深埋復雜巖溶區(qū)地質(zhì)災害分析及治理-預覽頁
【正文】 水向盆地中下部（西坑老屋村）集中，盆地四周為上侏羅統(tǒng)凝灰?guī)r、下石炭統(tǒng)測水組和泥盆系上統(tǒng)碎屑巖及燕山期花崗巖，組成良好的隔水邊界，且隧洞北側(cè)為背斜西北翼測水組絹云母片巖、泥質(zhì)粉砂巖隔水層。塌陷點處砂卵石層直接覆蓋在溶槽堆積物之上，構(gòu)成砂卵石層孔隙潛水與巖溶水的垂直通道。5．隧洞掘進至F38斷裂帶時，遇溶洞或溶蝕裂隙，地下水突然涌入隧洞，涌水量約200m179。因地下水位大幅降低，失去地下水充填，浮托作用，引起土層壓縮固結(jié)，產(chǎn)生大面積地面沉降變形、開裂。隧洞掘進前必須先堵水，再掘進，邊堵水邊掘進。嚴禁超長開挖，必須留足下段止?jié){巖盤厚度；（5）單孔注漿在達到設(shè)計注漿壓力時穩(wěn)定10~15min，方可結(jié)束注漿；（6）單孔（包括檢查孔）涌水量≤179。一號隧洞供水網(wǎng)絡(luò)干線已全線貫通，已通水至西瀝——鐵崗水庫，圓滿解決了深圳的缺水問題。 Research Institute Shenzhen 518026)Abstract: When Shenzhen eastern water supply tunnel was dug to West Tunnel Village, Henggang Town of Shenzhen city, a large amount of water gushed out of the earth surface suddenly by 200 cube meter per hour. Later some phenomena occurred, for example, drying of well, surface settlement, local caving in of ground, house collapse. In order to find out the causation of the above phenomena, Shenzhen Water Affairs Bureau invited many experts in hydrology and engineering geology to discuss the relevant problems. The experts thought that ground caving in was closely related to solution unanimously. But according to Shenzhen geological map of 1:50000 and the detailed investigation report, there was no solution stratum in Old House area. So experts thought that there was something wrong about the judgment of the stratum. They suggested to make clear the lithology and the hydrological conditions by means of drilling and physical exploration in such area. Shenzhen Water Affairs Bureau mitted Shenzhen Investigation amp。第一作者通訊地址：廣東省深圳市福田區(qū)福中東路15號勘察研究院 郵編5180267 /
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