基于水下抽水试验的岩体渗透系数研究及应用

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Abstract Hydraulic boundary conditions of borehole pumping test for underwater rock mass are analyzed. Based on the principle of superposition of potential field，the conditions are divided into horizontal recharge condition and vertical recharge one. The theory of horizontal recharge is the same as that of land-based artesian water borehole pumping recharge. For the vertical recharge，the calculating formula for the borehole water flow is derived with some appropriate assumptions and simplifications；and the theoretical calculating formula is deduced and applied to obtain the permeability coefficient theoretical formula for underwater rock mass pumping test. Using this permeability coefficient calculated by the theoretical formula，the in-situ pumping tests for underwater rock mass are simulated by numerical methods. The calculating results are close to the test results. For the convenience of comparison，the permeability coefficient calculated by land-based formula is used to simulate the in-situ pumping tests. The calculating results show that compared with the permeability coefficient formula based on the land-based seepage theory，the permeability coefficient calculated by the theoretical formula is more reasonable，more realistic；and it can better reflect the seepage characteristics of underwater rock mass pumping test than those by land-based formula. Finally，according to the permeability coefficient calculated by the formula，the numerical method and empirical formula are used to predict the water inflow during constructions of a submarine tunnel. The results of water inflow obtained from the two methods are nearly the same，which can provide references to the selection of design plan and the construction of submarine tunnel.

Key words： rock mechanics underwater pumping test hydraulic boundary conditions permeability coefficient water inflow forecast

Received: 10 August 2009

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3542

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