Study on grouting mechanism of horizontal fractures considering the bleeding of cement slurry
WANG Xiaochen1，LIU Rentai1，YANG Weimin1，ZHANG Lianzhen2，GUO Yanxu1，XIN Dongdong3，BO Chunjie2
(1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；2. College of Pipeline and Civil Engineering，China University of Petroleum，Qingdao，Shandong 266580，China；3. Weifang High-tech Industrial Development Zone Construction Project Quality and Safety Supervision Station，Weifang，Shandong 261000，China)
Abstract：As a kind of suspension liquid，cement slurry has obvious characteristics of the bleeding. Once the bleeding occurs，the viscosity and the density of the slurry change obviously，which leads to the viscosity and the density of the slurry in time and space are not uniform at the penetration zone. In order to accurately describe the grouting process of the fracture under the function of the bleeding，a theoretical model of fracture grouting，considering the characteristic of cement bleeding，was established under the constant grouting rate，the expressions of the diffusion radius and the pressure gradient of slurry were derived，and a calculation method of fracture grouting considering the cement bleeding was put forward. Based on MATLAB programming，the distribution calculation of the bleeding rate and the grouting pressure in time and space was realized. The rationality of the theoretical model was verified by using the self-developed fracture grouting model test platform. The results show that the bleeding rate of the slurry shows a nonlinear change with the increase of the penetration length of the slurry. With increasing the water-cement ratio，the spatial distribution gap of the bleeding rate increases obviously. The grouting pressure calculated by considering cement bleeding is obviously higher than that of the unconsidered. With increasing the water-cement ratio of the slurry，the difference of the grouting pressure between two cases of considering and without considering cement bleeding rises. Comparison between the test results with the theoretical calculated values indicates that the grouting pressure obtained from the theoretical calculation is 1.2–1.5 times of the model test value. The established theoretical model can better describe the diffusion process of cement slurry in fracture grouting considering the effect of bleeding.
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2019, Vol. 38 
