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土体小应变剪切模量在基坑、隧道等地下工程的计算分析中有着重要作用,越来越受到人们的关注。虽然上海地区地下工程项目的建设规模不断扩大,但关于上海典型黏土层的小应变剪切模量的研究相对较少。分别采用现场波速测试和室内弯曲元试验对上海典型黏土层的初始剪切模量进行了研究。试验结果表明:在减小土样扰动、保持土样应力状态与原位土体等效的基础上,弯曲元试验得到的初始剪切模量与现场波速测试相一致;考虑了土体应力状态和孔隙比的经验公式能够合理地描述上海典型黏土层初始剪切模量的变化规律,并给出了各土层的经验参数。试验结果可为上海地区地下工程计算分析中小应变剪切模量的估算提供参考。
Soil small strain shear modulus plays an important role in the calculation and analysis of underground engineering such as foundation pit and tunnel, and attracts more and more people’s attention. Although the construction scale of underground engineering projects in Shanghai is constantly expanding, there are relatively few studies on the small strain shear modulus of the typical clay layer in Shanghai. The initial shear modulus of a typical clay layer in Shanghai was studied by field wave velocity test and indoor bending element test respectively. The experimental results show that the initial shear modulus obtained by the bending element test is consistent with the on-site wave velocity test on the basis of reducing the disturbance of soil sample, keeping the soil sample stress state equivalent to the soil sample in situ and considering the stress state of soil And the empirical formula of void ratio can reasonably describe the variation law of the initial shear modulus of the typical clay layer in Shanghai and give the empirical parameters of each soil layer. The test results can provide reference for the estimation of shear modulus of small strain in the calculation and analysis of underground engineering in Shanghai area.