膏浆平面裂隙动水注浆扩散模型研究

Paste slurry planar fracture dynamic water grouting diffusion model research

为探究膏浆平面大密度裂隙动水注浆扩散模型,首先以宾汉姆流体为研究对象,基于广义达西定律并运用相关力学理论,推导得出考虑膏浆自重的浆液扩散半径计算公式;其次,采用室内模型试验对浆液扩散半径计算公式进行验证,得出扩散半径试验值同理论公式计算值的误差小于10%。以地铁车站基坑堵漏工程为背景,根据浆液扩散半径计算公式,对不同参数进行单因素影响分析,结果表明,灌浆压力差、浆液屈服应力、裂隙半径对浆液扩散影响显著,扩散半径变化率大于60%;同时进行原位试验,对比得出扩散半径试验值同理论公式计算值误差小于10%。因此,在一定误差范围内,建立的扩散模型对平面大密度裂隙动水注浆工程具有指导意义。

In order to explore the diffusion model of paste slurry in great numbers of plane crack containing moving water,the formula of paste slurry diffusion radius was derived by taking Bingham fluid as the research object firstly.The formula was based on the generalized Darcy's law and the theory of mechanics,and could analyze the effect of self-gravity on diffusion radius of paste slurry.In addition,the laboratory model test was conducted to prove the formula,and the error between the test results and the theoretical calculated results was less than 10%.Then,the influences of different factors on diffusion radius were analyzed for the foundation pit leakage stoppage project of subway station.And the results showed that the effects of grouting pressure,slurry yield stress and fracture radius on slurry diffusion radius were significant and the changing rate of the diffusion radius was greater than 60%.At last,the field test was conducted,and the error between the field test results and the theoretical calculated results was less than 10%.Therefore,the diffusion model established in this paper was of great significance to grouting projects including great numbers of plane crack containing moving water.