A shoring system for trenches comprising large shoring panels and strutting assemblies is disclosed. Shoring panels are arranged in pairs against either wall of the trench and held vertically by adjacent strutting assemblies spaced apart along the trench. Each strutting assembly has at least one horizontal strut fastened in between a pair of opposite vertical struts. Each said vertical strut has laterally opposite guide channels to receive cooperatively the guide edge of the shoring panel that slides vertically within. Each guide channel of said vertical strut is provided with a locking bar to interlock the guide edge of the shoring panel so that pairs of shoring panels are linked successively on either side of a strutting assembly to create a shoring wall on either side of the entire trench. Said vertical strut is further provided with pairs of rollers to ease sliding of shoring panels. In one variation, the strutting assembly comprises at least one hydraulic cylinder to push apart opposite vertical struts forcing shoring panels to exert a pressure load against either wall of the trench.