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泥钙质胶结砾岩遇水后软化,力学性质会发生较大变化,其强度及刚度均大幅度降低;同时,软岩吸水后会膨胀。首先,通过试验研究泥钙质胶结砾岩在自由状态、受压状态下由于浸水而产生膨胀变形;然后,通过数值计算,分析几种拱坝运行期间可能出现的工况;最后,结合原型观测得出结论,在砾岩上修建结构物如拱坝时,除了要考虑岩体由于自重等因素产生的初始应力场外,还需根据实际情况,考虑浸水对砾岩力学性质的影响。
The calcareous cement conglomerate will soften when it encounters water and will change its mechanical properties greatly, its strength and stiffness will be greatly reduced. At the same time, the soft rock will swell after absorbing water. First of all, through the experimental study, the calcareous cementitious conglomerate is expanded and deformed under the condition of free state and pressure due to water immersion. Then, some possible operating conditions during the operation of the arch dam are analyzed by numerical calculation. Finally, It is concluded that when building structures such as arch dam on conglomerate, considering the initial stress field of rock mass due to self-weight and other factors, it is necessary to consider the influence of water immersion on the mechanical properties of conglomerate according to the actual situation.