strata through which the main and auxiliary wells pass are siliceous dolomites and thick dolomites of the Sinian Ganjingzi Formation. The main well -55 ~ -82.5 meters for the extremely broken siliceous dolomite, karst cave development, dissolution cave intermittent extended to -100 meters level. Once well borehole to -55 meters, from the cave in more than 70 meters ~ 3 yellow mud, -100 ~ -160 m cave rate of 19%, of which -130 ~ -160 m section reached 51.3%, the maximum inflow was 54.51 meters ~ 3 / hour. Auxiliary wells -37.9 ~ -47.9 m cave rate was 45.5%, - 100.3 ~ -152.3 meters 39.3%. From the surface to the well section of -280 meters, due to the development of karst caves, there have been many occurrences of the state of overburden and the amount of over-excavation is large.