地下工程防水设计方案的确定和防木材料的选择地下工程的防水设防应全面考虑地形、地貌、水文地质、工程地质、地震烈度、冻结深度、环填条件、结构形式等因素，按国护结构允许渗漏水量的程度来确定设计方案和选择防水材料。
1、对于没有自流排水条件而处于饱和土层或岩层中的地下工程,可采用补偿收缩混凝土结构自防水,或钢、铸铁管筒或管片或设置附加防水层、采用注浆或其它防水措施。
For there is no gravity drainage conditions in the saturated soil or rock in underground engineering, can compensate for shrinkage of concrete structural waterproof, or steel, cast iron tube or pipe piece or set additional waterproof layer, using grouting or other waterproofing measures.
2、对于没有自流排水条件而处于非饱和土层或岩层中的地下工程,可采用防水混凝土结构自防水、补偿收缩混凝土结构自防水、普通混凝土结构或砌体结构或设置附加防水层、采用注浆或其它防水措施。
For there is no gravity drainage conditions in the unsaturated soil or rock in underground engineering, can be waterproof concrete structural waterproof, shrinkage-compensating concrete structural waterproof, ordinary concrete structures or masonry structure or set additional waterproof layer, using grouting or other waterproofing measures.
3、对于有自流排水条件的地下工程,可采用防水混凝土结构自防水、补偿收缩渥凝土结构自水、普通混凝土结构、砌体结构或铺喷支护，或采取附加防水层、衬套、注浆或其它防水措施。
For gravity drainage conditions of underground works, can be waterproof concrete structural waterproof, Ottawa shrinkage-compensating concrete structures from water, ordinary concrete structures,masonry structures or paved shotcrete support, or to take an additional waterproof layer, bushings, grouting or other waterproofing measures.
4、对于处在侵蚀性介质中的地下工程,应采用耐侵蚀的防水砂浆、混凝土、卷材或涂料等防水材料作防水层。对于受动力设备或发电设备拨动作用的地下工程,应采用合成高分子防水卷材或合成高分子防水涂料等具有良好延伸性和柔韧性的防水材料作防水层。
For aggressive media in the underground works, should be resistant to erosion waterproof mortar, concrete, and other waterproof membrane or coating materials for the waterproof layer. Or by power equipment for power generation equipment underground engineering toggle action should be used synthetic polymer waterproofing membrane or synthetic polymer waterproof coating has good extensibility and flexibility of waterproof material for waterproof layer.
5、对处于冻土层中的工程,当采用混凝土结构时,其混凝土抗冻融循环不得小于100次。具有自班排水条件的工程,应设置自流排水系统，无自流排水条件、有掺漏水或需应急排水的工程,应设机械排水系统。
In the permafrost layer on the project, when using the concrete structure, the concrete resistance to freeze-thaw cycles of not less than 100 times. With self-class engineering and drainage conditions, gravity drainage system should be set up, no gravity drainage conditions, there are mixed leaking or need emergency drainage works, mechanical drainage system should be set up.
