广西忻城福六浪洼地堵洞成库施工实践

Reservoir construction through cutting off the underground water courseat the Forululang depression in Xincheng, Guangxi

摘要:

为解决广西忻城县城关镇弄长村一带万余人饮水问题及该岩溶石山区干旱农田引水灌溉问题，在广西忻城县隆光地下河福六浪洼地3号天窗下游钻取了投料孔和帷幕灌浆孔，先在投料孔投放碎石骨料，后在帷幕灌浆孔内灌入水泥砂浆或水泥浆液对先期投放的碎石骨料进行固结，修筑地下堵体防渗帷幕对流经福六浪洼地的隆光地下河管道实施堵截，成功地截住了隆光地下河水向下游排泄量，减少了洼地积水通过天窗、落水洞向下游的渗漏量，增加了天窗向洼地的溢洪量，建成了库容约250万m3的溶洼水库，基本解决了城关镇弄长村一带万余人生活饮水难的问题，提高了该溶洼水库周边、岩溶大石山区干旱农田灌溉水平和改善了当地村民的饮水条件。

Abstract:

In order to provide drinking water for more than 10000 people in Nongchang Village, Chengguan Town, Xincheng County, and divert water for irrigation of arid farmland in the karst rocky mountain area, feeding holes and curtain grouting holes were drilled in the lower reaches of the No.3 opening at the Fuliulang depression over Longguang Underground River, Xincheng County, Guangxi. Crushed stone aggregates were dropped through the feeding hole; then cement mortar or cement slurry was poured into the curtain grouting hole to consolidate the crushed stone aggregates to build the seepage proof curtain to block the underground river course which flows through the Fuliulang depression, which successfully intercepted the discharge of Longguang Underground River to the downstream, and reduced the leakage of water from the depression to the downstream through surface openings and underground caves; meanwhile increasing water overflowing from surface openings to the depression. As a result, A depression reservoir with the capacity of about 2.5 million cubic meters was built, resolving the difficulty in drinking water for more than 10000 people in Nongchang Village, Chengguan Town, alleviating the irrigation of dry farmland, and improving drinking water conditions for local villagers.