The geological problems of development and utilization of underground space resources in Beijing are state of storing of groundwater,the changing of groundwater level,ground subsidence,active fault,covered karst collapse and the underground noxious gas.
北京平原地下空间资源开发利用的地质问题主要有地下水的赋存状态、地下水位的变化、地面沉降、活动断裂、隐伏岩溶塌陷、地下有害气体等等。
参考来源 - 北京市地下空间资源开发利用规划的地质问题·2,447,543篇论文数据，部分数据来源于NoteExpress
The thesis demonstrates the feasibility of natural ventilation to control concentration of noxious gas in the sewer tunnel.
并论证利用自然风稀释污水隧道内有害气体浓度的理论可行性。
The utility model can not only prevent the dust and noxious gas in the air from entering the water box but also purify the water quality with an excellent effect.
本实用新型既可以防止空气中的灰尘、有害气体等进入水箱，又能很好地净化水质。
The positive effect of the utility model is to dissolute the waste rubber in comparatively low temperature without making noxious gas and with high recovery ratio and high automation.
本实用新型产生的有益效果是，将废旧橡胶在较低温度下进行分解，不产生有毒气体，回收利用率高，自动化程度高。
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