岩体结构面测试(中文).docVIP

北京晓幼营板理化岩体结构面强度的原位测试 李元霞1，孙进忠1*，杜明性1，田爱苹2，郑卫锋3 1 中国地质大学（北京），北京 100083 2 天津大学，天津 300072 3 国家电力科学研究院岩土工程研究所，北京 102400 摘要：岩体强度很大程度上取决于结构面的强度，板理化岩体尤其如此。通过原位测试直接获得岩体结构面的强度参数对于岩体稳定性分析和工程设计都具有重要意义。为了解板理化岩体板理结构面的强度性质，选择北京房山区晓幼营白云质板理化岩体进行了结构面强度的原位测试研究。鉴于传统岩体原位直剪试验成本高和操作难的情况，我们在试验中考虑岩体中板理结构面的产状，通过开挖不同方向、不同解离状态的试体调整试验荷载的作用方向，在掌握北京地区构造应力资料的基础上，利用区域构造应力场提供法向压力，免除了笨重的反力装置，取得了一定的实验效果，确定了被测岩体结构面的强度参数：粘聚力c和摩擦角(，对原位岩体结构面强度测试方法进行了一次有益的尝试。 关键词：板理化岩体，结构面强度，原位测试，正应力，剪应力，构造应力 Test in situ for the strength of structure plane in platy rock mass at Xiaoyouying, Beijing LI Yuanxia1, SUN Jinzhong1*, DU Mingxing1, TIAN Aiping2, ZHENG Weifeng3 1 China University of Geosciences, Beijing 100083, China 2 Tianjin University, Tianjin 300072, China 3 China Electric Power Research Institute, Beijing 102400, China Abstract: Strength of rock mass is largely determined by the strength of structure planes in the rock mass, and this is especially true to platy rock mass. It is significant to get the strength parameters of structure planes in the rock mass directly by test in situ both for the stability analysis of rock mass and for engineering design. In order to understand the strength property of platy rock mass, test in situ for the strength of the structure plane in dolomite platy rock mass at Xiaoyouying in Fangshan District of Beijing is carried out. Traditional test in situ will result in a high cost, and bring more difficulties for the shear strength of rock mass. To get rid of the heavy reaction frame, relative to the attitude of plates in the rock mass, local tectonic stress is utilized to offer the normal pressure on the preconcerted shear plane of the test rock block. The value of the normal pressure applied on the shear plane and the direction of the test load acted on the test block can be adjusted by open orientation and disconnection state of the test block. By means of the test method explained above, and based on the data of the local tectonic stress in Beijing territory, a pretty good res