地震折射波法研究坝基软岩特征
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摘要
坝基软岩具有遇水软化、膨胀,失水干裂解体的特征。采用小相遇地震折射波法既可以求解建基面岩体松动厚度,又可以揭示松动层和原岩的弹性力学特征,加之该法测试的数据能代表一定空间范围内岩体的平均动弹性性能,从而可系统揭示软岩的弹性力学特征。针对黄河沙坡头水电站坝基软岩介绍了小相遇地震折射波法的工作布置原则、测试时机、开挖方式和岩体地震波速度验收指标等。该物探测试方法不仅充分发挥了无损、快速、准确的优势,而且确保了施工进度和坝基岩体的验收质量。
The soft stratum of dam foundation has the feature of softening and expanding when meeting with water,and collapse after losing water.Applied the micro-seismic refraction method can not only solve the loose thickness of foundation rock surface,but also reveal the elastic and mechanical characteristics of the disturbed layer and the protolith.Because the data obtained from the testing can represent the average of the dynamic elastic properties within the scope of the rock mass,so the method is able to reveal systematically the elasticity mechanics features of soft rock.For Shapotou hydropower foundation soft rock,this paper introduced the micro-seismic refraction method,including the profile layout principle,the best testing time,excavation unloading and the longitudinal wave velocity acceptance index for foundation rock mass,and so on.The geophysical detection method could not only give full play to the advantage of the non-destructive,rapid and accurate,but also ensure the quality of the construction schedule and dam foundation rock mass acceptance.
The soft stratum of dam foundation has the feature of softening and expanding when meeting with water,and collapse after losing water.Applied the micro-seismic refraction method can not only solve the loose thickness of foundation rock surface,but also reveal the elastic and mechanical characteristics of the disturbed layer and the protolith.Because the data obtained from the testing can represent the average of the dynamic elastic properties within the scope of the rock mass,so the method is able to reveal systematically the elasticity mechanics features of soft rock.For Shapotou hydropower foundation soft rock,this paper introduced the micro-seismic refraction method,including the profile layout principle,the best testing time,excavation unloading and the longitudinal wave velocity acceptance index for foundation rock mass,and so on.The geophysical detection method could not only give full play to the advantage of the non-destructive,rapid and accurate,but also ensure the quality of the construction schedule and dam foundation rock mass acceptance.
引文
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[6]吴慧敏.结构混凝土现场检测技术[M].长沙:湖南大学出版社,1988.
[2]王波,袁景花,肖柏勋,等.DL/T5010—2005水电水利工程物探规程[S].北京:中国电力出版社,2005.
[3]中国水利电力物探科技信息网.工程物探手册[M].北京:中国水利水电出版社,2011.
[4]王清玉.岩体完整性系数的确定问题[J].勘察科学技术,1994(3):63-65.
[5]王清玉.应用弹性波法对岩体结构分类及有关问题解析[J].四川水力发电,1994(1):49-54.
[6]吴慧敏.结构混凝土现场检测技术[M].长沙:湖南大学出版社,1988.
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