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四川省南桐矿务局桐南煤矿对板塘铁路隧道下方煤柱进行了试采。板塘隧道位于川黔铁路三(江)万(盛)支线,离谷口河车站约1.2公里,隧道长107米。隧道两端峒口的半园拱断面用砂岩衬砌,峒身均为灰岩裸露的自然拱。该隧道处在南桐煤矿二井井田范围内,隧道煤柱压煤量达100万吨。铁路隧道煤柱的开采在我国还是第一次。
Tongnan Coal Mine of Nantong Mining Bureau of Sichuan Province conducted a trial mining of pillars below the Tongtang Railway Tunnel. The Tongtang Tunnel is located on the tributary of San (Jiang) Wanchuan Railway in Chuan-Qian Railway, about 1.2 km away from Taniguchi River Station, and the tunnel is 107 meters long. Semi-arched sections of the tunnel at both ends of the tunnel are covered with sandstone, and are all natural arches of exposed limestone. The tunnel is located in the Nantong Coal Mine two mine field, the tunnel coal pressure of 1 million tons of coal. Pillar mining in railway tunnel is the first time in our country.