黄壁庄水库副坝塌坝原因的同位素方法研究

Study on collapse sink of Huangbizhuang secondary dam with isotope method

通过钻孔中进行的密度测定、人工同位素示踪、环境同位素分析等方法与技术,分析了黄壁庄水库副坝在进行混凝土连续墙施工过程中多次发生塌坑、塌坝的原因为:塌坝段下部的硅质灰岩中溶洞发育,充填物很少,上部地层多次的塌方使已固结的土体遭到严重的破坏,在护壁泥浆的长期浸泡下形成软塑状土.在重型机械的压力下,软塑状土从槽孔向溶洞中流动,造成严重的塌坑事故.

Based on the methods of density measurement, artificial isotope tracking, and environmental isotopic analysis in boreholes, the causes of collapse sink, which occurred many times during the construction of the continuous concrete wall for the Huangbizhuang secondary dam were analyzed as follows: the solution caverns in silicon sandstones developed under the collapse section of the dam; with little material filling in the caverns, many times of upper stratum collapses resulted in serious damage to consolidated soil mass of the caverns, which converted into weak soil after a long-term soaking in the wall protective slurry; the movement of slots in weak soil toward the caverns under the pressure of heavy machines caused the serious collapse sink.