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href="/protype108075.html" target="_blank"><strong>工程降水</strong></a>。降低地下水位的方法一般可分为集水坑降水和井口<a href="/product802306.html" target="_blank"><strong>工程降水</strong></a>两大类ã€?/p><p>  当地下水位高于基坑开挖面时,必须采用降低地下水位的方法将坑内土层中的水排出。降水可以增加坑内土体的强度,有利于控制基坑围护结构的变形。在软土地区,当基坑开挖深度超è¿?m时,一般需要进行井点工程降水。当开挖深度较浅时,开挖时还可利用排水沟和集水井进行集水和明沟排水ã€?/p><p>  当基坑底部为隔水层且坑底有承压水时,应进行坑底突涌验算。必要时可采取水平封底防渗或钻孔减压措施,保证坑底土层的稳定。当坑底承压水层以上土体的压力重量不足以抵抗承压水头时,应布置减压井降低承压水头压力,防止承压水涌动,确保基坑开挖安全ã€?/p><p>  当降水危及基坑及周围环境安全时,应采用停水或回注的方法ã€?/p><p>  一、集水坑沉淀</p><p>  明渠集水井工程降水具有施工方便、造价低廉的特点,在施工现场应用为广泛。在高水位地区的基坑边坡支护工程中,该方法常作为其他工程降水方法的辅助排水措施。主要排除地下潜水、施工用水和天上雨水。在地下水储量较小、地质条件较好的情况下,可利用明渠和集水井排除基坑内的积水。但在地下水丰富的地区,如果只采用这种方法降水,由于基坑边坡渗水较多,工作面泥泞,对构筑物施工不利。因此,这种工程降水方法一般不单独用于高水位地区的基坑边坡支护,通常与降水井点或截水幕墙配合使用ã€?/p><p>  二、截水幕å¢?/p><p>  截水幕墙不能单独作为工程降水方案,一般与明渠或井点降水配合使用。截水幕墙一般用于地下水非常丰富,地下水补给非常快,或者需要控制边坡失稳和周围建筑物不均匀沉降的场合。常见的有防渗墙、帷幕灌浆、钢板桩等。既切断了地下水向基坑的渗透,又对基坑边坡起到了支撑作用。同时,由于截水幕墙的存在,大大降低了基坑降水对幕墙外地下水的影响,有效保证了周边建筑物的稳定性。当然,隔断幕墙的施工需要较大的场地,会产生较大的噪音,所以在建筑密集区和居民区附近施工时会受到限制ã€?/p><p>  三。轻型井ç‚?/p><p>  轻型井点工程降水是我国广泛采用的一种降水方法。与其他井点系统相比,更简单、快捷、经济、安全,特别适用于降水面积小、地下水储量小的情况。这种方法一般将水位深度降低3 ~ 3 ~ 6m。轻型井点适用的土壤渗透系数为0.1 ~ 50m/d,当土壤渗透系数较小时,需要在井点管顶部用粘土密封填充,以保证井点系统连接部位具有良好的气密性,提高整个井点系统的真空度,增强抽排水能力ã€?/p><p>四。管井井ç‚?/p><p>  井位适用于渗透系数高的砾石地层、地下水丰富的地层以及轻型井位难以解决的场合。具有施工简单,出水量大的特点。每口管井出水量可达50 ~ 100 m3/h,可降低地下水位深度çº? ~ 5m。这种方法一般用于潜水层降水,当土壤的渗透系数在20 ~ 200 m/d范围内时效果佳ã€?/p><p> 五。喷射井ç‚?/p><p>  注水井点的抽水系统和管件复杂,故障率比较高,能量损失大。与其他井点工程降水方法相比,具有降水深度大、运行费用高等特点。喷射井点系统可在井点底部产ç”?50毫米汞柱的真空,其下降水位深度一般在8 ~ 8 ~ 20m之间,适用的土壤渗透系数与轻型井点相同,一般为0.1 ~ 50m/d</p><p>  六。不及物动词电渗井点</p><p>  电渗点适用于渗透系数较小的地质条件,如渗透系数小äº?.1m/d的粘土、亚粘土、淤泥、淤泥质粘土等,需配合轻型井点或喷射井点使用。在沉淀过程中,需要对电压、电流密度和功耗进行测量,并根据需要进行调整,工作比较繁琐ã€?/p><p>  七、深井井ç‚?/p><p>  深井井点工程降水是基坑支护中广泛采用的一种降水方法,具有排水量大、降水深度大、降水范围大等优点。深井井点适宜的土壤渗透系数为10 ~ 250 m/d,降水位深度超过15m,常用于降承压水。利用深井井点降低承压水位,有助于缓解压力,保证基坑安全。但由于降水深、出水量大、水位降落曲线陡,势必造成降水的影响范围和程度大,从而容易造成基坑周边建筑物的不均匀沉降ã€?/p><p><img src="/img.ashx?shopid=20167&file=2022042110473089.jpg" data-filename="img" style="max-width: 100%; width: 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