剪切波速的试验研究及广义有效应力分析
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摘要
本文用摆动式传感器测定了两种膨胀土在不同含水量时的剪切波速， 并采用广义有效应力对试验结果作了分析和说明。研究揭示了剪切波速及最大剪切模量与广义有效应力之间的内在联系， 认为剪切波速和最大剪切模量由广义有效应力控制， 并将通常基于砂土和正常饱和固结土建立的剪切波速和最大剪切模量经验公式， 推广到非饱和土和结构性土。分析中还指出非饱和粘性土的剪切波速随含水量 （或饱和度） 的变化较大， 要分析土骨架的性状， 必须考虑剪切波速度的这种改变。由于剪切波速能够反映广义有效应力的大小， 可以成为广义有效应力测试的一种手段， 为广义有效应力理论的进一步研究提供了有利条件
In this paper, after the shear wave velocity of two expansive soils with varying water content are measured by bender elements, the test data are analyzed and explained by the use of G.E.S.The internal relation between generalized effective stress(G.E.S.) and shear wave velocity as well as the max shear modulus is revealed. It is concluded that both the velocity and modulus are under the control of G.E.S..And with G.E.S. adopted, experimental equations for shear wave velocity and max shear modulus of sandy soils and normally consolidated saturated soils are still valid for unsaturated and structural soils. It is also presented that shear wave velocity of unsaturated cohesive soils varies with its water content or saturation degree considerably, so the change of velocity must be taken into account when analysing the properties of soil skeleton. As shear wave velocity reflects the value of G.E.S., it can become a means for measuring G.E.S.,thus being of great help to the study of G.E.S.theory in the future.
In this paper, after the shear wave velocity of two expansive soils with varying water content are measured by bender elements, the test data are analyzed and explained by the use of G.E.S.The internal relation between generalized effective stress(G.E.S.) and shear wave velocity as well as the max shear modulus is revealed. It is concluded that both the velocity and modulus are under the control of G.E.S..And with G.E.S. adopted, experimental equations for shear wave velocity and max shear modulus of sandy soils and normally consolidated saturated soils are still valid for unsaturated and structural soils. It is also presented that shear wave velocity of unsaturated cohesive soils varies with its water content or saturation degree considerably, so the change of velocity must be taken into account when analysing the properties of soil skeleton. As shear wave velocity reflects the value of G.E.S., it can become a means for measuring G.E.S.,thus being of great help to the study of G.E.S.theory in the future.
引文
1 李启鹞. 黄土的动三轴和原位波速试验的性状. 第三届全国土动力学学术会议论文集. 同济大学出版社, 1990: 111～116
2 沈珠江. 广义吸力和非饱和土的统一变形理论. 岩土工程学报, 1996; 18 (2): 1～9
3 王正东. 浅层地震勘探应用技术. 地质出版社, 1988: 12～14
4 玉城逸夫. 地すべリ调查のための物理探查法, 1977
5 卢肇钧,吴肖茗,孙玉珍,尹 巍,冯 满.膨胀力在非饱和土强度理论中的作用.岩土工程学报,1997;19 (5): 20～27
2 沈珠江. 广义吸力和非饱和土的统一变形理论. 岩土工程学报, 1996; 18 (2): 1～9
3 王正东. 浅层地震勘探应用技术. 地质出版社, 1988: 12～14
4 玉城逸夫. 地すべリ调查のための物理探查法, 1977
5 卢肇钧,吴肖茗,孙玉珍,尹 巍,冯 满.膨胀力在非饱和土强度理论中的作用.岩土工程学报,1997;19 (5): 20～27
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