Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Twelve experiments were conducted to investigate the factors affecting the self‐healing of the crack in the clay seepage barrier. The factors include the depth of crack, the grain size of base soils and the gain size of filter soils. Four crack types with different depths, five base soils and five filter soils with different grain size curves were considered. The tested soils were designed according to the empirical criterion { 0.2 mm ≤ D15 ≤ 9d85 }. During the experiments, the variations of the flow rate with the elapsed time were observed. The experimental results indicate that the self‐healing of the crack in the base soil layer of the sample is induced during testing under water pressure 300 kPa. The crack after self‐healing may not be fractured again while the water pressure is increased from 300 kPa to 400 kPa then to 500 kPa. The critical flow rate at which the self‐healing of the crack starts is increasing with the increase of the crack depth or/and the value of D15/d85. The mechanism of the self‐healing of the crack may include piping, erosion of channel, clogging of channel, redeposit in filter, and swelling of expandable mineral particles. For the present experiments, the accumulation of the transported particles at the outflow filter, and the clogging of the inflow part of the outflow filter may be the main reason why a reduced percolation rate is observed.
Twelve experiments were conducted to investigate the factors affecting the self‐healing of the crack in the clay seepage barrier. The factors include the depth of crack, the grain size of base soils and the gain size of filter soils. Four crack types with different depths, five base soils and five filter soils with different grain size curves were considered. The tested soils were designed according to the empirical criterion { 0.2 mm ≤ D15 ≤ 9d85 }. During the experiments, the variations of the flow rate with the elapsed time were observed. The experimental results indicate that the self‐healing of the crack in the base soil layer of the sample is induced during testing under water pressure 300 kPa. The crack after self‐healing may not be fractured again while the water pressure is increased from 300 kPa to 400 kPa then to 500 kPa. The critical flow rate at which the self‐healing of the crack starts is increasing with the increase of the crack depth or/and the value of D15/d85. The mechanism of the self‐healing of the crack may include piping, erosion of channel, clogging of channel, redeposit in filter, and swelling of expandable mineral particles. For the present experiments, the accumulation of the transported particles at the outflow filter, and the clogging of the inflow part of the outflow filter may be the main reason why a reduced percolation rate is observed.
Self‐Healing of a Core Crack
Wang, Jun‐Jie (Autor:in)
10.03.2014
16 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
MICROORGANISM FOR NATURAL CRACK HEALING AND SELF-HEALING CRACK HEALING AGENT USING THE SAME
| Europäisches Patentamt | 2024