Clays　are　widely　used　in　geotechnical　and　geoenvironmental　engineering　applications　and　it　is　crucial　to　understand　its　behaviour　for　the　dynamic　field　conditions.　The　presence　of　a　temperature　gradient　across　clayey　soils　that　exhibit　semi-permeable　membrane　(or　osmotic)　behaviour　may　promote　a　number　of　complex　processes,　including　thermal　expansion　or　consolidation,　thermally　induced　osmosis,　thermal　diffusion,　along　with　other　flow　and　deformation　processes.　Chemical-osmosis　and　chemico-osmotic　consolidation　that　are　significant　in　isothermal　conditions　are　also　affected　by　temperature.　Publications　on　chemical-osmosis,　and　to　some　extent　thermo-osmosis　behaviour　of　semi-permeable　clays　under　coupled　conditions　are　widely　available.　However,　studies　that　include　the　influence　of　both　thermo-osmosis　and　chemical-osmosis　together　are　rare.　In　this　paper,　a　fully　coupled　numerical　model　is　presented　to　study　the　effects　of　both　osmotic　processes　on　thermo-hydromechanical-chemical　behaviour　of　semi-permeable　clays.　Solute　spread　in　a　landfill　clay　liner　is　investigated　under　the　combined　influence　of　mechanical,　thermal,　and　chemical　loading.　Model　results　show　that　the　clay　deformation　is　sensitive　to　thermo-osmosis;　and　the　effects　of　thermo-osmotic　consolidation,　excess　pore　water　dissipation,　and　the　overall　settlement　increases　with　temperature.　Variation　of　the　source　temperature　from　40　degrees　C　to　80　degrees　C　yielded　an　increase　of　11.3%　of　the　peak　soil　settlement.　Significant　contribution　of　thermoosmosis　on　solute　transport　is　noticed　in　this　study　and　ignoring　the　process　substantially　deviate　from　the　realism.　Up　to　80%　overprediction　of　cadmium　spread　is　observed　in　the　clay　liner　when　the　thermo-osmotic　processes　are　neglected.