樁基后壓漿對(duì)深基坑降水滲流場(chǎng)的影響
[Abstract]:Compared with the aquifer outside the pit, the permeability coefficient of the aquifer in the area of foundation pit decreases after the grouting of the bored pile, which has obvious influence on the seepage field of the foundation pit. A square building is composed of five towers and underground garages. The pile side grouting bored pile is used. The excavation depth of foundation pit is 21m, the confined aquifer group is 10m thick, the permeability is strong, and the open intact well dewatering is adopted. Well location is mainly arranged along the perimeter of foundation pit. After the hydrogeological conditions are generalized, a three-dimensional unsteady flow numerical model of groundwater is established, and the heterogeneous seepage field is simulated and compared with the homogeneous seepage field. The results show that the hydraulic gradient in the pit becomes steeper and the water inflow of a single well decreases and the number of wells increases when the permeability coefficient of the post-grouting area in the pit decreases. If the calculation field of the model is considered according to the permeability coefficient after grouting, the recharge intensity will be seriously reduced and the total discharge of foundation pit will be underestimated. Under the same depth reduction requirement, the permeability coefficient after grouting in the pit decreases, but the permeability coefficient outside the pit remains unchanged, and the total foundation pit supply is basically unchanged. The results of field monitoring and simulation are consistent. The research results can be used for reference for groundwater control in similar projects.
【作者單位】: 上海廣聯(lián)環(huán)境巖土工程股份有限公司環(huán)境巖土技術(shù)中心;上海市基坑工程環(huán)境安全控制工程技術(shù)研究中心;
【基金】:上海市科學(xué)技術(shù)委員會(huì)(12231200702,13231201004,14DZ1207802)資助
【分類號(hào)】:TU463
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