Slide stability of hydraulic structures on subbed soil

The study on slide stability of hydraulic structures on subbed soil was made. Using the slide test results of dragged concreting base plates on subbed soil pits,the decreased value of bearing capacity on slide after rebound and repression influence of subbed soil was determined,and the envelope of ultimate slide shear resistance was also quantitatively determined. Due to the lack of similar mechanisms of slide stability on subbed soil and base plate of hydraulic structures,different safety coefficients for the slide stability were adopted. It was suggested to use the maximum compressive stress σmaxof eccentric load to predict structure displacement,slide and creepy slippage of subbed soil,to determine the sliding creepy contour and limit the maximum load on subbed soil. Two hydraulic structures that had been put into operation were reviewed by this method,and the results accorded with the real conditions.

崇遵高速三合头滑坡综合治理研究

分析了滑坡成因,并对其稳定性进行了评价。融深层侧向位移监测于工程地质勘察,明确了滑坡的主滑方向,准确定位了主滑动面。现场取样,经土工试验,确定了滑带土的密度ρ、内聚力c的取值。通过反分析法,在安全系数k=0.95的条件下,反算内摩擦角φ的取值。根据滑坡剩余下滑力的大小,创造性地建立了h型抗滑桩模型,对滑坡进行分区综合治理,并取得了良好的效果。该滑坡的成功治理方案,为治理大推力滑坡提供了宝贵的借鉴。

地基土上水工建筑物的抗滑动稳定研究

研究地基土上水工建筑物滑动设计和计算中存在的问题。利用基坑内压板抗滑动试验成果,确定地基土包括回弹影响后的抗滑动承载能力。采用地基土承受偏心荷载的最大压应力σmax控制地基土与压板的位移和抗滑动形式,可以发生不同的3种最大位移面,形成6种抗滑动形式。根据地基土承受的最大压应力,提出设计抗滑动的计算方法:定量确定地基土与压板抗滑动的摩擦系数计算值,地基土的抗滑动安全系数由指标安全系数控制,修正在地基土上建筑物整体滑动的计算公式,计算预测可能发生的多种最大位移面和抗滑动形式及绘制地基土滑动区轮廓,限定地基土发生平面抗滑动形式时承受的最大压应力值。按拟定方法,回顾分析3座已建水工建筑物,分析计算成果符合实物工况。

地基土上水工建筑物的抗滑动稳定研究(续)

研究地基土上水工建筑物抗滑稳定中存在的问题。利用在基坑内压板抗滑动试验成果,确定地基土回弹影响后的抗滑承载能力降低数值,定量确定地基土抗滑剪应力包线和抗滑摩擦系数;提出采用地基土承受偏心荷载的最大压应力σmax预测建筑物位移、滑动和地基土蠕变滑动的设计方法;确定地基土蠕变滑动轮廓;限定地基土的最大压应力等。按拟定方法回顾计算两座已建水工建筑物,成果符合实物工况。