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（1 上海同繼水資源技術(shù)有限公司， 上海 200082； 2 中交路橋建設(shè)有限公司， 北京 100027）

［摘要］高水位地區(qū)深基坑工程實(shí)踐中，多以止水帷幕輔以基坑降水的方式進(jìn)行地下水的處理。場地水文地質(zhì)參數(shù)的選取、降水方法的選擇，以及止水帷幕是否達(dá)到良好止水效果等是關(guān)系到基坑降水成功與否的幾個重要因素。莫桑比克馬普托大橋南錨碇基坑直徑50m，挖深超過36m，止水帷幕為地下連續(xù)墻，墻深56m。在地下連續(xù)墻嵌巖的情況下，基坑土方開挖實(shí)施過程中屢發(fā)承壓水突涌事故，導(dǎo)致無法正常開挖施工。首先，通過在坑外進(jìn)行抽水試驗(yàn)獲取場地的水文地質(zhì)參數(shù)，結(jié)合有限差分?jǐn)?shù)值模擬軟件，建立三維滲流模型，進(jìn)行基坑滲流場的模擬，預(yù)測基坑施工過程中的水位變化情況，與實(shí)際坑外降水水位變化進(jìn)行對比，驗(yàn)證三維滲流模擬計算的合理性與適用性。其次，基于三維滲流計算結(jié)果，采取坑內(nèi)外同時降水的方式將基坑外部承壓水水頭控制在開挖面以下，使得基坑順利實(shí)施。

［關(guān)鍵詞］超深基坑； 降水； 三維滲流模擬

中圖分類號： TU46+3 文獻(xiàn)標(biāo)識碼： A文章編號：  1002-848X(2016)S2-0560-04

Three dimensional seepage simulation of groundwater in the application of ultra-deep foundation pit in Maputo Bridge

Yang Yingyi1, Guo Changrui2, Liu Jiang2

(1 Shanghai Tongji Water Resources Technology Co., Ltd., Shanghai 200082, China;2 Road and Bridge International Co., Ltd., Beijing 100027, China) 

Abstract: Waterproof curtain combined with dewatering are the usual method at the engineering practice in solving the groundwater. The selection of hydrogeology parameters, the method of dewatering and the effects of the waterproof curtain are all very important. South anchorage foundation pit of Maputo bridge, Mozambique, 50m in diameter, depth more than 36m, used diaphragm wall as waterproof curtain, and the depth of the wall is 56m, which was rock-socketed. Groundwater inrushing happened several times, which caused unable to do normal construction of foundation pit. Firstly, hydrogeology parameters obtained from pumping tests outside of the pit, combined with the finite difference numerical simulation software, are used to establish the three dimensional seepage model, to predict water level changes during the construction process, compared with actual pit precipitation water level change, validate the rationality of the three dimensional seepage simulation and applicability. Secondly, based on the calculated results, dewatering outside the excavation was used to avoid the dangerous of the water inrushing.

Keywords: ultra-deep foundation pit; dewatering; three dimensional seepage simulation