锦屏电站深埋隧洞大理岩卸荷力学特性试验研究

›› 2006, Vol. 27 ›› Issue (S1): 487-492.

锦屏电站深埋隧洞大理岩卸荷力学特性试验研究

朱珍德¹，王战鹏²，朱明礼¹

1. 河海大学岩土工程研究所，南京 210098；2. 深圳市岩土工程公司，深圳 518028

收稿日期:2006-06-25 发布日期:2006-12-15
作者简介:朱珍德，男，1964年生，博士，教授，博士生导师，主要从事岩石力学与工程的教学、科研工作。
基金资助:
国家自然科学基金委员会、二滩水电开发有限公司砻江水电开发联合研究基金项目（No.50539090）与国家自然科学基金项目（No.50479021）。

Study of mechanical performance of marble comes from immerged seepage tunnel of Jinping Water Power Station

ZHU Zhen-de¹, WANG Zhan-peng², ZHU Ming-li¹

1.Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China; 2. Company of Geotechnical Engineering, Shenzhen 518028, China

Received:2006-06-25 Published:2006-12-15

摘要/Abstract

摘要： 利用MTS 815.04电液压伺服可控制刚性试验机，对取自四川凉山雅砻江大河湾锦屏二级水电站的大理岩试样进行了不同方式的卸荷试验。试验结果表明：在保持主应力差不变的卸荷试验中，随着围压降低，轴向应变先降低后又增大，而弹性模量先增大，后又突然降低；在保持轴向位移不变的卸荷试验中，随着围压的降低，试样的弹性模量先增大，达到峰值后开始降低，而轴向应力则不断降低；在保持主应力和不变的卸荷试验中得到泊松比大于由常规三轴试验得到的泊松比，但两者的强度值相差不大。

关键词: 卸荷试验, 大理岩, 卸荷特性, 卸荷方式

Abstract: In order to research the unloading property of the marble in the course of excavation, the different modes of the unloading experiments on marble which are come from the seepage tunnel of Liangshan Yalongjiang Dahewan Jinping Water Power Station in Sichuan Province have been done by hydraulic pressure servo rigidity rock mechanics experiment system MTS815.04. The results of the experiments show that: on condition of keeping the principal stress difference invariant, when the confining pressure decrease, the axial strain will increase after decrease, but the elastic modulus first increase before decrease; on condition of keeping the axial displacement invariant, when the confining pressure decrease, the elastic modulus of the samples first increase, then decrease after reaching the peak value; but the axial stress is always decreasing; the Poisson's ratio obtained from the unloading experiments on condition of keeping the principal stress sum invariant is greater than that obtained from the routine triaxial test; but the marble strengths obtained from two experiments haven’t a clear distinctness.

Key words: unloading experiments, marble, unloading performance, unloading manner

中图分类号:

TU 45

朱珍德，王战鹏，朱明礼,. 锦屏电站深埋隧洞大理岩卸荷力学特性试验研究[J]. , 2006, 27(S1): 487-492.

ZHU Zhen-de , WANG Zhan-peng , ZHU Ming-li,. Study of mechanical performance of marble comes from immerged seepage tunnel of Jinping Water Power Station [J]. , 2006, 27(S1): 487-492.

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