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變坡面淺埋偏壓小凈距隧道圍巖壓力計算方法

Calculation Method of Surrounding Rock Pressure of Variable Slope Surface Shallow Buried Bias and Small Clear Distance Tunnel

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陳家征1 , 2, 李忠1 , 2, 韓煬1 , 2, 袁文佳1 , 2

( 1 . 石家莊鐵道大學(xué) 土木學(xué)院，河北石家莊 050043 ;

2. 道路與鐵道工程安全保障省部共建教育部重點實驗室，河北石家莊 050043)

摘要：為研究在考慮黏聚力和內(nèi)摩擦角作用下對變坡面淺埋偏壓小凈距隧道圍巖壓力的影響，本文利用極限平衡法來求解變坡面淺埋偏壓小凈距隧道深、淺埋側(cè)側(cè)壓力系數(shù)、圍巖拱頂垂直壓力和圍巖兩側(cè)水平壓力，推導(dǎo)出考慮黏聚力和內(nèi)摩擦角的圍巖壓力計算方法，通過簡單算例與已有規(guī)范公式和既有文獻進行對比，驗證本文公式的合理性，并探討了深埋側(cè)隧道水平側(cè)壓力系數(shù)影響因素。結(jié)果表明：水平側(cè)壓力系數(shù)隨坡角的增加而逐漸增大，隨夾角的增加而呈現(xiàn)不同的變化趨勢，隨黏聚力和內(nèi)摩擦角的增加而逐漸減小，隨埋深的增加而逐漸增加。在考慮黏聚力和內(nèi)摩擦角的作用下，本文公式有利于考慮降雨等環(huán)境因素引起的巖土體力學(xué)參數(shù)的變化帶來的對圍巖不利影響，可為類似變坡面淺埋偏壓小凈距隧道結(jié)構(gòu)設(shè)計和支護參數(shù)優(yōu)化提供理論依據(jù)。

關(guān)鍵詞：小凈距隧道；淺埋偏壓；變坡面；黏聚力；內(nèi)摩擦角；圍巖壓力

中圖分類號：U451 . 2

文獻標(biāo)志碼：A

文章編號：1005- 8249 (2024) 03- 0054-07

DOI：10. 19860/j.cnki.issn1005 - 8249.2024.03 .012

CHEN Jiazheng1 , 2, LI Zhong1 , 2 , HAN Yang1 , 2 , YUAN Wenjia1 , 2

1. School of Civil Engineering , Shijiazhuang Tiedao University , Shijiazhuang 050043 , China;

2. The Ministry of Education jointly established the Key Laboratory of Road and Railway Engineering Safety and Security , Shijiazhuang 050043 , China

Abstract : In order to study the influence of cohesion and internal friction angle on the pressure of the surrounding rock of the shallow buried bias and small clearance tunnel of variable slope surface , the limit equilibrium method is used to solve the problem of shallow buried bias and small clear distance tunnel depth , shallow buried side pressure coefficient , The vertical pressure of the surrounding rock vault and the horizontal pressure on both sides of the surrounding rock are deduced , and the calculation method of the surrounding rock pressure considering the cohesion and internal friction angle is derived , and the rationality of the formula is verified by a simple example compared with the existing standard formula and the existing literature , and the influencing factors of the horizontal lateral pressure coefficient of the deep buried tunnel are discussed. The results show that the horizontal lateral pressure coefficient increases gradually with the increase of slope angle , shows different trends with the increase of the included angle , decreases with the increase of cohesion and internal friction angle , and gradually increases with the increase of burial depth. Considering the action of cohesion and internal friction angle , the formula proposed in this paper is conducive to considering the adverse effects of the changes in the mechanical parameters of the rock and soil bodies caused by rainfall and other environmental factors on the surrounding rock , which can provide a theoretical basis for the structural design and optimization of supporting parameters of the shallow buried bias and small clearance tunnel with similar variable slope surface.

Keywords : cohesion; internal friction angle; variable slope surface; small clear distance; shallow buried unsymmetrical tunnel; surrounding rock pressure

作者簡介：陳家征 (1998—) , 男，碩士，研究方向：地質(zhì)災(zāi)害超前預(yù)報及隧道地下工程。

收稿日期：2023- 10- 24